Grafham Water Trail Races 2026

Grafham Water Trail Races offer 10K and half marathon trail races starting at Marlow Park, adjacent to Grafham Water in Cambridgeshire. The event features marked and marshalled courses on tracks, bridleways, and country paths, supported by water stations and on-course first aid. The 10K is suitable for those new to trail running, and the half marathon provides a longer run around the reservoir. The courses consist of wide, runnable trails with consistent terrain, emphasizing steady pacing and off-road running rather than technical ascents. The half marathon completes a larger circuit of Grafham Water, incorporating parts of the Three Shires Way, offering open reservoir vistas and tranquil countryside sections. All finishers get a medal, and top runners contend for awards.