Hosted by Action Challenge, the 2026 Thames Path Ultra Challenge is fun, safe, and rewarding – with full support all the way, enabling you to push yourself further in wonderful historic scenery.

England’s greatest river provides a fantastic backdrop for an unforgettable challenge. Over 3,000 adventurers will join the Putney Bridge start, and the full 100km route heads upstream all the way to Henley along the famous Thames Towpath. This runs through Richmond, Hampton Court, Runnymede, and Windsor, with some wonderful historic scenery en-route, to a riverside finish line.

You’ll get full support and hospitality all the way. With 50km and 25km distance options also available, there’s a Thames Path Challenge for everyone!

Use code 25%CHARITY until 31 October 2025 for 25% off your registration fee.

Charity sponsorship

Pay a small registration fee and do lots of fundraising!

Full challenge 100km - £50 Reg Fee & min £575 fundraising/sponsorship3/4 challenge 75km - £45 Reg Fee & min £475 fundraising/sponsorship1/2 challenge 50km - £40 Reg Fee & min £375 fundraising/sponsorship1/4 challenge 25km - £30 Reg Fee & min £275 fundraising/sponsorship10km challenge - £20 Reg Fee & min £100 fundraising/sponsorship

Mixed funding

Pay a higher contribution to the cost of your place and fundraise to a more achievable target.

Full challenge 100km - £110 Reg Fee & min £330 fundraising/sponsorship3/4 challenge 75km - £90 Reg Fee &min £270 fundraising/sponsorship1/2 challenge 50km - £75 Reg Fee & min £225 fundraising/sponsorship1/4 challenge 25km - £50 Reg Fee & min £150 fundraising/sponsorship10km challenge - £22.50 Reg Fee & at least £70 fundraising/sponsorship

Please check the Thames Path Ultra Challenge website for the most up-to-date prices and special offer deals.

As part of our team, you’ll receive:

A Terrence Higgins Trust t-shirt to wear with prideExpert fundraising advice and unlimited support from our dedicated teamPre-event training guidance to help you prepare

On the day, you’ll enjoy:

Rest stops with drinks and refreshmentsAll meals and snacks included (depending on your chosen distance)Access to medics, massage services, and pace walkersA finisher’s medal, t-shirt, and a glass of bubbly to celebrate your achievement

Your support and fundraising help fund vital services including our one-of-a-kind sexual health helpline, HIV testing, counselling, and peer support programmes.

We are working to ensure that there will be no new HIV cases in the UK by 2030. Everyone living with HIV will be diagnosed, in treatment and care, free from stigma and able to take advantage of life’s opportunities.

Lace up those walking boots and trek to help us end new cases of HIV in the UK by 2030. To sign up, visit the Thames Path Ultra Challenge site.

Please don’t forget to choose Terrence Higgins Trust as your charity when signing up!

Endurance events for a wide range of fitness & ages – and UK’s #1 series of treks & trial runs. Choose your challenge – do it at your pace, and there’re 18 events in the UK series. Action Challenges support enables you to go further, whilst enjoying the great outdoors & camaraderie. 

There’re marquee rest stops, lots of food & drink, medical & massage teams, with a fully signed route & GPS tracking to guide you. 

A big finish-line celebration awaits with an amazing sense of achievement, and once the aches subside you’ll feel energised, and up for more of life’s real challenges!

See all 2026 Ultra Challenge UK events

Any questions or want to tell us you're signing up to a trek? Contact our Fundraising team.

Have a question about the trek? Checkout the Thames Path Ultra Challenge factsheet.