Chiltern 50 Ultra Challenge

This 50km looped route covers some of the best of the Chilterns countryside. You can walk, jog, or run along historic trails and over rolling hills. Starting & finishing at our Base Camp in Henley-on-Thames, there's a Saturday night celebration BBQ and entertainment with camping options.

Passing through nature reserves, forests, and a few hills with great views - it's a route with real variety, and some wonderful scenery - and it's all easily accessible from London.
With 25km options also - there's a Chiltern Challenge here for everyone!

Your entry includes free food and drink at regular rest stops, plus support including medics, marshals and massage. As you cross the finish line, you’ll get a glass of fizz, t-shirt, and a medal to commemorate your achievement.

How to enter the Chiltern Ultra Challenge

Use code MAC for 25% off your Charity Place registration fee.

Charity Sponsorship - pay a small registration fee and do lots of fundraising

• 50km Challenge - £20 registration fee + £395 fundraising pledge
• 25km Challenge - £10 registration fee + £250 fundraising pledge

Mixed Funding - pay a higher registration fee and fundraise less

• 50km Challenge - £72.50 registration fee + £218 fundraising pledge
• 25km Challenge - £45 registration fee + £135 fundraising pledge

Self Fund - you pay the full cost of the event place, fundraise whatever you want, with no set target or deadline

• 50km Challenge - £129 registration fee
• 25km Challenge - £79 registration fee

For full details and to sign up, visit the Chiltern 50 Challenge website.

You'll get full support and hospitality all the way, leaving you to focus on your challenge.

• Join as an individual or team
• 50km and 25km challenge options
• Walk at your own pace
• Covered rest stops
• Fully signed route
• Free food and drink
• Camping options available
• Experienced medical support
• Shuttle buses to local transport
• Ultra Challenge mobile app
• Medal, t-shirt and a glass of bubbly when you finish

How we'll support you

As part of Team Macmillan, you'll receive:

• First class support from the Macmillan Hiking Team, from sign up right through to when you cross the finish line
• A free Macmillan top, plus iron-on letters to customise your kit
• A digital fundraising pack bursting with fundraising tips and tricks
• Training support to get you ready for your challenge
• E-newsletters to keep you up-to-date
• An exclusive Team Macmillan Hiking Facebook group to meet your teammates

Most importantly, 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 Chiltern 50 website. You can also read the FAQs.

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

Visually impaired participants are welcome and usually take part with someone supporting them on route. There may be a discounted charge for this to cover event costs such as food etc. Event sites are generally in playing fields or outdoor areas on flat land. For spectators, there is limited wheelchair access and this can vary on the day depending on ground conditions.

For more details, please speak to the Action Challenge team who will be happy to discuss course suitability for your accessibility requirements.

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