UTS 100K is a 106 km ultra trail of Ultra-Trail Snowdonia by UTMB 2025 in Llanberis, United Kingdom. The race starts on May 15, 2025. The course climbs 6167 m+ and descends 6164 m−, between a low point of 60 m and a high point of 1050 m. By gradient, 37% of the distance is uphill, 43% downhill and 20% flat. The longest climb runs 6.2 km at an average 13.9% grade (864 m of vertical). The longest descent runs 6.3 km at 14.3% (901 m of vertical). Surface: 41% trail, 26% technical, 23% smooth, and 5% road. Flat-equivalent effort: 159.0 FlatKM.
586 finishers completed the 2025 edition. Men's winner: Jonathan Albon (Great Britain) in 11:34:51. Women's winner: Stephanie Case (Canada) in 16:53:22.
This page has the full results and splits, interactive elevation profile, gradient matrix, pacing and nutrition planner and weather climatology for UTS 100K.
Other distances of Ultra-Trail Snowdonia by UTMB 2025UTS 100M (164 km)·UTS 50K (56.0 km)
Other editions of UTS 100K2026
Official websitesnowdonia.utmb.world
