Trail Running calendar near Harwell 2025-2026

The Guided Half Marathon - Winchester will take place in Winchester on Saturday 20 September 2025. You can run 13 miles.

The Yard Trail Races, hosted at Chilton Manor Farm in Hampshire, offers participants two scenic routes: a 10k and a 10-mile trail run. Both routes begin and end on a historic avenue lined with 800-year-old Yew trees, providing stunning views. Runners are welcomed at the finish line by friendly marsh..

Hambledon Hilly is a multi-distance trail running event at Hambledon Vineyard in Hampshire, England. The lineup includes 1km, 2km, 5km, 10km and 20km races, with age limits for each distance. The children’s races run inside the estate, while the longer races start and finish at the vineyard; the 20k..

The Conquest of Avalon is a scenic ultra running event held in Somerset, England, finishing in the legendary town of Glastonbury near the iconic Tor. It offers two distances: a 30-mile and a 50-mile race, both primarily following the historic Leland Trail with the 30-miler diverting onto the Lands E..

The Triple Trail Races, held at Loddington Farm in Kent, offer three challenging distances: 25km, 50km, and 100km, traversing Kent's iconic North Downs Way, Greensand Way, and Weald Way. The 100km race is a unique single-loop ultra marathon showcasing scenic countryside, historic landmarks like Leed..

Humanity Direct Tring Ultra is a one-day endurance event based at Tring Cricket Club in Hertfordshire, near London. Distances available: 50 km ultra, 27 km half ultra, and 10 km. Elevation gain: 135–597 m.The route showcases the Chilterns, including Ashridge Forest, the Grand Union Canal, and Wendov..

Centurion Running’s Chiltern Wonderland 50 is a 50-mile single-loop ultramarathon set in the Chiltern Hills, starting and finishing in Goring-on-Thames, Oxfordshire. The route climbs around 5,600 feet and traverses picturesque villages rich in history, including locations made famous by British film..

BigSky Trails (AIR) is the finale of BigFeat Events’ Classic Element Trail Series, held at Hyde Common, Frogham, Nr Fordingbridge in the New Forest National Park. It offers 18-mile and marathon distances, starting near Hyde Common as dawn breaks and guiding runners over wide open plains and winding..

BRJ Run & Tri presents the Ouse Valley Way Marathon and Half Marathon, held on 21 September 2025 in Huntingdonshire. The event follows the Ouse Valley, a scenic, flat route designed along grass, gravel and tarmac paths. The classic route runs from Earith to Eynesbury, offering river views and rural..

The Clipston Trail Half and Country 5 Miler is a scenic trail running event held in the countryside around Clipston, near Market Harborough. The event features two distances: a half marathon and a 5-mile race, ideal for both seasoned trail runners and beginners. The courses start and finish at Clips..

The Creative Juices 10km is a scenic trail running event held at Woodoaks Farm near Rickmansworth, home to the Creative Juices Brewing Company. The course is predominantly off-road, featuring woodlands, footpaths, and bridleways, making it suitable for all abilities. Runners start and finish at the..

The Mells Scenic Race is a 7-mile running event held in the historic village of Mells, near Frome. The course features a mix of footpaths, bridleways, cycle paths, and quiet country lanes, offering a scenic route with some hills. The 2025 race follows the 2023 route, including a stretch along the cy..

Cirencester AC’s Chedworth Roman Trail offers two trail races set in the Cotswold countryside near Cirencester, Gloucestershire. The 10-mile (ish) single loop and a newly added 5-mile (ish) loop pass through Stowell Park, the Coln Valley, and close to the Chedworth Roman Villa. It’s a challenging mu..

Phoenix Striders Dunton Demon Races return at Langdon Nature Discovery Park in Basildon, Essex. The event offers three race options: Dunton Demon 5 mile, Dunton Demon 5k, and Dunton Demon 1k/2k Tinnies Toddle for children. The challenging trails loop through Langdon Hills, with routes visiting lakes..

Manuden 10K, 5K and 1K takes place in Manuden, with the start/finish on Rickling Road near the Yew Tree pub. The event offers three distances: 10k and 5k routes that head off-road across fields, bridleways and footpaths, plus a 1k route for younger runners. Medals are awarded to all finishers, and w..

Trifarm 10k Autumn Trail Run is at Trifarm, Boreham, near Chelmsford, Essex. This 10-kilometre trail race is the third in the Trifarm series. The route is mostly off-road on public footpaths and bridleways, starting with a 3/4-lap of the on-site track and finishing near a bridge via a public path; t..

Silent Pool 10km is a guided trail run that starts and finishes at Silent Pool, Albury, near Guildford. The route follows North Downs Way sections and the Netley Heath forest, dipping into Shere and passing film locations from The Holiday and Bridget Jones Diary. It’s ideal for those new to trail ru..

Epic Epping Forest Ultra, organized by Orion Harriers, was planned as a 50-mile trail ultra in Epping Forest near Chingford, London. The course comprised ten 5-mile loops, totaling just over 50 miles with around 1,120 meters of ascent. Formats included a solo Ultra and Enduro teams (2 or 4 runners)...

The Fortitude Ultra - Denbies is an endurance running event held at the picturesque Denbies Wine Estate in Dorking, Surrey. Participants face the challenge of completing 10 laps of varying distances (approximately 3, 4, or 5 miles) within a 10-hour timeframe. Runners can adjust their chosen distance..

The Dark Downs 50k is an exciting night running event held on the scenic South Downs, featuring both a 50k race and a Half Marathon. Participants will experience the unique atmosphere of running at dusk and into the night, with the rolling hills and runnable trails providing an ideal setting. The ev..