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 Garden House Hospice Care. A basecamp 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 and drink, optional camping and transfers, a special medal, t-shirt and celebration finish. With 25km and 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 and trail challenges.

Walk, jog or run

50km, 25km, 10km options

Food and drink

Medal and t-shirt

New Year Deal: Sign up in January and get 50% off standard reg fees!

Register on the Ultra Challenge website

View the 2026 Ultra Challenge calendar