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.