163km through the savage, beautiful heart of Snowdonia
Other trail races within 199 miles
The ultimate grand tour of Eryri (Snowdonia), UTS 100M is a 163km loop through the wild heart of North Wales. Starting and finishing in Llanberis at the foot of Yr Wyddfa (Snowdon), the route traverses 12 major mountain passes, crossing some of Wales's highest peaks including Carnedd Llewelyn, Glyder Fawr, and Moelwyn Mawr. Runners navigate rocky scree fields, boggy moorland, and historic slate mining trails through a landscape both breathtaking and unforgiving. With 9,200m of elevation gain and a 48-hour time limit, this is widely considered one of the toughest ultra-trail events in the world.
Recommended for seasoned ultrarunners
Llanberis, Wales, United KingdomMay 15, 2026
Ultra-Trail Snowdonia UTS 100M is a loop trail race in Llanberis, Wales, United Kingdom, held on May 15, 2026. The course covers 163 km, climbs 9,344 m, and has a 48h cutoff.
| Location | km | Elevation | Cutoff | Crew | Drop bags |
|---|---|---|---|---|---|
Llanberis Start | 0.0 | 105 m | — | ||
Pen-y-Pass Aid Station | 11.9 | 367 m | 3h30m5:30 PM | ||
Ogwen Valley Aid Station | 21.8 | 305 m | 6h8:00 PM | ||
Llyn Eigiau Aid Station | 37.2 | 384 m | 10h30m12:30 AM +1 | ||
Capel Curig Aid Station | 49.4 | 187 m | 13h3:00 AM +1 | ||
Dolwyddelan Aid Station | 59.7 | 153 m | 16h6:00 AM +1 | Crew | |
Blaenau Ffestiniog Aid Station | 72.2 | 227 m | 19h30m9:30 AM +1 | Crew | |
Croesor Aid Station | 84.6 | 180 m | 23h1:00 PM +1 | ||
Gwastadanas Aid Station | 98.2 | 76 m | 26h45m4:45 PM +1 | ||
Beddgelert Aid Station | 112.2 | 60 m | 30h30m8:30 PM +1 | Crew | |
Rhyd-Ddu Aid Station | 126.6 | 204 m | 36h2:00 AM +2 | ||
Bron-y-Fedw Aid Station | 139.1 | 169 m | 40h45m6:45 AM +2 | Crew | |
Betws Garmon Aid Station | 147.5 | 129 m | 43h45m9:45 AM +2 | ||
Llanberis Finish | 163.9 | 105 m | 48h2:00 PM +2 |
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 notoriously unpredictable in May — rain, strong wind, and even snow are possible on exposed ridgelines
Nighttime temperatures on high mountain ground can drop near or below freezing, even in May
Wales receives significant rainfall year-round; muddy and wet conditions should be expected throughout the race
No required gear specified
No recommended gear specified
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