Condition Analysis
AI-powered assessment using site data and 14-day weather history
Trollers Gill has received frequent rain over recent weeks (85.5mm in 28 days) with rain today (2.1mm) and more forecast tomorrow and the day after. The enclosed gorge will be holding significant moisture, and limestone surfaces will be greasy and dangerous.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The enclosed gorge acts as a moisture trap — sheltered from wind with minimal direct sun beyond early morning — meaning seepage and damp conditions persist far longer than at open limestone venues.
- The glacially polished, smooth limestone surfaces become exceptionally slippery when damp, and the sustained technical nature of routes (blank walls, slim grooves) leaves little margin for reduced friction.
- The gorge floor is likely very wet given the cumulative 85.5mm over 28 days, and pockets and tufa features throughout the gill will be holding water from recent repeated rainfall events.
- At 300m altitude with overnight temperatures dropping near freezing, any residual moisture in cracks and pockets may partially freeze overnight and thaw during the day, keeping surfaces persistently damp.
Warnings
3
- Polished limestone in the enclosed gorge will be extremely greasy — falls are likely on technical routes even if rock appears superficially dry.
- The gorge floor and approach path will be wet and slippery; take care on the walk-in.
- Check BMC RAD for bird nesting restrictions — peregrine and raven nesting season is active (February–June) and restrictions may apply at Trollers Gill.
Reasoning
With 2.1mm today, 2.5mm yesterday, 5.7mm on the 11th, and 85.5mm over 28 days, the enclosed gorge will have saturated walls with active seepage lines and standing water in pockets.
The sheltered east-facing gorge receives only morning sun and is shielded from the prevailing westerly winds, meaning almost no effective drying has occurred during the brief dry spells between repeated rain events.
Limestone does not suffer structural weakening when wet, but the smooth glacially-polished surfaces lose friction dramatically, making technical climbing extremely hazardous.
Early April in the Yorkshire Dales at 300m is still a marginal season — cool temperatures (averaging 7.3°C), high humidity (77% average), and short effective drying windows mean the gorge struggles to dry out between frontal systems.
Contributing Factors
6
2.1mm today following 2.5mm yesterday and 5.7mm two days ago means the rock has had zero consecutive dry days and surfaces will be actively wet.
85.5mm over 28 days with rain on most days has saturated the gorge environment, promoting persistent seepage through the limestone.
The narrow gorge traps humidity and blocks wind, dramatically slowing any surface drying even during brief dry windows.
Humidity averaging 77% over the past week with 78% today means even surfaces not directly rained on will feel greasy on the polished limestone.
Average temperatures of 7.3°C over the past week provide minimal evaporative drying potential, especially within the shaded gorge.
7.3mm forecast for tomorrow followed by 6.0mm the day after means conditions will worsen before any meaningful drying window arrives.
Recommendations
3
- Do not visit Trollers Gill today — the gorge will be wet, greasy, and dangerous on the polished limestone.
- The earliest realistic window is April 17th after two days of drying, but even then assess conditions carefully on arrival given the sheltered gorge environment.
- If you need to climb this week, consider an open, south-facing, wind-exposed limestone venue instead — Kilnsey or Malham's steeper sections may dry faster.
Previous Analyses
Do Not Climb
70%
2 days ago
Trollers Gill has received frequent rain over the past two weeks including 5.7mm yesterday and 1.9mm today, with zero consecutive dry days. The enclosed gorge will be holding moisture from this sustained wet period, and limestone friction will be poor in these damp, humid conditions.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The enclosed gorge traps humidity and blocks wind, meaning surface moisture from today's and yesterday's rain will linger far longer than at an open crag — expect damp holds well into tomorrow.
- Seepage lines on the gorge walls are likely active given 91.5mm of rain in the past 28 days; pockets and tufa features will be holding water even where surfaces appear dry.
- The east-facing aspect only receives morning sun, which at this time of year provides limited drying energy — afternoon shade keeps the gorge cool and damp.
- The glacially polished limestone becomes exceptionally greasy when damp; even residual humidity on the smooth, curved walls dramatically reduces friction on the technical slab and wall climbing that dominates here.
Warnings
2
- Active seepage is likely on many routes given the sustained wet period — falling on greasy polished limestone carries serious injury risk.
- Do not rely on the rock appearing dry from a distance; limestone can feel greasy from humidity alone, especially in the enclosed gorge microclimate.
Reasoning
With 1.9mm today, 5.7mm yesterday, and 91.5mm over the past 28 days, the gorge walls and features are almost certainly damp with active seepage in places.
Zero consecutive dry days, sheltered aspect, and only morning sun mean effective drying has been minimal — the enclosed gorge severely limits airflow that would otherwise aid evaporation.
Limestone does not suffer structural weakening when wet, so there is no rock conservation concern, but greasy holds pose a significant fall risk on technical routes.
Early April in the Yorkshire Dales at 300m is still cool (average 7.3°C last week) with limited solar drying potential; spring conditions remain marginal for an enclosed gorge venue.
Contributing Factors
7
1.9mm today following 5.7mm yesterday means the rock surface is currently wet or very damp with no drying window.
91.5mm over 28 days with only brief dry spells has saturated the gorge environment and activated seepage lines.
The narrow gorge blocks wind and traps humidity, dramatically slowing surface drying compared to open crags.
Limited solar exposure at this time of year provides insufficient warmth to drive evaporation from the shaded gorge walls.
High ambient humidity prevents effective evaporation and keeps limestone surfaces greasy even where not directly wet.
Average 7.3°C over the past week limits evaporation rates, and overnight near-frost temperatures contribute nothing to drying.
Polished limestone becomes extremely slippery with even slight moisture, and the technical nature of routes here demands good friction.
Recommendations
3
- Wait for at least two consecutive dry days with humidity below 75% before visiting — the gorge needs extended drying time.
- If you do visit after a dry spell, test friction on lower holds before committing to routes; the polished limestone will reveal dampness quickly.
- Prioritise the overhanging lower sections which shed water fastest and are least affected by seepage, but only once surface conditions have genuinely improved.
Do Not Climb
88%
3 days ago
Trollers Gill is currently wet from today's 6.2mm of rain, following a persistently damp period with 90mm in the last 28 days. The enclosed gorge will hold this moisture for an extended period, and the forecast shows further rain over the coming days — conditions are unsuitable for climbing.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The enclosed gorge geometry severely limits airflow and direct sunlight, meaning surface moisture from today's rain and recent weeks of intermittent precipitation will linger far longer than at an open crag.
- Glacially polished limestone in the gill becomes extremely slippery when damp — even residual humidity in the gorge can reduce friction on the smooth, curved walls to dangerous levels.
- Seepage lines are common on the gill walls after prolonged wet spells; with 90mm in the last 28 days, internal seepage paths are likely saturated and will continue weeping for days even without further rain.
- The east-facing aspect means only brief morning sun reaches the walls, and at 300m altitude in early April, temperatures are too cool to drive effective evaporation from shaded gorge walls.
Warnings
2
- Active rain today and ongoing wet conditions make the polished limestone extremely slippery — climbing now risks serious injury from friction loss.
- Heavy rain forecast on April 15 (14.2mm) will reset any drying progress, so do not assume conditions will improve steadily through the week.
Reasoning
The rock is currently wet from 6.2mm of rain today, compounding moisture from a very wet recent period including 11.8mm in the last 7 days and 90.1mm over 28 days — the gorge walls and pockets will be holding significant water.
The sheltered gorge with east-only morning sun and light-to-moderate winds provides minimal drying capacity; with zero consecutive dry days and persistent humidity, virtually no meaningful drying has occurred since the last dry spell ended on April 9th.
Limestone does not suffer structural weakening when wet, but the glacially polished surfaces become treacherously greasy, posing a serious fall risk on the technical, friction-dependent routes.
Early April at 300m altitude in the Dales means cool temperatures (averaging 7°C), limited solar angle, and the typical spring pattern of frequent frontal rain — conditions are marginal even in dry spells and poor now.
Contributing Factors
7
6.2mm of rain today means the rock is currently wet with no drying time elapsed.
90.1mm over 28 days with frequent rain events means the gorge environment is thoroughly wet and seepage lines are likely active.
The narrow, sheltered gorge traps humidity and blocks wind-driven drying, dramatically extending drying times compared to open crags.
East-facing walls receive only morning sun, insufficient to drive significant evaporation from the deep gorge in early April.
Glacially polished limestone loses friction dramatically when damp, making the technical routes dangerous even with surface-level moisture.
Average temperatures of 7°C over the last week provide minimal evaporative drying potential.
Further rain forecast on April 12 (6.4mm), 13 (1.8mm), 14 (1.1mm), and a heavy 14.2mm on April 15, preventing any sustained drying window.
Recommendations
3
- Do not visit Trollers Gill today or in the coming days — the gorge needs a sustained dry spell of at least 3–4 days with lower humidity before conditions will be suitable.
- Monitor weather closely for a dry window after April 16; if April 17 onwards remains dry, the earliest realistic opportunity might be April 19–20 depending on humidity.
- If you must climb this weekend, consider an exposed south-facing limestone venue at lower altitude where wind and sun will have dried the rock more effectively.
Do Not Climb
45%
4 days ago
Despite today being dry with relatively low humidity (68%), just 2.1mm fell yesterday and the past 28 days have been very wet (92mm total) with frequent rain events — the enclosed gorge at Trollers Gill will still be holding significant moisture from recent and cumulative rainfall. With rain forecast again tomorrow and through the coming days, conditions are unlikely to be reliably dry.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The enclosed gorge acts as a moisture trap — sheltered from wind and with limited sun penetration, seepage from the limestone walls can persist for days after heavy rain, and the 27.4mm deluge on March 24th followed by repeated rain events means the rock mass is thoroughly saturated.
- East-facing aspect means only morning sun reaches the walls, and in early April the sun angle is still relatively low — the narrow gorge floor and lower walls may see very little direct sunlight, severely limiting evaporative drying.
- Glacially polished limestone surfaces become treacherously slippery with even a thin moisture film; the smooth, curved walls characteristic of Trollers Gill are especially prone to this compared to rougher limestone venues.
- The gorge is within the Yorkshire Dales National Park with a 25-minute walk-in from Parcevall Hall — if conditions prove unsuitable on arrival there are no nearby alternative crags, so checking conditions before committing is especially important.
Warnings
2
- Glacially polished limestone in the gorge can appear dry but still have a thin moisture film that drastically reduces friction — test holds carefully.
- Significant rain is forecast for the next several days (nearly 18mm across 5 days), so conditions will likely worsen before they improve.
Reasoning
Only one full dry day (today) following 2.1mm on April 9th, with 92mm over the past 28 days including multiple heavy events — the enclosed gorge will have significant residual moisture on walls and in seepage lines.
The sheltered gorge position blocks wind almost entirely, and the east-facing aspect provides only limited morning sun, meaning drying has been minimal despite today's favourable 68% humidity and moderate SW winds which won't penetrate the gorge.
Limestone does not suffer structural damage when wet, but the glacially polished surfaces become extremely greasy with residual moisture, creating a significant slip and fall hazard.
Early spring in the Yorkshire Dales at 300m altitude means cool temperatures (averaging 7°C over the past week), short effective drying windows, and the rock mass retains winter saturation — conditions are marginal at best for an enclosed limestone gorge.
Contributing Factors
6
92mm over the past 28 days with rain on most weeks means the limestone and gorge environment are thoroughly saturated, feeding persistent seepage.
Just one full dry day since the last rain (2.1mm on April 9th) is insufficient drying time for an enclosed sheltered gorge.
Today's 68% humidity is the lowest in several days and helps surface evaporation, though the sheltered gorge will not benefit as much as an open crag.
The narrow enclosed gorge blocks almost all wind and limits sun exposure, dramatically slowing drying compared to open limestone faces.
7.9mm forecast for April 11th will re-wet any surfaces that have begun to dry, resetting the drying clock entirely.
Average temperatures around 7°C over the past week provide limited evaporative energy, especially within a shaded gorge at 300m altitude.
Recommendations
3
- Wait for a sustained dry spell of at least 2–3 consecutive dry days with low humidity before visiting — the enclosed gorge needs significantly more drying time than open limestone venues.
- If you do visit today, be prepared to walk away; test friction on lower holds before committing to any route and avoid polished or concave sections that trap moisture.
- Consider alternative open, south-facing limestone crags in the Dales (e.g. Kilnsey or Blue Scar) which will dry faster and may offer climbable conditions sooner.
Marginal — Assess Conditions
55%
5 days ago
Three good drying days (Apr 6–8) following the last significant rain on Apr 5 have likely dried exposed and overhanging limestone surfaces, but the enclosed gorge setting, high recent humidity, today's trace precipitation, and 109mm of rain in the last 28 days mean seepage and residual dampness in pockets are plausible. Climbers should visually and physically check holds before committing.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Trollers Gill is an enclosed, narrow gorge where air circulation is minimal — even when open crags are dry, the gorge interior can remain damp and greasy for considerably longer.
- The east-facing aspect means walls receive only morning sun; by early afternoon the gorge is in shade, limiting solar drying of the glacially-polished limestone surfaces.
- Heavy cumulative rainfall (109mm in 28 days) can reactivate seepage lines through the limestone bedding planes, causing persistent weeping on sections of the gorge walls even days after surface rain stops.
- The 25-minute walk-in via Parcevall Hall is straightforward but the gorge floor itself may be muddy and slippery underfoot given recent wet conditions — appropriate footwear for the approach is advisable.
Warnings
2
- Glacially-polished limestone in the gorge becomes extremely slippery with even light moisture or high humidity — falls are a serious risk on technical slabby or vertical routes.
- Seepage from prolonged wet weather may persist on sections of the gorge wall despite dry surface conditions; check for wet streaks and drips before climbing beneath overhangs.
Reasoning
Three fully dry days (Apr 6–8) with warm temps up to 18°C should have dried exposed and overhanging surfaces, but the sheltered gorge, high overnight humidity (90%+), and today's 0.2mm of precipitation leave uncertainty about pockets, seepage lines, and shaded recesses.
The east aspect and sheltered gorge position severely limit both sun exposure and wind penetration, meaning the three dry days have been less effective here than they would be at an open south-facing crag — surface drying is likely adequate on overhangs but suspect in grooves and pockets.
Limestone does not suffer structural weakening when wet, so there is no hold-breakage risk from climbing on damp rock — the concern is purely friction and safety.
Early April in the Yorkshire Dales is transitional with cool overnight temps near freezing, high background humidity, and limited solar elevation — conditions are marginal and drying is slow at 300m altitude.
Contributing Factors
7
April 6–8 were fully dry with temperatures reaching 18.3°C on the 8th, providing meaningful surface drying time.
The narrow gorge traps humidity and blocks wind, dramatically slowing drying compared to exposed crags.
109mm over 28 days saturates the limestone bedding and increases seepage risk through joints and fissures.
0.2mm today breaks the dry spell and, combined with 84% humidity, keeps surfaces from drying further.
East-facing walls only receive morning sun, limiting solar drying — especially problematic in a deep gorge.
Humidity reached 93% overnight and remains at 84% today, which can deposit condensation on cold limestone and make holds greasy.
Temperatures of 12–18°C over Apr 6–8 are well above average for the altitude and season, boosting evaporation.
Recommendations
3
- Visually inspect and touch-test holds before climbing — if limestone feels greasy or slick, conditions are not suitable even if surfaces appear dry.
- Prioritise overhanging routes on the lower gorge walls, which dry fastest and are least affected by seepage and condensation.
- Consider waiting for tomorrow (Apr 10) which forecasts lower humidity (70%) and may offer better friction, but still check conditions on arrival.
Marginal — Assess Conditions
62%
6 days ago
Three consecutive dry days including two warm, sunny days (Apr 6–8) following a wet spell ending Apr 5 should have dried exposed limestone surfaces, but Trollers Gill's enclosed, sheltered gorge retains moisture significantly longer than open crags. Conditions are likely acceptable on overhanging and well-drained faces, but pockets, seepage lines, and shaded lower walls may still be damp — visual assessment on arrival is essential.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Trollers Gill is a deeply enclosed, narrow gorge where air circulation is poor — even with three dry days, humidity lingers inside the gill and drying is markedly slower than at open limestone venues.
- The east-facing aspect means only morning sun reaches the walls; by early afternoon the gorge is in shadow, limiting solar drying particularly on the deeper, west-facing walls within the gill.
- The gorge floor often remains damp or muddy long after the walls have dried, and seepage from the limestone above can persist for days after heavy rain — the 27.4mm event on Mar 24 and repeated smaller falls since may still be feeding seepage lines.
- Glacially polished limestone surfaces in the gill become exceptionally greasy with even light moisture or high humidity — friction is noticeably worse here than on rougher limestone venues.
Warnings
2
- Glacially polished limestone becomes dangerously slippery with even slight dampness — test friction carefully on lower holds before committing to any route.
- Seepage lines in the gorge may still be active after the very wet recent period; do not assume dry surfaces elsewhere mean the whole crag is dry.
Reasoning
The last rain was 3.5mm on Apr 5, preceded by a wet fortnight totalling ~110mm over 28 days; while surface rock on exposed faces should be dry after three rain-free days with warm temperatures (up to 17.8°C today), the enclosed gorge environment and persistent seepage from the saturated limestone above mean deeper recesses and pockets may still hold moisture.
Three dry days with temperatures reaching 12–18°C and moderate westerly winds would dry an open crag well, but Trollers Gill's sheltered, enclosed nature and east-only aspect severely limit both wind penetration and solar heating, meaning effective drying is perhaps half what you'd expect at an open south-facing venue.
Limestone does not suffer structural weakening when wet, so there is no hold-breakage concern from recent moisture; the risk is entirely friction-related.
Early April in the Yorkshire Dales at 300m is marginal — days are lengthening but temperatures are still cool, humidity remains high (78% today), and the recent pattern of repeated Atlantic fronts means the ground and rock mass are thoroughly saturated from winter.
Contributing Factors
7
No rain since Apr 5 (3.5mm), with two notably warm and sunny days (Apr 6–7 reaching 12–16°C with low humidity in the afternoon) providing meaningful drying.
Today's forecast high of 17.8°C is the warmest in weeks, aiding evaporation from rock surfaces.
The narrow, enclosed gill traps humid air and blocks wind, dramatically slowing drying compared to open crags even during dry spells.
Nearly 110mm over 28 days has thoroughly saturated the limestone and surrounding ground, feeding potential seepage lines within the gorge.
East-facing walls receive only morning sun, leaving much of the gorge in shade during the warmest part of the day when drying potential is highest.
Humidity of 78% is moderate-high and will reduce friction on polished limestone surfaces, particularly in the enclosed gorge where ventilation is poor.
Yesterday saw humidity drop to 45–48% during midday with clear skies, providing an excellent drying window that will have helped surface conditions.
Recommendations
3
- Visit in the morning when east-facing walls receive direct sun and before humidity builds up in the enclosed gorge.
- Prioritise overhanging routes and steeper walls which dry fastest and are least affected by residual seepage — avoid slabby or pocket-heavy routes until you've confirmed they are bone dry.
- Carry a towel and be prepared to walk away if pockets hold water or holds feel greasy; conditions in an enclosed gorge can be much worse than the approach suggests.
Do Not Climb
40%
8 days ago
Trollers Gill received 3.5mm of scattered showers yesterday (April 5th) and has had only one dry day since; the enclosed gorge will still be holding moisture in pockets and seepage lines. While today is dry with lower humidity (75%), the sheltered gorge environment, high recent rainfall (112mm in 28 days), and cool temperatures mean the rock is very likely still damp in places — limestone here will be greasy and unsafe for technical climbing.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The enclosed gorge traps humidity and blocks airflow, meaning surface moisture from yesterday's showers and weeks of heavy rain will linger far longer than at an open crag.
- East-facing walls only receive morning sun, so by the time the gorge floor and lower walls warm up, direct sunlight is already moving off — limiting evaporative drying today.
- Glacially polished limestone in the gill becomes exceptionally slippery when even slightly damp, making the sustained technical climbing here (6a–7a) particularly hazardous in marginal conditions.
- The gorge floor is likely still wet from accumulated runoff, and seepage from the surrounding hillside after 112mm of rain in 28 days may persist for several more days.
Warnings
2
- Glacially polished limestone in the gorge will be extremely greasy if any residual moisture is present — a fall risk on technical routes is high.
- Seepage lines from the surrounding hillside may be active for days after 112mm of rain in 28 days; inspect routes carefully even when they appear superficially dry.
Reasoning
With 3.5mm of rain yesterday, 11.9mm in the last 7 days, and 112mm in 28 days, the enclosed gorge walls are very likely still damp — pockets and tufa features will be holding water, and seepage lines will be active.
Only one full dry day so far, sheltered from wind (today just 16 km/h from the south which won't penetrate the gorge), and east-facing aspect means limited direct sun — drying has been minimal and insufficient for this enclosed venue.
Limestone does not suffer structural weakening when wet, so rock integrity is not at risk, but greasy holds on polished limestone pose a serious slip hazard.
Early spring conditions in the Yorkshire Dales at 300m mean cool temperatures (average 6.5°C over the last week), slow evaporation, and the crag is in its most moisture-prone seasonal phase.
Contributing Factors
7
112mm in 28 days with 3.5mm as recently as yesterday means the gorge is saturated and seepage will be active.
A single dry day is far too little drying time for an enclosed limestone gorge that traps moisture.
The narrow, enclosed gorge blocks wind and limits airflow, dramatically slowing evaporation from rock surfaces.
East-facing walls only receive morning sun, restricting the daily drying window to a few hours at most.
No rain today with humidity dropping to 75% provides some drying, but insufficient after such a wet period.
Average temperatures of 6.5°C over the last week slow evaporation significantly at this 300m altitude site.
Glacially polished Carboniferous limestone becomes extremely slippery with even residual dampness, and humidity of 75% with a recently wet gorge will reduce friction.
Recommendations
3
- Wait for at least 2–3 consecutive dry days with low humidity before visiting Trollers Gill — the gorge needs significantly more drying time.
- If you do visit, check the gorge floor and lower walls for dampness and seepage before committing to any routes; retreat if rock feels greasy.
- Consider an open, south-facing limestone venue or a well-drained steep sport crag as an alternative today — enclosed gorges are the worst-drying venues in these conditions.
Do Not Climb
30%
9 days ago
Trollers Gill has received 2.2mm of rain today on top of a very wet recent period (110mm in 28 days, 13.4mm in 7 days), with zero consecutive dry days. The enclosed, sheltered gorge will be holding significant moisture — seepage lines will be active and limestone surfaces will be greasy despite the lower humidity today.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The enclosed gorge acts as a moisture trap: glacially polished walls channel seepage and the narrow gap restricts airflow, meaning drying times are significantly longer than open limestone venues even after rain stops.
- The east-facing aspect means only morning sun penetrates the gorge — by early afternoon the walls are in shade, severely limiting solar drying especially in early April when sun angles are still relatively low.
- The sheltered position that makes Trollers Gill pleasant in wind also works against it for drying: the 49 km/h westerly winds today will barely penetrate the narrow gorge to aid evaporation.
- The gorge floor is likely to be saturated and muddy given the prolonged wet spell, making approach conditions underfoot slippery and adding ambient moisture to the climbing environment.
Warnings
2
- Active seepage is highly likely throughout the gorge given recent sustained rainfall — do not assume dry-looking surfaces are friction-safe on polished limestone.
- The gorge floor will be wet and slippery; take care on the approach and consider the muddy path conditions after heavy recent rain.
Reasoning
With 2.2mm of rain today, 13.4mm in the last 7 days, and zero consecutive dry days, the gorge walls will have active seepage lines and residual surface moisture throughout — pockets and tufa features will be holding water.
Despite strong westerly winds (49 km/h), the sheltered gorge geometry prevents meaningful wind penetration, and the east-facing aspect provides only limited morning sun; effective drying within the gorge will be minimal today.
Limestone does not suffer structural weakening when wet, so rock integrity is not a concern, but the glacially polished surfaces will be extremely slippery with any residual moisture.
Early April at 300m in the Yorkshire Dales is a marginal season — average temperatures of just 6.4°C over the past week provide minimal evaporative drying, and the high average humidity (83%) means the air is already near saturation.
Contributing Factors
7
2.2mm today with no consecutive dry days and 13.4mm over the past week means surfaces have had no opportunity to fully dry.
The narrow, sheltered gorge traps humidity and restricts both wind and sun penetration, dramatically slowing drying compared to open crags.
110.4mm over 28 days will have saturated the limestone bedrock, feeding seepage lines that will remain active for days after rain ceases.
Today's humidity of 73% is the lowest in weeks, which is encouraging but insufficient on its own to dry a sheltered gorge that received rain today.
The 49 km/h westerly is strong but largely irrelevant inside the sheltered gorge where it cannot penetrate to aid drying.
Max of 7.1°C today and an average of 6.4°C over the week provide very limited evaporative potential.
Glacially polished limestone loses friction dramatically when even slightly damp, making technical slab and wall climbing hazardous.
Recommendations
3
- Wait for at least 2–3 consecutive dry days before visiting — the forecast suggests April 7th or 8th may be the earliest realistic window, but assess on arrival.
- If visiting later this week, prioritise steep overhanging routes in the lower gorge which shed water fastest and are less affected by residual seepage.
- Check the BMC RAD for any bird nesting restrictions at Trollers Gill before visiting, as peregrine and raven nesting season is well underway in April.
Do Not Climb
30%
10 days ago
Trollers Gill has received 23mm of rain in the last 7 days including precipitation today, and the enclosed gorge's sheltered nature with persistently high humidity (85% average) means seepage and residual moisture are highly likely on the limestone walls. With zero consecutive dry days and the gorge's known tendency to hold moisture, conditions are almost certainly too damp for safe, friction-dependent limestone climbing.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- Trollers Gill's enclosed gorge geometry traps humid air and dramatically slows drying compared to open limestone crags — seepage lines on the back walls can persist for days after heavy rain.
- The east-facing aspect means walls only receive direct morning sun, and in early April the sun angle is still relatively low, limiting effective solar drying of the gorge interior.
- The heavy rain on March 24th (27.4mm) and March 29th (11.4mm) combined with continued showers through early April will have saturated the limestone and recharged seepage lines throughout the gorge.
- The gorge floor is likely very wet and muddy given the recent rainfall pattern, making the 25-minute approach and crag-base conditions unpleasant and potentially hazardous.
Warnings
2
- Glacially polished limestone in the gorge becomes extremely slippery when damp — even a thin moisture film drastically reduces friction on the technical slab and wall routes.
- Active seepage from saturated ground above the gorge is likely on multiple routes; pockets and tufa features may be holding standing water.
Reasoning
With 23mm in the last 7 days, rain today (1.8mm), and zero consecutive dry days, the limestone surfaces inside the sheltered gorge are very likely damp with active seepage in pockets and grooves.
The sheltered gorge position blocks wind almost entirely despite high regional wind speeds, and the east-facing aspect provides only limited morning sun — drying has been minimal between the frequent rain events of recent weeks.
Limestone does not suffer structural weakening when wet, but the glacially polished surfaces at Trollers Gill become exceptionally slippery when damp, creating serious fall risk on the technical, friction-dependent routes.
Early April in the Yorkshire Dales at 300m altitude is still transitional — cool temperatures (averaging 6.6°C) slow evaporation, and the prolonged wet March (108.6mm over 28 days) has left the ground and rock thoroughly saturated.
Contributing Factors
7
23mm in the last 7 days with 1.8mm today and zero consecutive dry days means the rock has had no meaningful drying window.
The enclosed gorge traps humidity and blocks the strong regional winds, preventing the surface drying that would occur on an exposed crag.
Average humidity of 85% over the past week keeps evaporation rates very low and limestone greasy even where not directly wet.
108.6mm over 28 days has thoroughly saturated the surrounding ground and recharged all seepage lines feeding into the gorge walls.
Average temperatures of 6.6°C over the past week significantly slow evaporation from rock surfaces and pockets.
East aspect receives only morning sun at a low early-April angle, providing insufficient solar energy to dry the deep gorge interior.
A dry spell from April 6th–8th with dropping humidity (69–71%) and warmer temperatures (up to 17°C) offers a genuine drying window in the coming days.
Recommendations
3
- Wait for the dry spell forecast from April 6th onwards — two to three consecutive dry days with lower humidity should significantly improve conditions.
- If visiting later in the week, prioritise the steeper overhanging routes in the lower gorge which shed water fastest and are least affected by seepage.
- Check the BMC RAD for any bird nesting restrictions at Trollers Gill before visiting, as peregrine and raven nesting season is active through April–June.
Do Not Climb
85%
11 days ago
Trollers Gill is currently receiving rain today (4.3mm) on top of a very wet recent period (24mm in the last 7 days, 115mm in the last 28 days). The enclosed gorge will be holding significant moisture with active seepage likely — conditions are unsuitable for climbing today.
Based on weather conditions only — does not cover bird nesting restrictions or other access issues.
- The enclosed gorge geometry traps humidity and dramatically slows drying compared to open limestone crags — after 115mm in 28 days, seepage lines on the gorge walls will be active and persistent.
- East-facing aspect means only morning sun reaches the walls, and in early April the sun angle is still relatively low — afternoon drying relies entirely on air movement, which is limited inside the sheltered gorge.
- Glacially polished limestone surfaces become exceptionally greasy with even a thin moisture film, making the sustained technical climbing here (6a–7a) dangerously slippery.
- Pockets and tufa features characteristic of Trollers Gill hold water for extended periods after heavy rain and can weep onto routes below even when the surface appears dry.
Warnings
3
- Active rain today combined with saturated ground conditions means the gorge floor may have running water and rock surfaces will be extremely slippery.
- Do not assume overhanging routes are dry — high humidity and gorge-trapped moisture can make even steep rock greasy without visible wetness.
- Check the BMC RAD for any bird nesting restrictions at Trollers Gill — peregrine and raven nesting season is active (February–June).
Reasoning
With 4.3mm falling today, 23.9mm in the last 7 days, and 115.3mm over 28 days, the gorge walls will be saturated with active seepage from the limestone and standing water on the gorge floor.
Zero consecutive dry days and a sheltered east-facing gorge at 300m mean virtually no effective drying has occurred; the gorge's enclosed nature blocks wind penetration despite strong winds regionally.
Limestone does not suffer structural weakening when wet, but the sustained moisture loading increases the risk of loose surface material and greasy friction on glacially polished surfaces.
Early spring in the Yorkshire Dales brings cool temperatures (averaging 6°C), short effective drying windows, and persistently high humidity (85% average) — all of which prolong moisture retention in enclosed gorges.
Contributing Factors
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4.3mm of precipitation today means the rock is actively wet right now with no drying window.
115mm over 28 days and 24mm in the last week have saturated the gorge, ensuring deep seepage and prolonged moisture retention.
There has been no uninterrupted dry spell to allow the enclosed gorge to begin draining and drying.
85% average humidity over the past week prevents effective evaporation, especially within the sheltered gorge microclimate.
Despite strong regional winds (36 km/h SW today), the narrow gorge geometry blocks wind penetration, trapping moist air and slowing surface drying.
Average temperatures around 6°C limit evaporation rates, extending the drying time needed for limestone pockets and seepage lines.
From April 5th, humidity drops to 67–69% with minimal rain and stronger winds, suggesting a genuine drying window is approaching.
Recommendations
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- Do not climb at Trollers Gill today — the gorge is actively wet and limestone friction will be dangerously poor.
- Monitor conditions from April 6th onwards; if the dry spell holds with lower humidity, the overhanging sections may come into condition first.
- On your next visit, check for seepage on the upper walls and test friction carefully on the glacially polished surfaces before committing to routes — even apparently dry limestone in the gorge can be deceptively greasy.
Climbing Outlook