Trail Running calendar near Harwell 2026-2027

A flexible 6-hour timed run along the flat Jubilee River towpath. Run one 5.24-mile lap or see how many you can complete. The scenic route passes through countryside with views towards Windsor Castle.

A six hour trail event at Sence Valley Forestry Park on a **3.3-mile** hilly loop; participants complete as many laps as they can within the time limit. Canicross and rucking are permitted, and entrants may choose a medal or a tree-planting..

An ultramarathon at Turvey House where runners repeat a 4.167 mile loop every hour. Solo, paired, and time capped options are available, with chip timing, an aid station, first aid, porta loos, and prizes.

At Cheltenham Racecourse on Saturday 10 October 2026, the Inflatable 5K offers 2.5 km, 5 km, 10 km and 15 km lap options with giant inflatables, music zones and finishers medals. Children 5 to 15 must run with a paying adult.

Experience the iconic trails of Surrey with a choice of three distances through woodland paths and ridgelines. Enjoy a chip timed challenge featuring elevation and scenic views at Box Hill.

A 55 km circular trail in the Forest of Dean that requires GPX navigation across single track, ridges and riverside sections. The event offers staffed aid stations, canicross category, support vehicles and a finishers medal.

A guided trail half marathon in the Chiltern Hills covering about 13 miles with 300 m of ascent. Groups are led by qualified Run Leaders, there is a stocked refreshment point and participants receive a finisher's medal.

Fortitude Ultra at Pippingford Park is a 10 hour, 10 lap endurance challenge on roughly 3, 4 and 5 mile loops with up to 215 m elevation per lap. Finishing grade is set by the shortest loop completed and entrants receive a medal and shirt.

A half marathon and 10K through Epping Forest, London on 10 October 2026, run on marked woodland trails with aid stations, chip timing and an eco friendly focus.

A military style obstacle mud run at Hever Castle on 10 and 11 October 2026 offering 3K, 6K and 12K routes with replica Commando obstacles, an event village and a 2-hour survival experience.

Choose a scenic 10k or shorter 5k through the Chiltern Hills around Frieth, combining woodland paths and country roads. Expect rolling climbs and panoramic views for a rewarding, hilly challenge for road and trail runners.

A trail race on 11 October 2026 covering about 6 miles through an AONB near Doward and Ross-on-Wye, featuring single track, woodland, riverbanks and a notable hill climb, with marshals, a water station and limited entry for runners aged 17..

The Titsey Trail 10k is a community running event held on Sunday, 11th October 2026. Organized by runners for runners, it raises funds for a variety of local charities.

Trail races at Grafham Water from Marlow Park with fully marked 10k and half marathon routes, water stations and on-course first aid. Entries priced at £25 and £30, minimum ages apply, and all finishers receive a medal.

The FOOBS Trail and Fun Runs return in October. Choose from a chip timed 10K, 6K, or a family friendly 2K fun run through the countryside near Old Basing. The event supports local schools through community fundraising.

MacTuffX Swindon features a series of repetition based running formats including solo and team categories. Participants choose between multiple 400m or 800m loops in this structured athletic event for adults.

A community off road running event in Marshfield on Sunday 11 October 2026 with children's and adult distances. Entries support Marshfield Primary School and the routes use temporary access across private land.

A nighttime backyard ultra from Vigo Rugby Club that sends runners repeatedly on a 4.167 mile loop, starting each hour. Options include an open-ended Backyard Ultra or a 7 hour Challenge, with buckle and medal awards plus a team prize.

Trail races on 17 October 2026 around the Isle of Purbeck and part of the Jurassic Coast, with a **102 km** ultra and a **54 km** ultra, marked courses, outposts and mandatory safety kit for each distance.

A 100 mile trail race from Goring and Streatley using Thames Path and Ridgeway in four 25 mile out and back legs. The course has 16 aid stations, a 28 hour cut off and mandatory qualifying entry standards.