Nuclear Fallout OCR Races
The Nuclear Fallout OCR Races in Brentwood, Essex on 7 November 2026 includes a 6km or 12km obstacle race, plus a 24km endurance OCR.
The 6km (40+ obstacles) is a 1-lap course and the 12km distance is 2 laps of the 6km course. Both are chip-timed. Attempt as many or as few obstacles as you like.
The Oblivion Maxx 24km is an advanced level endurance OCR with competitors completing 3 laps of a 6km course of with 70+ obstacles per lap.
Expect a wide range of natural and man-made obstacles over rugged farmland, woodland, lakes, and muddy terrain.
Organiser
Distances/Events
Mud / OCR:
6K with 40+ obstacles (14 years+)
12K with 70+ obstacles (17 years+)
Fallout Oblivion Maxx:
24K with 200+ obstacles (17 years+)
Source: https://www.runningcalendar.co.uk/event/nuclear-fallout-obstacle-races/
Event Website: https://nuclear-races.co.uk/nuclear-races/nuclear-fallout/
Coordinates: 51.6717871, 0.2639672