About the 2026 Chiltern 50 Ultra Challenge
Experience the best of the Chilterns countryside on this epic, end of season trek!
Challenge yourself as you tackle this stunning looped route, soaking up the sights and sounds of the countryside. After a day of adventure, you'll celebrate with a Saturday night BBQ and live entertainment making it the perfect way to top off an unforgettable weekend.
How to get started
- Choose a distance that suits you: From 10km to an epic 50km - you can run, walk or jog this challenge at your own pace.
- Pick a fundraising option: You'll need to reach a minimum fundraising target based on what you choose.
- Sign up on the Ultra Challenge website: By taking part in support of CALM you’ll get 50% off your reg fee.
How we'll support you
Whether it’s your first time taking on the Chiltern Ultra Challenge or you’re back for more, we’re here to make sure you have the best time. As part of Team CALM you’ll receive:
A CALM t-shirt or vest so you look the part on the day
Dedicated support from the Challenge Events team
Access to the CALM Walking Club Facebook group
Tips and advice to help you smash your fundraising target
Event Accessibility
Visually impaired participants are welcome to take part. To discuss your accessibility needs, get in touch with the Action Challenge team who will be happy to help.
Got a question?
Check out our FAQs or head to the Chiltern 50 Ultra Challenge website. If you can’t find an answer there, get in touch and we’ll be happy to help.
