Alpine-scale mountain ultra through northern Eryri's best terrain
Other trail races within 172 miles
The UTS 100K covers the highlights of northern Eryri's most technical and spectacular terrain. A 100km loop starting and finishing in Llanberis, the course takes runners through alpine-scale mountain scenery with significant technical sections including scree, rocky ridgelines, and some scrambling over prominent peaks and summits. With 4,400m of elevation gain and a 30-hour time limit, it's a formidable mountain ultra that rewards experienced trail runners with some of the finest — and most challenging — trail running in the UK.
Experienced ultrarunners
Llanberis, Wales, United KingdomMay 15, 2027
Eryri 100K is a loop trail race in Llanberis, Wales, United Kingdom, held on May 15, 2027. The course covers 108 km, climbs 5,833 m, and has a 32h30m cutoff.
| Location | km | Elevation | Cutoff | Crew | Drop bags |
|---|---|---|---|---|---|
Start Start | 0.0 | 105 m | — | ||
Finish Finish | 108.0 | 105 m | 32h30m2:00 PM +1 |
Aid station details for this race are still being filled in. Cutoffs and access rules come from the race’s own published information and can change — check the official race details before planning around them.
Sign in for race-day weather at every station, points of interest, segment-by-segment analysis, pacing, and to save this race to your calendar.
Welsh mountain weather is unpredictable in May — rain, strong wind, and snow are possible on exposed terrain
Nighttime temperatures on exposed ridgelines can drop near freezing
Wet and muddy conditions are typical in Welsh mountains year-round
No required gear specified
No recommended gear specified
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