Saturday 18 April 2026
Windsor Racecourse
Choose from 10k, 25k or 50k!
Choose your distance and pace, and join Team Cancer Research UK in the Windsor 50 Ultra Challenge (previously the Easter 50 Ultra Challenge), and play your part in supporting vital cancer research.
If you've secured your own place in the Windsor 50 Ultra Challenge, use it to join Team Cancer Research UK and fundraise for vital cancer research. No extra entry fee, you'll have already paid the event organiser. Set your own fundraising target.
Step: 1
Decide whether you'll enter with your own place or get a charity place
Step: 2
Sign up to get Team Cancer Research UK perks
Step: 3
Get fundraising for life-saving research
Step: 4
Get over that finish line and smash your fundraising target
The 2nd Ultra Challenge of the season – and a good one to take on after the Easter break! From the Windsor Racecourse basecamp, you can Walk, Jog or Run a looped route 50 km, 25 km, or 10 km through historic Windsor, along the Thames Path, and enjoy some wonderful surrounding countryside.
Take a look at the event Factsheet(PDF, 4.35 MB)
40 CRUK runners taking on the Windsor 50 Ultra Challenge
Hitting their fundraising targets to raise a total of around £15,000
Could fund the CanRisk project, which is developing a way to accurately predit people's risk of developing cancer, for one week
We've teamed up with experts to give you the best training support and advice for your event. Whether it's your first time training or you're looking to smash a PB, we've got a training plan for you.
We're with you every step of your fundraising journey so you can smash your target. Once you've signed up, we'll send you everything you need to get going such as fundraising ideas, top tips, planners and posters.
We worked with Scimitar to create Cancer Research UK sportswear that’s comfortable, looks great and supports our vital work. 20% of the price of these products will be paid to Cancer Research UK.
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