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
| Location | km | Elevation |
|---|---|---|
Start Start | 0.0 | 105 m |
Finish Finish | 105.6 | 105 m |
Sign in to see cutoffs, crew access, drop bags, and services for every aid station.
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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