Immerse yourself in the scenic beauty of Cambridgeshire with the Grafham Water Trail Races, featuring both 10k and half marathon distances. Starting at Marlow Park, these races offer runners an unforgettable journey through some of England's most picturesque countryside. The 10k race is designed to introduce trail running enthusiasts to this unique terrain while offering a perfect challenge for beginners. The route winds along the Three Shires Way bridleway before looping back towards the finish line at Marlow Park, providing stunning views of Grafham Water and its surrounding landscapes. For those looking to push their limits further, the half marathon extends beyond the 10k loop with an additional lap around the reservoir, offering more miles on varied trails. Both races are fully marked and marshaled for safety and ease of navigation through Cambridgeshire's rolling hills and lush greenery. Participants must be at least 16 years old for the 10k and 17 for the half marathon, with a race cut-off time of four hours to ensure everyone can enjoy the experience without undue pressure. Registration opens early on race day, allowing runners ample time to collect their bibs and timing chips before setting off. The half marathon starts at 9:00 AM, followed by the 10k starting line-up just fifteen minutes later. Along both routes, you'll find water stations strategically placed for hydration needs. Trail shoes or footwear with good traction are recommended due to the nature of the terrain. Participants should also carry a fully charged mobile phone and their own reusable cup as part of mandatory items. Race organizers encourage runners to dress appropriately based on weather conditions by considering additional gear like waterproof jackets, long-sleeved base layers, hats, and gloves. Upon crossing the finish line at Marlow Park, all participants will receive an exclusive race medal while top male and female finishers in each category can look forward to special prizes. Free digital photos of your race day performance are available for download shortly after the event through Race Harborough's Facebook page. Support from friends and family is best enjoyed along the tracks at Grafham Water, ensuring minimal disruption to local communities. As a charity initiative, every entrant has the opportunity to contribute towards supporting the Jubilee Foodbank in Market Harborough and the Weston Favell Centre Foodbank in Northampton, helping those in need within our community. Join us for an exhilarating day of running amidst nature's splendor at Grafham Water Trail Races.
Races Offered
10k 2026
Oct 11, 2026
straighten
Distance —
10K
terrain
Type —
Running
timer
42 days remaining
sell
£25.00
Half Marathon 2026
Oct 11, 2026
straighten
Distance —
21.1K
terrain
Type —
Running
timer
42 days remaining
sell
£30.00
Weather History
These values represent the 3-year monthly averages for October in Huntingdon.
thermostatTemperature
8.9° / 15.3°
wb_sunnyFeels like
5.7° / 12.4°
light_mode
Avg sunshine hours
5h 37m
water_drop
Avg rainfall
2.5 mm
ac_unit
Avg snowfall
—
air
Avg wind speed
15.1 km/h (Gentle breeze)
opacity
Sweat loss rate
Low
terrain
Course conditions
Firm and slightly soft
sunny
Max UV Index
Low (2.8)
humidity_mid
Humidity
83.4%
wb_twilight
Sunrise
07:28
nightlight
Sunset
18:04
About Huntingdon
Learn more about the host city, Huntingdon.
Huntingdon is a sleepy historic town in Cambridgeshire, England, on the banks of the River Ouse, best known as the birthplace of English Civil War leader Oliver Cromwell.