Trail Running calendar near Harwell 2025-2026

The Frieth Hilly 5km & 10km is a challenging mixed-terrain running event held in the scenic Chiltern Hills near Frieth, between Marlow and Henley-on-Thames, about 35 miles from central London. The race features winding woodland paths and country roads, offering stunning views throughout the course...

Titsey Trail 10k is a single-lap, off-road 10-kilometre race through the Oxted Woodlands, Limpsfield Common and the High Chart area of Surrey and Kent. The largely forest-trail course uses tracks, footpaths and bridleways, with a brief 200m stretch along a country lane; it starts flat, climbs modera..

The Ridgeway Run is a challenging 15-kilometre (9.3 miles) trail race organized by Tring Running Club, featuring scenic routes mainly on footpaths and bridleways with stunning views of the Chilterns. The course starts near Tring, ascends through the Ashridge Estate past the Bridgewater Monument, fol..

Buckingham 10k is a charity running event in Buckingham Town Centre. The 10km multi-terrain route, organized by Run for the Sky, starts in the town centre and winds through Stowe Avenue, Stowe National Trust Gardens and farmland, offering a small-town atmosphere that blends urban and countryside sce..

South Downs Way Ultra Run is a 30-mile trail event in West Sussex, starting and finishing on Harting Down. The route highlights the best of the South Downs Way, including Beacon Hill, Cocking Down and Kingley Vale, with sections through ancient woodland and nature reserves as it reaches toward the s..

The Gatliff Marathon is a challenge walk, jog or run offering 25km or 50km distances through the Kent, Surrey and Sussex countryside, mostly on footpaths and tracks. Each year features a different route; entrants receive a route description and GPX file in advance. Organised by COPSE Club (Croydon),..

The Forest of Dean Ultra Marathon will take place in Coleford on Saturday 18 October 2025. You can run 34 miles.

The Maverick Jurassic Coast is a challenging trail running event held in Corfe Castle, Dorset, along the stunning Isle of Purbeck and part of the famous Jurassic Coast. Scheduled for October 18, 2025, it offers five distances: Ultra (102 km), Long (54 km), Middle (24 km), Short (12 km), and Sprint (..

Centurion Autumn 100 is a 100-mile continuous trail race based in Goring-on-Thames and Streatley. The course forms a cross from four 25-mile out-and-back spurs along the Thames Path and Ridgeway, converging at Goring. Legs run Thames Path to Little Wittenham, Ridgeway to Swyncombe Farm, Ridgeway to..

White Horse Gallop is a roughly 12K off-road run held at Leighton Recreation Centre in Westbury, Wiltshire. The course traces bridleways and portions of the Imber Range, culminating in a close-up view of the iconic Westbury White Horse. Part of the Wiltshire Off Road Race League, the event awards a..

Keynsham Dandy is a 12.5-mile off-road trail race organized by Town and Country Harriers (TACH). The event starts in Keynsham, between Bath and Bristol, at The New Inn. The course winds along rivers through rolling farmland and woods, reviving the Compton Dando route and including at least two strea..

The Viper 5 mile trail run (Autumn edition) is hosted by Multisport-Management in Ingatestone, United Kingdom, at The Viper on Mill Green Road. The 5-mile loop uses countryside paths on public rights of way, and is the same route as the spring edition but run in the dark. It's a small-capacity, self..

The Giddy Horse Half Marathon, Trail, & Steeplechase Obstacle Course Races take place at Chepstow Racecourse in the UK. The event features a variety of distances including a half marathon, 8-mile and 4-mile trail runs, as well as 4-mile and 8-mile steeplechase obstacle course races. The trail races..

The Giddy Horse Backyard 2025 is a running event held at Chepstow Racecourse, UK, featuring races around Piercefield Park. The course is a 4.167-mile loop combining woodland, parkland, and tarmac trails, mostly flat with gentle elevation changes. The event offers solo races of 8-hour (33 miles) and..

Running Tribe Races take place in Chalfont St Peter, Buckinghamshire, at two locations: Chalfont Park Sports Club and Chalfont St. Peter Community Centre. The event offers flexible distances ranging from 7k up to an ultra marathon, with looped courses of 7k, 10k, or 10.8k that allow participants to..

The Epping Forest Wildwood Trail Series offers a scenic half marathon and 10K trail run set in the heart of Epping Forest near London. Scheduled for October 25, 2025, the event showcases the vibrant autumn colors and ancient woodland. Runners navigate a varied course featuring well-maintained paths,..

Thames Trail Ultra is a 47-mile point-to-point ultramarathon along England’s longest river, from Hawkwell House Hotel in Iffley to the YMCA Y Centre in Henley-on-Thames. The route follows the Thames Path and Ridgeway National Trails, offering a mix of cross-country trails, riverside paths, and a sma..

The Worcester Ring Run 2025 is a 23-mile clockwise loop around Worcester and Droitwich, starting at Droitwich Rugby Club, a brand-new venue for 2025. The route follows the Droitwich Canal to the Worcester & Birmingham Canal toward Diglis, crosses Diglis Bridge, passes Pitchcroft, then returns along..

Thames Path Trail Run takes place at Windsor Racecourse, Windsor, UK. The event offers two trail distances: 21km and 16km, with gentle elevation gains of about 66m and 50m respectively, along the scenic Thames riverbank and surrounding countryside. Runners begin at Windsor Racecourse and follow clea..

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..