
About the event
With 1,676 meters of elevation gain over 100 miles, the Grim Reaper Ultra is as much a test of mental toughness as it is of physical endurance. Runners face ten loops of rugged, undulating terrain, where strategic pacing and nutrition are key to conquering the course. Hosted by Bog Dog Running, this fully supported ultra provides aid stations, medical support, and a vibrant community of runners and crew to keep spirits high. Whether you’re aiming for a 100-mile belt buckle or simply hoping to outlast the Grim Reaper, this is an ultra experience like no other.
Date:
Sat
May 24
2025
Location:
Distance:
Elevation profile:
Moderate
Website:
LinkElevation gain:
Number of participants:
Other distances for this race
Find the best training plan for your goals and the distance you’re planning to run:
Stories from Runnas
The Grim Reaper 100-Mile Ultra, scheduled for May 24–25, 2025, is the ultimate endurance battle, featuring 1,676 meters of elevation gain across ten relentless loops of Grimsthorpe Castle’s legendary trails. Organized by Bog Dog Running, this race is designed for ultra veterans and ambitious first-timers, offering a true test of grit, patience, and strength.
If you are an official race organiser with any questions about this page, please get in touch: races@runna.com
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