Trail Running calendar near Harwell 2025-2026

The Stort30 Ultra is a scenic 30-mile ultra marathon held on the border of Hertfordshire and Essex, starting and finishing at the Hockerill Sports and Social Club in Bishop's Stortford. The course follows a flat, fast out-and-back route along the River Stort and Lee navigation, primarily on grassy t..

Irchester Spooktacular is a Halloween-themed night-time running event at Irchester Country Park. Runners can choose between a 5k night run or a 2k Family Fun Run, both on established woodland trails with two new routes created for the event. The courses are fully marked and marshaled by witches, wiz..

The Guided Run - Petersfield 10k will take place in Petersfield on Saturday 1 November 2025. You can run 10 kilometers.

Brewery Trail Run is a 6-mile (10 km) trail run through the Chiltern Hills, starting from The Home Office in Tring, about 40 minutes northwest of London. The route traverses scenic trails with some hills, and participants are grouped by ability and may walk steep sections, making it suitable for all..

The Chiltern Ridge Winter 50K is a scenic autumn/winter trail running event held in Berkhamsted, UK. This ultra-distance race covers a challenging 50 kilometers with over 800 meters of elevation, following a single-loop course through the heart of the Chilterns. Runners traverse woodland trails, Ber..

The ZigZag Catherine Wheel Canter is a unique running event held at Wodson Park Sports and Leisure Centre in Ware, Hertfordshire. Participants can choose from various distances including 5k, 10k, half marathon, full marathon, 50k ultra, or a 6-hour challenge, all run on a traffic-free 400-meter athl..

The Fireworks 50 is a 50-mile running event organized by Zig Zag Running, held at Wodson Park Sports and Leisure Centre in Ware, Hertfordshire. Now in its fourth year, this unique race takes place on a traffic-free athletics track, offering runners a safe and controlled environment. Limited to 50 pa..

The Wendover Woods Marathon, Half Marathon & 10k is a scenic autumn trail running event held in Wendover Woods, Buckinghamshire. The race features multi-terrain, hilly courses with significant climbs, making it a challenging yet rewarding experience for novices, seasoned runners, and marathoners see..

Twmbarlwm Terror is a 7-mile multi-terrain race organised by Fairwater Runners Cwmbran in Risca, near Newport, South Wales. The route combines footpaths, open fields, country lanes and woodland from Risca Leisure Centre to the Twmbarlwm peak and back, with around 1,000 feet of total ascent. Now in i..

The Sphinx AC Coombe 8 – 2025 event is held at Coombe Abbey on the outskirts of Coventry, with the race HQ outside the main visitor centre. The main 8-mile race is a tough, multi-terrain course that combines wooded trails and undulating farmland across the historic site, with an optional 8 km (5 mil..

Tunnel Vision is the Everyone Active Night and Dawn Runs in Market Harborough. The out-and-back 5-mile race features the Oxendon Tunnel, 422m long, lit with mood lighting but still requiring a headtorch. The hard-packed track can be run in road or trail shoes, though the tunnel surface has ruts and..

Enigma Fireworks is a running event taking place on November 7th and 8th, 2025, at Caldecotte Lake in Milton Keynes. The event features both a marathon and a half marathon on each day, with participants completing scenic laps around the lake. Runners can expect a supportive environment with race bri..

The The Druid's Challenge will take place in Tring on Friday 7 November 2025. You can run 86 miles.

Big Night Out Winchester is an exciting night-time trail running event set in the scenic surroundings of Winchester, Hampshire. Participants can choose between a 22km or 12km course, both illuminated by headtorches as they navigate the trails and pathways. The event features a fully marked route wit..

South Downs Trail Run starts from Glorious Goodwood at Goodwood Racecourse in the South Downs National Park, with views across the downs and distant sights of the North Downs, Chichester Harbour and the Isle of Wight. Runners choose from three off-road distances: 21km, 19km and 12km. The course runs..

Freedom Racing stages the 5 Trails Ultra and 3 Trails Half at Westerlands, Graffham, near Petworth in the South Downs (GU28 0QJ). The day offers two distances: a 50km Ultra that weaves five long-distance trails—Serpent Trail, New Lipchis Way, West Sussex Literary Trail, Monarchs Way and the South Do..

The Dirt Half Challenge is a popular, award-winning half marathon trail race held in Leighton Buzzard, Bedfordshire. The course features a stunning and challenging route that begins in the historic market town and includes an anti-clockwise lap of Tiddenfoot Waterside Park. Runners then follow the s..

The Remembrance Day Run - South, hosted by Saturn Running, takes place in Surrey at the Wraysbury Skiff and Punting Club along the scenic River Thames in Egham. This 7-hour time challenge allows participants to run multiple laps of a 4.37-mile (7km) course, which features a mix of well-made paths, t..

MoRunning Bristol is held at Ashton Court Park in Bristol and includes 1.5k Mini MoRun for kids, plus 5k and 10k MoRuns. The route combines paths and trails with hills from 1km up to 3km; it’s dog-friendly and suitable for off-road buggies, though some sections may be muddy or bumpy and it isn’t whe..

Southampton MoRunning brings the MoRun experience to the Common in Southampton. Participants can choose from 1.5k Mini MoRun, 5k, 10k and a Half Marathon, all run on a mix of park paths, trails and grass with some undulating sections. The Half Marathon starts with a 1.1k loop before four full laps.T..