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Grim Reaper Running Festival

Bourne, United Kingdom • 23-24 May 2026

Grim Reaper Running Festival returns to Grimsthorpe Castle Estate in South Lincolnshire. The event offers four solo ultra-distance options—10, 40, 70 and 100 miles—with a 100-mile team relay, plus two 10-mile races (day and night). The full marked, undulating 10-mile loop weaves through grass trails, ancient woodland, limestone tracks and quiet estate roads, including a stretch along a disused Victorian railway line and a lakeside section before finishing at the castle. Runners can camp on-site, and ultras are self-sufficient with a mid-race aid station; medics are on site. Trophies crown top finishers; spectators are welcome, and on-site camping is free. Visit the organization's website for the most recent information.

United Kingdom East Midlands (England) Bourne

Race information

Website
UTMB 50K UTMB 100K UTMB 100M
100 mi
100 Miles
100 mi
100-Mile Team Relay
70 mi
70 Miles
40 mi
40 Miles
10 mi
10 Miles (day Race)
10 mi
10 Miles (night Race)
Visit the organization's website for the most recent information.
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