The Chiltern 50 Ultra Challenge is a 50km looped challenge in some of the Chilterns’ finest countryside, with historic trails, rolling hills, nature reserves, with fantastic views.
Join up to 2,000 adventurers and take it on at your pace as a walk, jog, or run – and fundraise for Against Breast Cancer’s groundbreaking research into secondary spread breast cancer!
A base camp in Henley, and a route with real variety and some wonderful scenery – and easily accessible from London.
Sign up as an individual or as a team; you’ll get full support all the way, plenty of food & drink, optional camping & transfers, a special medal, T-shirt and celebration finish. With 25km & 10km options also available – there’s a Chilterns Challenge for everyone!
Push yourself further in 2026, take on an Ultra Challenge – the UK’s No.1 Series of treks & trail challenges!
Chiltern 50 Ultra Challenge Cost Options
- Sponsorship / Mixed Funding: Registration Fee + minimum sponsorship
- Own Place: Registration Fee + raise as much sponsorship as possible
EARLY BIRD DEAL ON – 25% off Standard Registration Fees with the Charity Sponsorship option if you sign up by the 31st October 2025. Use code 25%CHARITY at checkout.
For more information and to sign up click hereYou can also raise funds for Against Breast Cancer by taking part in one of the many other Ultra Challenge events that are available.