Arc 50K is the 49.4km trail race at Arc of Attrition by UTMB 2027 (Perranporth, United Kingdom). The race starts on January 24, 2027 at 09:00 AM. The time limit is 9 h.
The course climbs 1458m+. With 30m/km of climbing, this is a rolling, mostly runnable course. By gradient, 19% of the distance is uphill, 22% downhill and 60% flat. Surface: 71% trail, 13% technical, 9% smooth, and 6% road. Flat-equivalent effort: 59.4 FlatKM.
The course is runnable enough that trekking poles are not needed.
Quad damage risk is low (index 9 of 100): a few descents worth noting, none of them decisive.
On race day, start temperatures have historically ranged from 5°C to 11°C, with around 8°C at the highest point; the chance of precipitation is about 57%. Heavy rain of 10.0mm or more falls on about 13% of days around this date.
This page has a pacing and nutrition planner, a gradient matrix, an interactive elevation profile and historical weather for Arc 50K.
Other distances of Arc of Attrition by UTMB 2027Arc 100M (173km)·Arc 100K (82.7km)·Arc 20K (22.1km)
Other editions of Arc 50K2026·2025
Official websitearcofattrition.utmb.world
