Grim Reaper Running Festival

Bourne, United Kingdom • 23-24 May 2026

Grim Reaper Running Festival returns to Grimsthorpe Castle Estate in South Lincolnshire on May 23–24, 2026, with distances for all abilities: 10, 40, 70 and 100 miles solo, plus a 100-mile team relay. There are two 10-mile races (day and night). The 10-mile loop combines grass trails through ancient woodland, limestone tracks, quiet estate roads, a stretch along a disused Victorian railway line, and views of the lake, finishing at the castle forecourt. The course is fully marked and the event promotes a friendly, supportive vibe, with on-site camping, medics, an aid station, and finish medals and trophies for top finishers. Visit the organization's website for the most recent information.

Race information

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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