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 15, 2027
Ultra-Trail Snowdonia UTS 100K is a loop trail race in Llanberis, Wales, United Kingdom, held on May 15, 2027. The course covers 108 km, climbs 5,800 m, and has a 32h30m cutoff.
This edition has its own course and we haven't mapped it yet. The interactive map, elevation profile and aid stations will appear here once the route is confirmed.
We do have the 2026 route on file. We aren't showing it here, because a race's course — and sometimes its finish line — can move between editions, and a stale map is worse than no map.
Aid stations for this edition aren't published yet. They'll appear here once the route is confirmed.
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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