Chiltern 50 Ultra Challenge 2027

Take on the Chiltern 50 Ultra Challenge and enjoy a stunning route through some of England’s finest countryside. Join over 1,000 Challengers taking on the distance as a walk, jog, or run, all whilst fundraising for charity and making a real difference.

Set out from basecamp in Henly and head north along historic trails and across rolling hills with fantastic views. You’ll travel on Shakespeare’s Way, the Chiltern Way, and the Icknield Way and through nature reserves known for deer and other classic English wildlife. Easily accessible from London, this is the perfect scenic day out on the trails for Challengers of all abilities.

Join as an individual or as a team and get ready to experience full support every step of the way. Regular Rest Stops packed with food & drink, hot meals, fully marked routes, massage & medical care, marshals on course and walking the route with you, and of course an unbeatable community. There are even camping & transfer options available so you can plan your whole weekend smoothly.

Join the UK’s #1 Series of treks & trail runs in 2027, and push yourself further with the Chiltern 50 Ultra Challenge.

All distance options have Charity and Self Fund options.

We'll provide you with a reason to keep going because you'll know that you're helping improve the lives of people living with cancer. 

Donations make up 98% of our annual income so we simply couldn't do what we do without you.

For full information on this challenge, please visit the Macmillan Cancer Support Ultra page. You can also find the FAQs here or contact the Action Challenge event organisers directly.

Please make sure you have read our Terms and Conditions before signing up.

By joining us you'll know that you're helping improve the lives of people living with cancer in the UK today.