Trail Running calendar near Harwell 2026-2027

A 5k muddy obstacle course at Kempton Park Racecourse on 04 July 2026 featuring climb, crawl and slide obstacles. Entry fees and a minimum fundraising target apply; facilities include parking, toilets and on-site accessibility support.

A 24 hour challenge on a 1 mile loop at Nuneaton Harriers track where runners complete one mile each hour for 24 consecutive hours, with a substantial finisher's medal for completers and limited attended places.

Experience a chip timed multi terrain race through the picturesque country roads and bridleways of Willingham. Choose between 10km and 4 mile routes followed by fun races for children at the local recreation ground.

A 21.1 km off‑road half marathon along The Ridgeway between Wendover and Princes Risborough, featuring 526 m of ascent, two repeated aid stations, full route marking and a 4 hour time limit.

Community road races of 10 km, 5 km and a 1 km youth race at Jobbers Wood near Much Hadham on 5 July 2026. Organised by The Bishop's Stortford High School as a fundraiser with chip timing, finisher T shirts and age group trophies.

A women only trail event at Denbies Wine Estate in Surrey on 5 July 2026 offering 50K, 25K, 10K and a kids race. No cut offs and options for in person or virtual participation, with profits supporting the SheRACES mission.

Trail races of 5, 10 and 15 miles take place at Moors Valley Country Park on 5 July 2026, with chip timing, feed stations and medical support. Entry fees range from £25 to £30.

A six hour endurance run on a scenic 5k loop at Marston Lodge in Marston Trussell. Fully chip timed with solo, pair, and team entry options so runners complete as many laps as they can in six hours.

Experience a 6 mile trail run through the Bromsgrove countryside featuring woodland paths and rolling hills. Starting at Sanders Park, this off road adventure offers a scenic route with medals for all finishers.

Ware Festival of Running stages a 10 mile, a 10k and children's races along the River Lee Navigation on Sunday 5 July 2026, with all proceeds to Essex & Herts Air Ambulance and adult finishers receiving a T-shirt and medal.

A Pretty Muddy 5k obstacle event at Fairlands Valley Park with mixed terrain, staggered wave starts and on-site facilities. Participants must be 13 or older and receive event support plus a finisher medal.

An evening 10 km trail run through Thursley National Nature Reserve, crossing heathland, bog and woodland and featuring the boardwalk named Britain's Favourite Path. The event is organised by Running Adventures and is aimed at trail newcome..

Race 4 of the Northants 5K Series takes place at Fermyn Woods Country Park on 8 July 2026, featuring a multi-terrain 5 km route through ancient woodland. Limited paid parking is available and series medals are awarded to finishers.

Experience an off road 10 km single lap through the trails of Wyre Forest in this summer evening race. This inclusive event welcomes canicross runners and offers a focused racing environment starting from the Callow Hill Visitor Centre.

A 6-hour timed run along the flat Jubilee River in Slough on July 9, 2026. Participants complete laps of 5.24 miles, choosing their own distance. Every finisher gets a medal.

A 10 km summer evening trail race at Coombe Abbey Park, run over two laps through woodland and meadow with water stations, basic facilities and an option for a tree-planting token instead of a medal.

A six-hour trail event at Coombe Abbey Park where entrants run as many 3.3-mile laps as they wish within the time limit. The course mixes stone paths, meadow and woodland and offers parking, on-site facilities and optional charity support.

A seven hour timed event on a looped course beside the River Thames on 10 July 2026. Runners can choose distances from 3 km up to ultra and receive medals, goody bags and on course aid.

Phoenix Fridays offers a flexible Friday run with a "rock up and go" start. Choose your distance on a flat, timed 5.3km loop along the Thames towpath. All finishers can pick from a selection of signature medals.

Hazelbury Hurrah! is a Friday evening multi terrain race near Corsham on 10 July 2026, featuring a six mile main race and a two kilometre junior race. The event supports local charities and is Trail Running Association licensed.