Trail Running Calendar South East (England) 2026-2027

A 21.1 km off road trail race on 5 July 2026 along The Ridgeway between Wendover and Princes Risborough, with fully marked navigation, two aid station visits and a 4 hour limit.

Two off road races around Bewl Water on 5 July 2026: a 15 mile full round route including the nature reserve and a 5 mile out and back. Organised by Wadhurst Runners with on course marshals, post race cake and beer, and fundraising for KSSA..

Women-only trail running near Denbies Vineyard in Surrey offering 50 km, 25 km, 10 km and a 1 km kids loop. Routes are signed and supported with multiple aid stations and maps plus GPX files available.

Timed multi-lap road event on The Itchen Way in Winchester offering 2.62 mile laps, a seven hour running window, an American theme with costume trophies, and on-course aid with vegan options.

A flat 10 km trail run through the 325 hectare Thursley National Nature Reserve, featuring a recognised boardwalk and abundant wildlife. Suited to newcomers to trail running and runners seeking a social evening run.

The Phoenix Running - Slough will take place in Slough on Thursday 9 July 2026. You can run 5 miles.

A 7 hour timed event on a signed loop along the River Thames in Egham, with flexible self-directed distances from 3 km up to ultra and 50 km options. Finishers receive medals, goody bags and distance pins for longer distances.

Phoenix Fridays offers a flexible Friday run with a "rock up and go" start. Choose your distance on a flat, timed 5.3km loop along the Thames towpath. All finishers can pick from a selection of signature medals.

A trail ultramarathon from Lewknor to Avebury in Oxfordshire with 100 km and two 50 km stage options, following the Ridgeway through historic sites and offering pit stops, chip timing and basecamp facilities.

A fun run on an inflatable obstacle course in Southampton on 11 July 2026, with distances from 2.5k to 15k, music zones, on-course water, and a finisher's medal for participants.

Trail races from 8 km up to a 50 km ultra around Princes Risborough, using ancient beech woods, chalk downs and Ridgeway sections with marked routes and fuel outposts.

Enjoy a flexible timed running event along the flat River Thames towpath. Choose your distance from 5km to an ultra marathon and earn a bespoke spinning medal on this fast riverside course.

A 7-mile multi-terrain race through Knole Park with a chip-timed 3.5 km junior run for ages 9 to 15. Profits support The Running Charity and the event includes medals, free photos and prizes for top finishers.

A sold-out cross country 10k across the Ridgeway and Chiltern Hills with steep climbs and twisting single-track descents. Open to runners aged 16 and over and run under TRA and UK Athletics rules.

A four-race summer series at Dinton Pastures offering 5 km, 10 km and a 2 km kids event. Off-road, traffic free course with chip timing, medals, marshals and on-site support.

A weekend trail running festival in West Sussex offering 50 km and marathon options plus shorter runs and a 2 km family Flower Trail, with campsite and glamping, marked single-lap courses and stocked aid stations.

An evening trail race at Wendover Woods on 18 July 2026 supporting the Chilterns Neuro Centre. Options include 10 km, 5 km and an accessible 1.5 km loop, with marked trails, chip timing and a water stop on the 10 km route.

A weekend running festival at Blackland Farm on 18–19 July 2026 offering 1-mile lap formats: 24-hour and 12-hour solos, team relays, plus P24 and P12 paced challenges. Off-road course, camping included and limited Bell Tent upgrades.

MacTuffX Brighton at Withdean Stadium on 18 July 2026 combines ten prescribed Xercises with repeated runs in Classic and double distance formats, with solo, doubles and five person relay entries and a LITE weight division option.

Pretty Muddy 5k at Tilgate Park in Crawley is an obstacle course around Tilgate Lake with climbs, crawls and slides. The event raises funds for Cancer Research UK and offers on-site toilets, refreshments and parking.