Summer Nuts Challenge

AUG
29
2026
The Summer Nuts Challenge is a classic mud obstacle race on a permanent course in Surrey. Choose from a 5 km or 10 km distance and tackle over 100 obstacles, from muddy trenches to climbing walls. Run solo or with a team for a day of muddy, physical fun.
7km Assault Course 10k

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The Summer Nuts Challenge

The Summer Nuts Challenge is a mud obstacle race taking place on a permanent course in Dorking, Surrey, near London. It is part of a series of events which also includes a Winter Nuts and a Colour Challenge. The event organizer is described as a pioneer with over 25 years of experience in obstacle course racing (OCR).

The course features over 100 natural and man-made obstacles, including mud trenches, water obstacles, climbing structures, walls, cargo nets, and tunnels. It offers a choice of distances: a 5 km and a 10 km option. Participants can run multiple laps if they choose.

The event is open to individuals, teams, and charity runners. Participants receive a free race vest or t-shirt and have access to a free key drop. The course is updated annually with new layouts and obstacles. Visit the organization's website for the most recent information.

10 km
10k
7 km
7km Assault Course
5 km