Next edition - 5th April 2025
A 100K ultra marathon along the best and most loved trails within the Chiltern Hills.
Our debut 100K event will take place in Spring 2025 on a route that combines the most loved trails and landmarks within the central Chiltern Hills.
The event base and exact route are still to be confirmed, however a priliminary course can be viewed below.
Race held under UKA rules.