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entries openGB Ultras
Yr Wyddfa Ultra 100
GB Ultras 100 Mile Series
Next edition: Saturday, 4 September 2027 – Monday, 6 September 2027Betws-y-Coed, Wales
A self-navigated 100-mile mountain race through Eryri, combining a high-level route, severe-weather alternative, eleven checkpoints and sustained overnight exposure.
Race area · approximate race area. Approximate race area. Check the organiser’s website for the exact start and race-day directions.
Location evidence
Existing saved event-to-place evidence reused; geography query derived from 'Betws-y-Coed'. GeoNames exact settlement/suburb name match for 'Betws-y-Coed', country Wales, administrative area Conwy, region Wales; population 1200 (zero means unspecified). Representative event-area point, not a venue address, exact start or radius guarantee. Directional catalogue locations use the first disclosed event locality only as EVENT_AREA; other route endpoints are not substituted. Geographic lookup does not reverify dates or non-location facts. GeoNames (https://www.geonames.org/), CC BY 4.0; transformed to event-area coordinates with separate event-source evidence.
Location checked 2026-09-14.
Official race site (opens in a new tab)
Optional device-only history; never synced to your account. Shared-device users can leave it off.
Distance102 mi
Ascent5,172m
Climb / km31.5m
Cutoff42h
Cutoff pace15:21/km
Technicality9/10
Entry£229
FormatLooped
Next edition
4 September 2027 – 6 September 2027
This is the most relevant confirmed edition currently held for the permanent race family. Edition-specific facts should still be checked against the final organiser instructions.
Edition archive
Expand an edition to inspect its year-specific facts. Other years never replace the primary edition facts.
Past editions
2026 to Past edition
These facts belong to the 2026 edition only. Missing values have not been copied from another year.
- Distance
- 164.15 km
- Ascent
- 5,172m
- Cutoff
- 42h
- Entry
- £209
- Format
- continuous · single stage · looped
- Stage layout
- Not applicable
Successful source check: 3 Sept 2026Source confidence: mediumThe official event-page vital statistics list 102 miles, 5,172m, a 42-hour cutoff, £209 and 150 places for 5 September 2026, and its route copy confirms self-navigation and eleven checkpoints. The series listing instead says 5,788m and 40 hours; the event-page values are retained with Medium confidence and the conflict is explicit.
Check Yr Wyddfa Ultra 100 2026 source (opens in a new tab)
Race For You difficulty
6.9/ 10
Hard
Moderate input evidence · 76% evidence coverage
The main recorded demands are substantial race distance, high climbing demand, technical terrain. Course difficulty and cutoff pressure describe different challenges: more approachable terrain can still require a demanding pace to beat the deadline. Neither score assesses your personal fitness, safety or readiness.
Scoring details and version
Difficulty V2's separate time-limit modifier adds 0.00 points here and is capped at 0.70; a broad limit cannot erase extreme intrinsic demand. This is independent of the public Cutoff Pressure V2 band. Evidence coverage describes the recorded inputs, not prediction accuracy or your likelihood of finishing.
Weather, conditions and individual preparation can change the real difficulty significantly.
How the score works Distance, weighted 30 percent6.9 out of 10
Climbing, weighted 25 percent6.3 out of 10
Technicality, weighted 15 percent9 out of 10
Accumulated burden, weighted 17 percent5.2 out of 10
Exposure & support, weighted 13 percent6.3 out of 10
Course analysis
What shapes this race
Expect sustained upland ground and meaningful climbing, sections where foot placement and downhill confidence matter, forest trail that may change character in wet conditions.
trailmountainforesttechnical
Climbing density
31.5m per km
A more useful comparison than total ascent alone: it shows how consistently the course asks you to climb.
Cutoff analysis
Moderate pressure
To finish inside 42h, the raw average required is 15:21 per kilometre (24:43 per mile), including every stop.
Raw pace15:21/km
PressureModerate pressure
Cutoff pressure compares the published time limit with distance, ascent and verified course demands. Lower pressure does not mean the race is easy. Raw pace includes checkpoints, food stops, navigation errors and any sleep; it is not a pacing plan.
Who this suits
First ultra?
This is not designed as a first-ultra recommendation. Significant endurance, navigation or mountain-race experience is strongly advised.
1.2/10 suitability
Navigation
self-navigation
Route-finding is part of the challenge. Carry the required mapping tools and be able to use them in darkness and poor visibility.
Exposure & kit
unknown kit
Night-running exposure has not been verified for this edition. Check the organiser’s latest schedule, route information and final kit rules.
Personal race predictor
Will you make the cutoff?
Use a previous result to estimate a realistic range for Yr Wyddfa Ultra 100, your potential buffer and the biggest change in demand.
Practical detail
Support & logistics
Aid stations11 listed
StartCae Llan / Village Green, Station Road, Betws-y-Coed, LL24 0AE
FinishCae Llan / Village Green, Station Road, Betws-y-Coed, LL24 0AE
Support levelunknown
LogisticsParking noted
LogisticsAccommodation nearby
LogisticsBag drop
LogisticsCrew access
Logistics are only shown where currently recorded. Confirm parking, transport, crew access and final aid-station plans with the organiser.
Latest verification
Trust the source, see the gaps.
Data HighChecked 13 September 2026. Entry status: Open. Overall time limit: 42 hours. The official GB Ultras calendar confirms Yr Wyddfa Ultra 100 Mile for 4 September 2027. The overall cutoff above is explicitly published for 2027. Elevation, fee, field, checkpoint and exact route values are not copied from the conflicted 2026 sources. Other stored facts retain their previous source review from 2026-09-01. Field-scoped check 2026-09-28: Current edition page explicitly gives 2027 date and £229 entry fee. Current 2027 header explicitly says 102 miles (164.15 km rounded), despite branded name 100. Official 2027 schedule gives Saturday 4 September start and finish cutoff 00:00 Monday (42 hours), so event remains in progress through the Sunday; end-date boundary is Monday 6 September. Current official edition page publishes a standard entry amount rather than an unverified price. Only these facts were reviewed; other details retain their previous source dates. Field-scoped check 2026-10-20: The 2027 detail page now publishes 5,172 m, 175 places, self-navigation and 11 checkpoints. Retain the published 42-hour limit and Monday 00:00 endpoint (6 September), even though the shared 50/100-mile registration metadata ends 5 September. Header 102 miles conflicts with finish-line label 100 miles; retain the last confirmed 102-mile distance. Those conflicts remain disclosed. Other facts retain their earlier field evidence.
- Successful source check
- 20 Oct 2026
- Catalogue record updated
- 20 Oct 2026
- Official source
- Available
Official source 1 (opens in a new tab)Official source 2 (opens in a new tab)Official source 3 (opens in a new tab)
Event details can change after a successful source check. Confirm the final route, kit, cutoff, price and entry terms directly with the organiser before entering or travelling.
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