Grafham Water Trail Races | Half Marathon
Take on a glorious half marathon trail around a stunning reservoir — on a fully marked route with free race photos, and a medal waiting at the finish.
Sign up for £30
- Sun 11 Oct 2026
09:00
Age 17 & over
£30
- 13.1 miles trail running + 512 ft ascent
Event overview
Discover the stunning trails of Cambridgeshire at the Grafham Water Trail Races — fully marked, superbly organised races for all abilities, starting and finishing at scenic Marlow Park.
Choose your distance: the 10K offers the perfect trail-running debut, while the half marathon delivers a rewarding lap of one of the region's most beautiful reservoirs, using sections of the historic Three Shires Way bridleway.
Highlights
Spectacular reservoir scenery
Run alongside the sparkling waters of Grafham Water with panoramic views throughout.
Two distances for all abilities
Both distances are ideal for trail newcomers or those ready for a bigger challenge.
Iconic route on Three Shires Way
Follow sections of the Three Shires Way long-distance bridleway through peaceful Cambridgeshire countryside.
Stress-free experience
Fully marked course with professional first aid and multiple on-course water stations.
Rewarding finish
Every finisher receives a specially commissioned race medal, with prizes for the top three male and female finishers.
Free race photos
Download your race pictures at no extra cost after the event.
Race with purpose
Every entry supports the Jubilee Foodbank and Weston Favell Centre Foodbank.
This event is part of Grafham Water Trail Races.
Event photos
Event details
- Average fitness
- Beginner-friendly
- Dogs allowed at venue
- Event village
- Spectators
- Circular route
- First aid
- Marshals
- Mass start
- Undulating
- Water stations
- Way markers
- GPX available
GPX route
The route is displayed on the map above.
Overview
Lace up and explore the glorious Cambridgeshire countryside on fully marked trails around one of the region's most scenic reservoirs. Whether you're a newcomer or seasoned trail runner, this event is for you.
Starting and finishing at Marlow Park, both routes head west towards Easton, picking up bridleway trails with fantastic views across the water and surrounding landscape.
Route highlights
- Start and finish at Marlow Park, Grafham Water, a stunning lakeside setting
- Trails head west towards Easton, following sections of the Three Shires Way long-distance bridleway
- The 10K loops back on the outward track - ideal for those new to trail running
- The half marathon continues with a sweeping lap of the full reservoir
- Routes pass through quiet Cambridgeshire villages and open farmland
- Fantastic views across Grafham Water throughout
- Fully marked with arrow signs and marshalled throughout
- Water stations provided on course (three on the half marathon, one on the 10K)
- Cafe
- Paid parking
- Park
- Rural
- Toilets
Event HQ
Grafham Water Visitor Centre
Grafham
Huntingdon
Cambridgeshire
PE28 0BH
UK
- Drinks
- Medal
- Race photo
- Trophy
Included
- Fully marked course
- Marshalled route
- Professional first aid
- Water stations on course
- Water at the finish
- Finisher's medal
- Free race photos
- Top 3 prizes (male and female)
Sustainability
- Bring your own cup
- Age 17 & over
- Entries open
- Enter online
- Event merch available
- Race pack by email
Entry fees
Entry fee
£30.00
Other races at event
- Sun 11 Oct
- #2 of 2
09:15
Age 16 & over
£25
- 10 km trail running + 253 ft ascent