Alpine-scale mountain ultra through northern Eryri's best terrain
Other trail races within 199 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 16, 2026
Ultra-Trail Snowdonia UTS 100K is a loop trail race in Llanberis, Wales, United Kingdom, held on May 16, 2026. The course covers 100 km, climbs 5,495 m, and has a 30h cutoff.
| Location | km | Elevation | Cutoff | Crew | Drop bags |
|---|---|---|---|---|---|
Llanberis Start | 0.0 | 105 m | — | ||
Bwlch Glas (Finger Stone) Checkpoint | 7.1 | 992 m | — | ||
Gwastadannas Farm Aid Station | 14.1 | 97 m | 5h10:30 AM | ||
Moel Siabod Checkpoint | 22.8 | 865 m | — | ||
Dolwyddelan Aid Station | 29.3 | 144 m | 9h2:30 PM | ||
Blaenau Ffestiniog Aid Station | 41.8 | 223 m | 13h6:30 PM | ||
Moelwyn Mawr Checkpoint | 50.8 | 739 m | — | ||
Croesor Aid Station | 54.1 | 161 m | 16h30m10:00 PM | Drop Bags | |
Cnicht Checkpoint | 57.4 | 638 m | — | ||
Gwastadanas Farm Aid Station | 67.5 | 110 m | 20h30m2:00 AM +1 | ||
Beddgelert Aid Station | 81.6 | 46 m | 25h6:30 AM +1 | ||
Rhyd Ddu Aid Station | 95.9 | 188 m | 29h30m11:00 AM +1 | ||
Llanberis Finish | 100.0 | 105 m | 32h30m2:00 PM +1 | Drop Bags |
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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