Easter 50
Ultra Challenge®
Sat 12 April 2025
- Windsor & Thames Path
- 50 km or 25 km or 10 km Loop
- Walk, Jog, or Run
- Windsor Racecourse Basecamp
- Transfers
- Parking
- Solo Challenger Start Option
- Ultra March Option
Take on a 50 km Ultra, a historic 25 km, or a sharp 10 km challenge – and make it an active Easter! From our Windsor Racecourse basecamp 2000 adventurers will head out on looped routes through the Great Park with fantastic views of the Castle, on to Runnymede, along the Thames Path, and takes in some wonderful surrounding countryside. You’ll get full support all the way, and a celebration finish back at basecamp. It’s a great way to kick off the Ultra Challenge® season, and start to get in shape for summer.
REGISTRATION NOW OPEN!
The Ultra Challenge Experience
Endurance events for a wide range of fitness & ages – and the UK’s #1 series of treks & trail runs. Choose your Challenge – do it at your pace, and there’re 17 events in the Series. Our support enables you to go further, whilst enjoying the great outdoors & camaraderie. There are marquee rest stops, lots of food & drink, medical & massage teams, with a fully signed route 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!
Good preparation & smart planning are key, and from the moment you sign up you’ll have access to our Challenge App – with training guides, optional training walks, maps, online forums, and the latest news & updates.
Rest Stops every ~12.5 km with ‘major’ ones every ~25 km, and are much more than the shaky gazebo with water that you see on some events. We’ve marquee cover, large medical & welfare tents, catering services, seating areas for recovery, changing rooms, and a friendly welcome!
There’re pink arrows to guide you, distance markers, glow-sticks at night, hazard signs, and a route map in the App. Our ‘Trek Masters’ organise group departures at night so nobody has to walk solo. Our chip timing system enables our Control Room, and your friends / family, to track your progress through the Rest Stops.
Keeping you well fed & hydrated is key. We pride ourselves on the quantity & quality of our catering, and meals, snacks & drinks are included!
- Snacks & drink stops every 12.5 km
- Snacks – from the healthy to treats
- Picnic at 25 km (for 50km participants)
- Energy drinks
- All dietary requirements catered for
- Lighter options for ‘runners’
- Finishers hot meal 50 km (picnic for 25km & 10km)
We’ve experienced Doctors, Paramedics, First Aiders, Podiatrists, and Massage Teams at Rest Stops. There’re ‘Self Help’ areas with blister plasters, talc, Vaseline, and tape if you want to patch your own feet. Our mobile Emergency Medical Teams are only a phone call away, via our 24 hour Control Room
We don’t want you to forget that finish-line moment – our Cheer Squad will ensure you won’t! You’ll get a medal, finisher’s T-shirt, and a glass of fizz, before heading to a BBQ and a well earned rest. Download your official Challenge certificate when you’re ready.
There’re shuttles to local train stations for onward travel, and most finish lines have parking so supporters can meet you. We’ve bus ‘transfers’ to / back to key venues (eg the start) – and check out the ‘Bookable Extras’ for details of all transport options.
Two very different 25 km loops – making a figure of 8 route from our basecamp
Date: Sat 12 April’ 25
Start & Finish: Windsor Racecourse
Distance & Elevation: 50 km & 320 m elevation
Rest Stops:
- ~12.5km, snacks & drinks
- 25km, picnic lunch
- ~37.5km, snacks & drinks
- 50km, hot food
ULTRA MARCH® option also available for ‘walkers’ aiming for a sub-12 hours 50 km.
Looped route that includes the Great Park.
Date: Sat 12 April’ 25
Start & Finish: Windsor Racecourse
Distance & Elevation: 25 km & 175 m elevatio
Rest Stops:
- ~12.5km, snacks & drinks
- 25km, picnic lunch
Looped route around Eton, Windsor & Castle
Date: Sat 12 April’ 25
Start & Finish: Windsor Racecourse
Distance & Elevation: 10 km & ~25m of elevation
Rest Stops:
- snacks & drinks at start
- 10km picnic lunch
Your Challenge
Your Way!
Whether you’re a walker and new to challenge events, an experienced trekker, a marathon enthusiast upping the distance, or a seasoned ultra runner after UTMB points – there’s an Ultra Challenge® for you! Walk, Jog, or Run at your pace, as an Individual or a Team, for a charity of your choice or just for you. There’s an Ultra March® option for ‘fast walkers’ – and a new ‘Solo Challenger’ start time to join up with others. Easter 50 Ultra Challenge is fun, safe, & rewarding – with full support all the way, enabling you to push yourself further in wonderful historic scenery – and enjoy a great day out!
Walk, Hike, or Trek
100km < 24 hours
  50 km < 12 hours
Up for a NEW Style of Ultra Challenge?
An ‘Ultra March®’ is about WALKING at a brisk & consistent pace with like minded challengers to achieve it – a bit like a march! – but taking in the great rest stops & services of an Ultra Challenge!
- Participants opt in to the Ultra March® category
- Up to 300 will set off together as a big Ultra March® group.
- Single Start Time – 8.30am Saturday
- Ultra March® ‘Pacers’ set min. pace.
- Special Finishers Medal & Certificate .
THE RULES:
Over & above the general Ultra Challenge Rules – with an Ultra March® it’s:
- STRICTLY WALKING ONLY (no jogging / running)
- Stage times will be ‘checked’.
- You must complete 100km in sub 24 hours – or 50km is sub 12 hours to qualify for special medal & certificate.
- If you are ‘outside’ of the time target – you still celebrate with a conventional ‘Ultra Challenge medal / certificate.
You will be able to ‘opt’ into the Ultra March Category Start Time on the Registration / Sign Up Form. So follow the normal ‘Sign Up’ links.
How to Join
For yourself - or support a charity
2025 Registration Opens Mid Year
Do it for yourself & JUST Self Fund
Pay for your event place in full, with no charity involvement. Prices vary by distance – sign up & pay online today!
Do it & support a charity of your choice
Pay a Reg Fee and then commit to fundraise / get sponsorship for your Charity. 3 Options are available.
'MULTI DEALS' for 3 events or more. SAVE up to 25%!
Choose your charity
We’re proud to work with a wide range of fantastic charities, which benefit from the Ultra Challenge £9+ million fundraising each year. Our main ‘Series Partners’ are some of the UK’s major national charities – all of which will fully support your fundraising endeavours. For our EARLY BIRD DEAL – with the ‘Full Sponsorship for Charity‘ option – you can sign-up for ANY of the 600+ Charities involved – ANY distance – for only £10 – saving up to £40 OFF! Choose a Charity, sign-up, and set up your JustGiving fundraising page NOW.
2025 SERIES PARTNERS
CHOOSE FROM over 600 CHARITIES
OUR OFFICIAL FUNDRAISING PARTNER
2024
FACTSHEET
All you need to know about the Challenge & how you can take it on. Print it off - or send to friends!
Check out
the routes & maps
Corporate Team Packages
Looking for an event to get your team energised - download our information sheet for details.
17 Amazing Challenges
Over 200,000 adventurers have taken on an Ultra Challenge® so far, and the 17 unique events make up the UK’s biggest & best series of treks & trail runs – which have also raised £55+ million for charities. Whichever challenge you choose, you’ll get full support all the way so you can set a new goal, enjoy the British countryside, and Push Yourself Further! Whoever you are – If you’re up for a challenge, it has to be an Ultra Challenge in 2025.
Lake District Ultra Challenge
7-8 June 2025
100 km loop + Half + Marathon + Quarter Challenge options & Ambleside 10K
1 of 16Isle of Wight Ultra Challenge
3-4 May 2025
106 km ‘Full Island’ Loop + Half & Quarter Island options AND ‘Cross Island’ & Medina 10 Mile challenges.
2 of 16London 2 Brighton Ultra Challenge
24-25 May 2025
100 km + Half, Marathon & Quarter Challenge distance options + Brighton 25 km Loop!
3 of 16South Coast Ultra Challenge
6-7 Sept 2025
100 km + Half & Quarter Challenge options
4 of 16Jurassic Coast Ultra Challenge
17-18 May 2025
100 km + Half & Quarter Challenge options AND Marathon & Bridport 10K
5 of 16Thames Path Ultra Challenge
13 – 14 Sept 2025
100 km + 3/4 + Half & Quarter Challenge options & Henley 10K
+ Thames Bridges 25km Trek (Sat – Central London)
+ Friday Moonlight 10K Walk (Central London)
+ The Henley 10K (Sunday)
6 of 16South West Coast 50 Ultra Challenge
2 August 2025
50 km Loop + 25 km & 10 km Challenge options
7 of 16Gower Peninsula Ultra Challenge
19-20 July 2025
100 km (fig. of 8) 50 km Loops (West & East) + Marathon + 25 km & 10 km Challenge options
8 of 16Peak District Ultra Challenge
28-29 June 2025
100 km (Fig. of 8) + Half (loop) & Quarter Challenge options & The Bakewell 10 Mile.
9 of 16Cotswold Way Ultra Challenge
21 – 22 June 2025
100 km + 3/4 + Half & Quarter Challenge options. + Cirencester 10K
10 of 16Chiltern 50 Ultra Challenge
27 Sept 2025
50 km Loop + 25 km & 10K Challenge options
11 of 16North Downs 50 Ultra Challenge
26 July 2025
50 km Loop + 25 km & 10km Challenge options.
12 of 16Easter 50 Ultra Challenge
Sat 12 April 2025
Windsor
50 km, 25 km, 0r 10 km Loops from racecourse basecamp.
13 of 16London Summer Walk
Sat 23 August 2025
50 km or 25 km or 10 km looped route – Woolwich Start / Finish
14 of 16London Halloween Walk
Sat 25 October 2025
25 KM or 10 KM spooky looped route options. Start / finish – The Oval Cricket Ground ‘dungeon’,
15 of 16NEW – Kent Downs 50 Ultra Challenge
Sat 11 October 2025
50 KM, 25 KM or 10 KM looped routes options. Start / finish – The Kent Showground nr. Maidstone.
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