The UK's Most award winning muddy obstacle course
Escape the everyday and get stuck into our award-winning muddy obstacle course at Nuclear Races, Essex’s best mud run. From thrilling slip and slides and the iconic Travelator to mud pits and cargo nets, every obstacle delivers mud, fun and a genuine sense of achievement. Whether you’re a complete beginner, seasoned racer, endurance runner, adult or child, there’s a race for everyone.
Nuclear RUSH
8th-9th may 2027
- Various Distances
- 4 Years +
The ultimate obstacle racing weekend! Take on our 6K or 12K adult courses packed with over 70 obstacles including the famous Deathslide and zip lines. Bringing the kids? Families can tackle our exciting 1.5K, 3K, and 4K courses, making it a legendary muddy weekend for every age and ability!
Mud Tribe
4th September 2027
- Various Distances
- 4 Years +
Built purely for fun and teamwork rather than competition! Tackle our 1.5K, 5K, or 7K muddy obstacle courses, designed for all abilities. Whether you’re running as a family, corporate team, or fundraising group, get ready to dive through epic foam zones and conquer legendary mud together!
Nuclear FALLOUT
6th November 2027
- Various Distances
- 14 Years +
Tackle the Nuclear winter beast! Choose from our multi award winning 6K or 12K lapped course. Whether you’re a newbie, small group, big team, veteran or competitive endurance racer, Nuclear courses are thoughtfully designed to be challenging, fun and achievable for all ages and every fitness ability.
8th May 2027
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.
We had a great time at the Nuclear Races event in Brentwood. The event was well organised with friendly staff, good quality food/ drink trucks and a fun course that catered for all ability levels. Would definitely recommend!
Tim Flack (Level Up Gym)
Went to Nuclear Races for a corporate day out last week and had a really great time! Definitely a good event for team building and getting to know people better. The Nuclear Races team were super friendly and also more than happy to laugh at our attempts to cross the various obstacles…
Would highly recommend.
Nick Lane
Fantastic time at Nuclear Races! As a deaf person, I didn’t want to miss out, and have been wanting to try this challenge for years.. but was too nervous, since I wouldn’t have my hearing aids in! Plucked up the courage to join, and I was VERY impressed with how inclusive and thoughtful the team were. We had a bib system in place, so the marshals would know I was ‘the deaf one’! The marshals were all aware, and so friendly! There was even one who signed ‘applause” as I came round! Thank you to Sam for putting this all in place for me. I will be back next year for sure!
Anonymous
Great customer service from Sam who helped me move a family booking to an alternative date. Couldn’t have been more helpful.
Marc Clauson
Great obstacle race, friendly team that are quick to respond to queries and very helpful. The Marshals have always been top tier. A good, fun, muddy race with a bit of something for everyone
Ginger Lacey
Jorgia Weeks
How to find us
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.