Trail Running calendar near Harwell 2025-2026

Dash & Splash is a 5-kilometre fun run held along the scenic Sandown Bay on the Isle of Wight, starting at Shanklin Rowing Club and finishing at Yaverland near the Yaverland Sailing Club. The course features a unique route along the hard sand at low tide, navigating 43 groynes—most with wide gaps, w..

The Sunflower Stride is an exciting evening running event held in Dorchester, Dorset, featuring 5k and 10k races through stunning sunflower fields and scenic landscapes. Designed for runners of all abilities, the 5k is open to participants aged 13 and above, while the 10k welcomes those aged 16 and..

The Foxton Hound Ultra, held near Market Harborough, offers two challenging trail races of 100k and 50k distances through the scenic countryside of Northamptonshire and Leicestershire. The routes follow the Harborough Round long-distance footpath, passing through historic villages like Houghton on t..

The Admiral McHilly Trail is a challenging trail running event held in Chelmsford, Essex, featuring an approximately 15-mile course with significant elevation, including over 900 feet of climbing and descent concentrated in the middle section. The race follows a self-navigation format using a writte..

The Two Tunnels Races, scheduled for August 17, 2025, in Bath, UK, offer a unique running experience featuring the longest underground sections for each race distance in the UK. Participants can choose from various events, including an ultra marathon, marathon, half marathons, 10km, 5km, and family-..

The Big Pilgrimage is an exciting mixed terrain running event featuring a 15-mile course and a marathon, set to take place along the historic 'Old Way' Pilgrim Trail from Southampton to Canterbury. Participants will enjoy scenic views as they traverse beautiful coastal and countryside paths, with no..

The Firle 5km Handicap Trail Race is a scenic running event held at Firle Village Hall in the UK. This 5km out-and-back trail run features an undulating course primarily on hard trail paths with some quiet country lanes, offering beautiful views of the South Downs. The race uses a handicap format, w..

The Windsor & Eton 10km is a scenic multi-terrain trail run held in the historic town of Windsor, starting and finishing near the Windsor & Eton Brewery by the River Thames. The pancake-flat course covers 10 kilometers, featuring towpaths, footpaths, and short road sections through areas including t..

The Summer Green Man Ultra (GMU) is a challenging ultra marathon held near Bristol, UK, featuring two race distances: 45 miles and 30 miles. Both events run on the same course in a clockwise direction along the Community Forest Path, with the 45-mile race starting and finishing at Ashton Park School..

The Woldingham Marathon, held near Caterham, UK, offers both full (26.2 miles) and half (13.1 miles) marathon distances on a scenic out-and-back course starting at Woldingham School. The route features a challenging mix of private roads, woodland trails, and countryside paths, including sections alo..

Run Winchcombe is a family-friendly running event held at the historic Sudeley Castle in Winchcombe. The event offers three race distances: a 1k for children under 11, a 5k for ages 11 and over, and a 10k for participants aged 16 and above. The courses feature scenic routes around the castle grounds..

The Pershore Plum 10k is a chip-timed, multi-terrain flat 10-kilometer race held in Pershore, Worcestershire. Starting at Pershore Leisure Centre, the course runs through Pershore High Street, crosses the river, and passes through the surrounding countryside near Wick before finishing in Abbey Park..

The Chelmsford Brew Co Summer August Ale Trail 10K is a fun, charity-focused running event held at Brewery Fields, Great Baddow, Chelmsford. Scheduled for August 28, 2025, the 10K course is a GPX/Strava route with a narrative guide, emphasizing enjoyment over competition. Participants receive a drin..

The London Backyard Ultra is a unique endurance running event held at Frylands Wood Scout Outdoor Centre in Croydon, London. Participants run a four-mile loop every hour on the hour, continuing until only one runner remains, testing their true limits. The event offers a challenging yet supportive at..

The Mendip Marauder is a challenging ultra running event held in Somerset, England, featuring two distances: a 30-mile and a 50-mile race. The 30-miler covers the entire West Mendip Way, while the 50-miler includes the East Mendip Way before joining the 30-mile route. The course is notably hilly, wi..

The Henley River Half Marathon, 10k & Juniors event takes place in Henley-on-Thames, UK, on August 30, 2025. This scenic trail run is suitable for both new and experienced runners, featuring routes around Henley-on-Thames with views starting and finishing at Temple Island Meadows, the Royal Henley R..

The Ross on Wye 10K Riverbank Run is a popular running event held in Ross-on-Wye, Herefordshire, featuring chip-timed 10K and 5K races along with a family fun run. The course is flat and multi-terrain, running alongside the scenic River Wye, incorporating river paths with grass and mud sections. The..

The Southampton Running Festival, held on August 31, 2025, takes place at Southampton Common, a scenic green space in the city center known for its woodland, grassland, ponds, wetlands, and lakes. The event offers multiple race distances including a 5K, 10K, half marathon, and a junior race, with co..

The T184 is a challenging 184-mile self-supported adventure race following the River Thames from its source near Cirencester to the Thames Barrier in London. Participants navigate through scenic towns, villages, and iconic London landmarks, completing the course within 76 hours. The route alternates..

The 2nd Galloping Grind 10k Trail Run takes place in Boreham, Essex, at Orchards, Damases Lane. This dusk race features a predominantly anti-clockwise trail course, with a new route introduced for 2025. Participants are advised to wear high-visibility or reflective clothing and carry mobile phones f..