Challenge yourself with this 50km loop through Chiltern’s finest countryside
26 September 2026
Distance: 50km, 25km, or 10k
Price: Starting from £15
Events
Chiltern 50 Ultra Challenge®
Register your interest
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 to support our life-saving work.
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 & trail challenges!
Fancy something different? Check out more of our Ultra Challenge events
Contact us
If you have a question for us or would like to find out more about our events, our events team would be more than happy to help. Call us on +44 03331 881201 or email events@sja.org.uk.