Grim Reaper 40-mile
- When
- Sat, May 23, 2026, 12:00 AM
- Where
- Grimsthorpe, GB
- Distances
- 10 Mile · Ultra Marathon
- Terrain
- MIXED
- Price
- 32–300 GBP
- Elevation gain
- 1676 m
- Typical weather
- Mild
- Organizer
- Bog Dog Running Limited
About
The Grim Reaper 10‑Mile is a thrilling trail-running challenge set in the scenic Grimsthorpe Castle Estate in Lincolnshire, UK, covering 10 miles (≈16 km) of undulating woodland paths, estate roads, and historic tracks, with the option to tackle the distance during the day or at night.