Eryri Ultra-Trail by UTMB Eryri 100K 2027
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Also known as: Ultra-Trail Snowdonia · UTS
Mountain trail races in Eryri National Park, Wales. Eryri 100K: published distance 108 km.
The course tops out at 1,066 m (low point 68 m). 7 climbs of 500 m or more keep coming; the biggest is 998 m around 71–77 km. The longest descent drops 922 m around 77 km at about 14% on average. About 30% of the distance is gentle (under 5% grade).
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How the prediction works
Enter your ITRA performance index to get an estimated finish time, aid-station splits and cutoff margins. This race has no finisher ITRA data, so it uses the transfer model: your predictions for the 291 races that do have finisher data, scaled by distance and elevation gain (km-effort) — the same calculation as the TRAIL STATUS app. Nothing is saved automatically or sent.
The app adds predictions from your training log (Strava), race-day pacing and more. Free, no sign-up.
Predict in detail from my Strava trainingOverview
- Date
- Sat, 15 May 2027
- Start
- 05:30
- Location
- United Kingdom
- Distance
- 108 km
- Elevation gain
- 5,800 m
- Time limit
- 32h 30m
- Official website
- eryri.utmb.world/races/Eryri-100K
Elevation profile
Aid stations and cutoffs
| # | Distance | Aid station | Segment | Cutoff |
|---|---|---|---|---|
| 1 | 14.1 km | Gwastadanas Farm | 14.1 km | — |
| 2 | 28.2 km | Dolwyddelan | 14.1 km | — |
| 3 | 40.6 km | Blaenau Ffestiniog | 12.4 km | — |
| 4 | 52.8 km | Croesor | 12.2 km | — |
| 5 | 66.5 km | Gwastadanas Farm | 13.7 km | — |
| 6 | 83.3 km | Bron-y-Fedw Uchaf | 16.8 km | — |
| 7 | 91.6 km | Betws Garmon | 8.3 km | — |
| F | 108 km | FINISH | 16.4 km | Day 2 14:0032h 30m |
The small figure under each cutoff is the time from the start. Day 1 is the day of the start.
Other races
- Dragon's Back 380 km 2027Mon, 6 Sep 2027 · United Kingdom · 380 km
- Eryri Ultra-Trail by UTMB Eryri 100M 2027Fri, 14 May 2027 · United Kingdom · 163 km
- Eryri Ultra-Trail by UTMB Eryri 25K 2027Sun, 16 May 2027 · United Kingdom · 25 km
- Eryri Ultra-Trail by UTMB Eryri 50K 2027Sat, 15 May 2027 · United Kingdom · 56 km
- Eryri Ultra-Trail by UTMB Eryri 80K 2027Fri, 14 May 2027 · United Kingdom · 78 km
From your training log, TRAIL STATUS estimates your finish time, aid-station splits and cutoff margins for this race.
Predict my raceCompiled from each race's official information. Details can change, so always check the race's official website for the latest. Spotted a mistake? Please tell us through the contact form.
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Points to consider for this course
- The overall time limit allows about 18:03/km including stops. This average does not guarantee meeting intermediate cutoffs.
- The longest gap between recorded points, including the start, is about 16.8 km (66.5–83.3 km). This does not list every water source.
- Read the recorded profile alongside the cutoffs. Terrain, weather and your condition can change travel time.
These are simple calculations and observations from recorded information, not personal finish probabilities or difficulty ratings.
Results and official information
Historical field finish rates differ from your personal prediction. This is not a live results service; check official announcements for results and changes.
Check rules and results on the official siteInformation checked: 2026-11-06