Trail Running calendar near Harwell 2026-2027

Tour of the Woods on 19 July at Knightwood Leisure Centre is a 10 km mixed terrain run split into five stages, with chip timing, prizes and a kids Twiglet Tour. Portions of proceeds support the Woodland Trust.

A muddy 5k obstacle event at Hylands Park, Chelmsford on 19 July 2026 featuring climb, crawl and slide elements in staggered waves. Participants must be 13 or older and there is a minimum fundraising target of £50.

Enjoy a 10k trail run through Chelmsford featuring a unique brewery checkpoint. This non competitive event includes mid race and finishers drinks along with a commemorative medal for all participants.

A 7 hour timed riverside challenge near Egham with flexible start options, themed medals from 3 km and goody bags for finishers. The signed course is mainly on paths and tarmac with aid stations each lap.

A Friday series on a flat 5.3 km out and back course along the Thames, offering distances from 5 km to ultra and timed laps within a seven hour limit. Spinning Rubber Ducky and bespoke finisher medals are available.

A 100 mile ultramarathon across the Brecon Beacons following the Beacons Way National Trail with 6,143 m of ascent, ten checkpoints and mandatory map and compass navigation. Live GPS tracking is provided and the race carries UTMB and ITRA p..

A family friendly inflatable obstacle fun run in Coventry on 25 July 2026, with giant inflatables, five music zones and choices of 2.5k, 5k, 10k or 15k laps. Participants receive a finisher medal and on-site food and facilities are provided..

Test your stamina at MacTuffX Birmingham through a series of timed interval repetitions. Choose between solo, doubles, or relay categories across ten sets of 400 or 800 meters in this high energy summer event.

A timed, lap format run along The Itchen Way in Winchester with a professionally measured, permitted course. Runners may complete multiple 2.62 mile laps up to ultra distance and receive a bespoke finisher's medal and aid station provisions..

A Pretty Muddy 5k obstacle event at Priory Park in Bedford where participants climb, crawl and slide around a grass and tarmac course in staggered waves. The event has a minimum fundraising target of £50 and separate adult and child entry f..

Trail running from Queen Elizabeth Country Park across the South Downs with *50K*, *25K* and *12K* options on 26 July 2026. The event is TRA licensed and includes marked routes, aid stations and on site facilities.

A daytime trail event at Denbies Wine Estate in the Surrey Hills offering marathon, half marathon, 10K with canic races and 1K/2K kids races; the marathon requires self navigation and all checkpoints must be reached.

A circular half marathon on the Ridgeway that passes National Trust sites Ashdown House and the original White Horse Hill; the route is undulating and the race is held under UK Athletics rules with a Trail Running Association permit.

Flat trail races at Summerleaze Park on 26 July 2026, offering 5K, 10K and a Half Marathon with marked routes, marshals, chip timing and post-race goodies.

Timed laps on a 2.62 mile out and back canal route with flexible distance options from 5 km up to ultra and a seven hour time limit. Both in person and virtual entries receive a physical medal.

A 5 mile undulating trail run on 26 July 2026 around Bembridge, passing marshes, copse and coastal path. Entry is limited to 180 runners with trophies in Seniors, V40 and V55 categories and medals for all finishers.

A looped trail event from Guildford across the North Downs in Surrey offering 50 km, 25 km and 10 km options with covered rest stops, GPS tracking, medical support, camping and shuttle transfers, plus a finishers medal and t shirt.

A family friendly inflatable obstacle run in Bournemouth on 1 August 2026 with multiple distance options, giant inflatables, finishers medals and on-site facilities for participants and spectators.

Interval-based running event in London on 1 August 2026 offering 10x400m and 10x800m formats. Categories include solo, doubles and relay entries with fees from £65 to £165; all entrants must be 18 or older.

Third race of the Forest Five mile series on 1 August 2026, held as Orion Harriers' ELVIS fixture. The event awards individual and team trophies and offers a discounted series rate with age-category aggregate prizes.