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
| Location | km | Elevation |
|---|---|---|
Start Start | 0.0 | 105 m |
Finish Finish | 161.2 | 105 m |
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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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