Trail Running calendar near Caldecotte Lake 2026-2027

Race one of the AWT Backyard Ultra Series in Ruislip on 9 August 2026 uses six hourly 5 km laps for a total of 30 km. Entry is free and the event is held in person with free parking.

A guided 16k trail run at High Lodge in Thetford Forest with forest facts and practical trail running tips. Runs are led at a conversational pace and groups are matched by ability to help participants enjoy the woodland routes.

A butterfly themed event at Shipley Country Park on 9 August featuring the Purple Emperor and a commemorative medal priced at £41.50.

An informal, untimed 6 mile group run around Croome Park on a single multi terrain lap with refreshments and proceeds to the National Trust.

Race 5 of Pitsea RC's Crown to Crown series is a measured off road 5K at Westley Heights Country Park on 12 Aug 2026 featuring bridleway trails and onsite safety measures.

A sold out multi-terrain 5 km race at Fermyn Woods Country Park on 12 August 2026 with bespoke medals, limited parking, and a virtual completion option.

Four-event summer series at Dinton Pastures offering 5 km, 10 km and a 2 km kids race on a flat off road traffic free course with chip timing and medals.

Midweek Chasing Numbers at The Last Hop in Staines is a flexible seven hour time challenge along the River Thames with distances from 3 km up to 50 km and ultra options.

Seven hour timed event on the River Thames near Egham offering flexible distances from 3 km up to 50 km, with medals, goody bags and aid stations.

Two TRA licensed trail ultras of 50k and 100k around Market Harborough with GPX navigation, checkpoints, on course aid and tracking.

This timed event on August 15, 2026, offers a flexible, multi-lap format on a smooth riverside course in Winchester. Runners can choose their start time and distance, from a single lap to an ultra marathon, within a 7-hour window. All finis..

A guided 10 km trail run through the Chiltern Hills finishing with a brewery tour and tasting at Tring Brewery, including a drink and on‑site pizza options.

An obstacle day at Forest Facility near Stamford with a 4 mile loop of about 60 obstacles, a 1.5 mile family wave and proceeds supporting rainforest conservation.

Obstacle course races at Badminton Estate on 16 August 2026, with Sprint 5 km, Super 10 km, Beast 21 km plus a kids race and spectator options.

Off road half marathon in Henfield on 16 August 2026 with riverside and disused railway sections, flint paths and stiles; facilities include changing rooms and free parking.

A 10 km multi-terrain trail run at Ramsbury Brewery on August 16, 2026, with a canicross option. Entries include chip timing, a medal, race photos and a pint cup with a free alcoholic or non-alcoholic drink.

Trail 10k and new 5k around the Malvern Hills foothills with finisher medals, prizes, field parking and a two hour cut off.

A six hour looped trail challenge around Holme Pierrepont Country Park and Watersports Centre with roughly 5.44 km laps on a mainly flat, muddy course.

A guided social trail run on a 10 mile loop through the ancient droves of Mildenhall and Lakenheath, with run leaders, scenic stops and post run refreshments.

Evening trail events in Chelmsford on 17 Aug 2026 offering a 10 km trail run, a 10 km social hike and a timed 15 km hike supporting the British Heart Foundation.