Nuclear FALLOUT
Experience the ultimate challenge at Nuclear Fallout, a true winter beast! Choose your distance on our award winning 6km or 12km lapped muddy obstacle course. Whether you’re a first-timer or a seasoned obstacle racer, the course is designed to be fun and challenging for all fitness levels. Expect a mix of natural and man-made muddy obstacles, from woodland and bogs to our famous Deathslide.
7th November 2026
Fallout – 6K
Muddy Obstacle Run
Easy
6km
Nuclear Fallout 6km is a thrilling, mid-distance challenge designed for those looking for a full-on obstacle adventure.
Participants tackle rugged farmland, woodland, lakes and mud with over 40 natural and man-made obstacles that test endurance, strength, and agility.
Chip-timed and suitable for all fitness levels, racers can walk, crawl or run at their own pace, with the emphasis on personal achievement and fun.
Every finisher receives a medal, making this 6 km course an exciting and rewarding experience for anyone seeking adventure without going ultra-distance.
What’s Included
- 40+ obstacles
- Hot washdowns
- Changing facilities
- Bouyancy aids available for water obstacles
- Free car park
- Finishers Medal
- Free finishers photo
- Free bag drop
- Chip timing
- Free spectators
- Under 16 year olds must be accompanied by a paying participating adult
Fallout – 12K
Muddy Obstacle Run
Intermediate
12km
Double the distance, double the challenge, Nuclear Fallout 12km is an endurance-packed obstacle challenge designed for seasoned and adventurous racers.
Covering rugged farmland, woodland, lakes, and muddy terrain, participants face over 70 natural and man-made obstacles that test strength, stamina, and determination.
Chip-timed, racers can tackle obstacles at their own pace, with no penalties for skipping them, ensuring the focus remains on personal achievement and fun.
Every finisher receives a medal, making this 12 km course a thrilling and rewarding adventure for those ready to push themselves further.
What’s Included
- 70+ obstacles
- Hot washdowns
- Changing facilities
- Bouyancy aids available for water obstacles
- Free car park
- Finishers Medal
- Free finishers photo
- Free bag drop
- Chip timing
- Free spectators
Fallout Oblivion MAXX – 24K+
Muddy Obstacle Run
Hard
24km+
The ultimate endurance obstacle challenge for seasoned and fearless racers!
Covering rugged farmland, woodland, lakes, and muddy terrain over three laps of 6km each, participants tackle 70+ high-intensity natural and man-made obstacles per lap.
Chip-timed with no penalties for skipped obstacles, the race is designed to test stamina, strength and mental toughness, while allowing racers to pace themselves and enjoy the adventure.
Every finisher receives a medal, making this extreme 24 km course a thrilling challenge for dedicated obstacle-racing enthusiasts.
What’s Included
- 200+ obstacles
- Chip timing
- Free finishers photo
- 24km Distance
- Water obstacles
Nuclear Offers
Award winning
Award‑winning obstacles on a permanent course, in a farmland setting including mud, woods, rivers and lakes.
Signature obstacles
Iconic signature obstacles, including the 20‑foot Deathslide, Travelator and a 15‑lane zip‑wire into water.
Races for all
A range of races which are inclusive of all fitness levels, abilities and ages.
Group and team friendly
Perfect for groups and teams to participate together and also offers the perfect opportunity for raising money for charity.
Event village
Friends or family can watch the race, enjoy music, food, drinks and merch in our spectator friendly event village while the action happens nearby.
Varied courses
Varied distances and formats including beginner friendly options.
TOP 10 FAQ's
How to find us
Nuclear Races is located in Brentwood, Essex just 15 minutes from the A12, M25 and M11.
By Train and taxi, we’re just 15 minutes from Brentwood station (on the mainline from Liverpool St) or 15 minutes from Epping Underground station.