Saturday 7th March 2026
Thunder Races is the most welcoming ultra series in the UK
Trail running should not feel intimidating. Thunder Races exists to make it welcoming, supportive, and genuinely fun. Across multiple events each year, we create fully marked, fully supported trail and ultra races designed for real people. Generous cut-offs, high-energy volunteers, and a feel-good atmosphere mean you can focus on running, not worrying.
Run together. Go further.
Welcoming trail vibes
Friendly faces, inclusive energy, rave stations, laughs, and volunteers who genuinely care. This is trail running built to feel supportive from the moment you arrive.
Fully marked.
Fully supported.
All you have to think about is running. No navigation stress and no being left alone. Perfect for first-timers and anyone stepping up in distance.
Beautiful, runnable courses
Lovely countryside and mentally and physically manageable routes. Designed to be challenging but manageable for first timers too.
Harrold Odell 25km Trail Race
Perfect if you are new to trail running or stepping off the road. Fully marked, fully supported, and designed to feel achievable and enjoyable, with generous cut-offs and runnable terrain that keeps things stress-free.
Harrold Odell 50km Trail Race
Ideal if you are ready to step up in distance. Fully marked, fully supported, and designed to feel achievable, with generous cut-offs and runnable terrain that rewards steady pacing and confidence.
Register for
Thunder Races
Ready to take on a trail challenge that feels welcoming, supportive, and genuinely fun? Choose your distance at Thunder Races and join one of the UK’s most approachable trail and ultra events.
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