Thunder Races

Flitwick, United Kingdom • 13 Mar 2027

Thunder Races

Thunder Races runs a series of trail and ultra events designed to make trail running welcoming and supportive. Events are fully marked and fully supported, with generous cut-offs, volunteers, and on-course entertainment such as rave stations. The series focuses on clear waymarking and staffed aid so participants do not need to navigate alone.

Courses use runnable paths through countryside, villages, and rural tracks. Routes are described as mentally and physically manageable and are set up to reduce navigation stress. The format aims to work for people who are new to trail running and for those stepping up to longer distances.

Notable events and dates include:

  • 81-mile Pilgrim's Reckoning, circular ultra on the Bunyan Trail, Bedfordshire (24 hours)
  • 25 km Harrold Odell Trail Race, 13 March 2027, fully marked and supported
  • 50 km Harrold Odell Trail Race, 13 March 2027, fully marked and supported

Pilgrim's Reckoning follows the official Bunyan Way markers throughout and passes a mix of rural paths, villages, and open countryside. The event descriptions emphasize runnable terrain and support infrastructure so participants can focus on pacing and finishing within the stated time limits. Visit the organization's website for the most recent information.

Race information

50 km
Harrold Odell 50km Trail Race
25 km
Harrold Odell 25km Trail Race
Visit the organization's website for the most recent information.
Trail runs nearby

A 54 mile circular ultra and a 26.2 mile marathon section based at Brixworth Country Park, combining trails, roads and canal towpath with waymarking, checkpoint support and real time GeoTracks tracking.

Take on the Rosebud Marathon, a 26.2 mile stretch of the Rose of the Shires Ultra through scenic Northamptonshire trails, roads and canal tow path. Enjoy waymarked routes, on site support, a finisher medal and prizes for top runners.

An inflatable obstacle 5 km event in Huntingdon, Cambridgeshire on 11 April 2026, featuring a course of inflatable obstacles and recent strong booking activity. Past attendees noted a positive atmosphere.

Experience a guided marathon through the beautiful Chiltern Hills with expert navigation and support. Run iconic trails like the Ridgeway in a small group setting led by qualified leaders.

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