The Grim Reaper Ultra Marathon

Based at Grimsthorpe Castle, the race is non-stop and will continue through the night, incorporating multiple loops through the beautiful grounds.

Solo Entries

You can enter the marathon on your own, with distances of 40, 70, or 100 miles!

Team Entries

Like to take on the challenge with your friends? You can enter a team for 40 miles (2), 70 miles (3) or 100 mile (4).

The Location & History

The GrimReaper UltraMarathon started in 2009 and is going from strength to strength. The race has gained a loyal following year on year, proving to be hugely popular. Located in the grounds of Grimsthorpe Castle, Lincolnshire, the historic house, park and gardens, are a fantastic venue for the event.