Trail Running calendar near Harwell 2025-2026

Serpent Trail Ultra Run is a 30-mile trail event starting and finishing in Haslemere, Surrey. It showcases the best parts of the Serpent Trail and the Sussex Border Path, with a hilly profile that includes climbs toward Blackdown and a stop at the Temple of the Winds lookout for views over the South..

The New Forest Stinger is an annual 10-mile trail running event held in the scenic New Forest at Ocknell Campsite, Fritham. Organized by Totton Running Club, the race features an undulating off-road course that follows approved trails and paths, offering some of the best views in the forest. The eve..

DirtRun In The Dark is an off-road running event held at The Wyre Forest, Callow Hill Visitor Centre. Participants tackle a 10km course consisting of two laps around forest tracks and trails, all run in the dark, making torches compulsory. The race welcomes runners aged 14 and above and allows canic..

The Wallop is a scenic 21k trail run held within the Farleigh Wallop Estate in Hampshire. The course features a diverse mix of narrow woodland paths and wide gravel tracks that wind through forests and open land, offering runners an immersive natural experience. This half-marathon event is fully mar..

The The Maverick Exposure Lights Dark Oxfordshire will take place in Stonor on Saturday 29 November 2025. This trail is organized by Maverick Race. You can run between 7 and 17 kilometers.

Box Hill Vertical KM is a guided trail run held around Box Hill near Dorking, Surrey. The course covers about 12.5 miles with around 1000m of elevation, designed to rack up significant height in a compact distance. It traverses woodland, heathland and open fields, with hills that are technical enoug..

The Maverick Original Oxfordshire is a trail running event held at the historic Stonor Park estate near Henley-on-Thames, Oxfordshire. Set within the Chilterns Area of Outstanding Natural Beauty, the race offers three challenging routes: 22 km (long), 12 km (middle), and 7 km (short), featuring elev..

Wittering Beach Run takes place at West Wittering Beach, near Chichester, UK. Runners choose from three distances—5km, 10km and 15km—along the expansive sandy flats revealed at low tide. The route offers long views of Selsey Bill and the Isle of Wight, plus Chichester Harbour, the Solent, and the So..

The Riverside Marathon & Half Marathon, organized by Phoenix Running, takes place in Walton on Thames, Surrey, along the scenic River Thames towpath. This UK Athletics certified event features flat, fast, and accurately measured courses with no elevation gain, ideal for runners seeking personal best..

The 12th Colworth Hare and Tortoise Run is a 26.3-mile, five-lap event around Colworth Estate in North Bedfordshire. Starting from Colworth House Sports and Social Club in Sharnbrook (MK44 1LB), the route combines undulating trail and unclassified roads with woodland paths featuring uneven surfaces..

Surrey Hills Half Marathon is a guided trail half marathon starting and finishing in Guildford, Surrey. The 13-mile route threads through the Surrey Hills’ scenery, including St Martha’s Church and hill, the village of Shere, and Newlands Corner and Hackhurst Downs, with sections of the North Downs..

Sussex Downs Trail Run takes place at Plumpton Racecourse in the South Downs National Park, Mid-Sussex, with easy access from Brighton, Haywards Heath, and Lewes. The event offers three distances: 22km, 12km, and 9km. The course starts with a flat 3.5km tree-lined warm-up, then climbs to the South D..

Endurancelife Dorset runs in Swanage along the Jurassic Coast Path, a World Heritage-listed coastline since 2001. The event offers four distances—10K (6 miles), half marathon (13.1 miles), marathon (27 miles), and ultra (37.2 miles)—with substantial climbs (774, 1,719, 4,692, 7,027 ft) on an extreme..

Cowdray Winter Night Run is a 5km or 10km trail race on the Cowdray Estate in West Sussex. The routes traverse parkland and along the River Rother, with some private estate tracks; the course is mostly flat with a couple of gentle climbs. Runners start at the Cowdray Ruins and finish at the Walled G..

Freedom Racing's Hurtwood 50k is a 50-kilometre trail ultramarathon set in the well-known Surrey Hills. The route is a fully signed long-distance trail with extra race signage, designed as a fast, out-and-back course featuring a 5-mile loop for those up front. Competitors encounter regular checkpoin..

The Trifarm Winter Trail Run 10k is the final event in a four-round seasonal trail running series, held at Trifarm in Boreham, Essex. The course is predominantly off-road, covering over 95% on public footpaths and bridleways, and follows a mostly clockwise route designed to avoid flood-prone areas n..

The Chasewater Christmas Pudding Dash is a festive running event held at Chasewater Country Park in Staffordshire. Offering 10k, 5k, and junior race options, the course features mostly flat, slightly undulating compacted trails around the scenic Chasewater Reservoir. The 10k race consists of two lap..

The New Forest Xmas Trails is a festive trail running event hosted by BigFeat Events, set in the picturesque New Forest National Park. Participants can choose from four distances: 15K, 30K, Marathon, and 50K, all on challenging yet runnable off-road courses. The event begins at Holmesly Campsite, of..

The ATW Grafham Water Trail & Canicross is a scenic 10-mile trail running event held at Grafham Water Visitor Centre in Cambridgeshire. The course begins on the iconic dam, offering a fast start, then loops around the reservoir through woodland nature reserves, past Dragonfly Pond and Sanctuary Bay,..

The Mince Pie 10 is a festive 10-mile race held in Peacehaven, East Sussex, organized by Seaford Striders. The multi-terrain course features about six miles of farm tracks and bridleways, with the remaining four miles on quiet roads, including a challenging hill around mile six. Participants can exp..