Chiltern 50
Ultra Challenge®
Sat 27 Sept 2025
- Walk, Jog, or Run
- Henley Basecamp
- 50 km & 25 km Loops & 10K
- ULTRA MARCH Option
- Camping Packages
- Transfers
End of season 50 km looped challenge in some of the Chilterns finest countryside, with historic trails, rolling hills, nature reserves, and fantastic views. At our basecamp in Henley, there’s a Saturday night celebration BBQ, bar & entertainment, with extensive on-site camping & parking options. A route with real variety and some wonderful scenery – and easily accessible from London. You’ll get full support & hospitality, and with 25 km loop option and a 10K loop also available, there’s a Chiltern Ultra Challenge® for everyone!
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 16 events in the Series. Our 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 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 to successfully completing an Ultra Challenge. From the moment you sign up you’ll have access to our Challenge App, with training guides, optional training walks & runs, maps, on the day info, and online forums. We will also keep you updated with any news & challenge updates via notifications through the app and emails.
Keeping you well fed & hydrated is key to getting you across that finish line successfully & safely. Whichever distance you are signed up every meal and snack stop is included in your entry so you can expect:
- Regular snack stops every 12.5 km
- Main meal/every 25 km
- Hot drinks, water & energy drinks at all stops
- We cater for every dietary requirement
- Lighter options for ‘runners’
- Finishers meal
We have Rest Stops every 12.5 km or so with ‘major’ ones at ~25/50/75/100 km. Our Rest Stops are like no others – along side a large medical area and catering services they are all covered infrastructure (to keep you out of the sun or rain!) – here there will be a place to sit down and put your feet up, use any of the facilities (toilets, medics, changing rooms, rest areas, baggage pick up). Manned by our team to help with any query or questions you have!
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. There’s also the option to hire a ‘GEO TRACKER’ – so they can follow you in real time every step of the way – day & night!
For those taking on the Full Challenge (~100 km) across 2 days we have on every event a ‘Base Camp’ set up where you can either book one of our all inclusive camping packages or ‘pitch your own’. Our camp sites have hot showers, drinks stations, chill out areas and are a great way to get some shut eye over the Saturday night, before taking on the 2nd day of your challenge!
Keeping you safe and healthy is our upmost priority – we have a vast experienced team of Doctors, Paramedics, First Aiders, Podiatrists and Masseuses available and on hand at every Rest Stop (as well as roaming the route). You will also have access to a ‘self help’ area at every stop with blister plasters, talcum powder & more should you just need tape yourself up!
We don’t ever want you to forget that moment you reached your goal and crossed over the finish line – our Cheer Squad will ensure that you don’t! You will be given a medal, finisher’s t-shirt, glass of fizz and a photo finish! Before being guided to a hot meal drinks & a well earned sit down and rest.
We operate shuttles to and from the nearest train station for anyone needing onward travel after their challenge, the majority of our finish lines also have ample parking so your supporters can meet you and pick you up, as well as we will have specific ‘transfers’ back to other locations – check the individual event pages for full details of the services we will be laying on.
Looking for a great event for your team without all the hassle, risk, or costs of organising it? These events are the PERFECT solution – and we had over 400 company teams joining us in 2024.
Your Team will be energised, exercised, bonding & motivated on a fun, accessible, safe, high quality outdoors event. With optional hospitality packages available – make an Ultra Challenge® your company’s special event – maybe supporting your ‘charity of the year’.
FIND OUT MORE >>
Get in Touch:
corporate@actionchallenge.com
Date: Sat 27 Sept 2025
Start & Finish: Henley Showground
Distance & Elevation: 50 km & 920 m elevation
Date: Sat 27 Sept 2025
Start & Finish: Henley Showground
Distance & Elevation: 25 km & 500 m elevation
10 km Chiltern loop
Henley (basecamp) > Henley (basecamp)
- Saturday 27 September 2025
- Startline – Henley (basecamp)
- 10km & ~ 235 m elevation
- Finish line – Henley (basecamp)
Your Challenge,
Your Way!
WINTER Deal
FREE Tech T Shirt worth £20
+ SAVE ££’s OFF Reg Fee!
Excludes: Winter & Halloween Walks, & 10K/mile events
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® ‘Pace Chart in the App sets a minimum 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
Do it for yourself/ Self Fund
Pay for your event place in full, with no fundraising required. Sign up & pay online today!
Do it and support a charity/ Fundraise
Pay a registration fee & commit to fundraise for a charity of your choice.
Best Value 'MULTI DEALS' for 3 events or more. Save up to 25%!
2025
FACTSHEET
All you need to know about the Challenge & how you can take it on. Print it off - or send it to your friends!
Check out
the routes & maps
Corporate Team Packages
Looking for an event to get your team energised - download our information sheet for details.
Choose your charity
We’re proud to work with a wide range of UK charities, which benefit from the Ultra Challenge fundraising – and which exceeded £10 MILLION in 2024. Our main ‘Series Partners’ are some of the UK’s major national charities – all of which will fully support your fundraising endeavours. For our WINTER DEAL – with the ‘Full Sponsorship for Charity‘ option – you can sign-up for ANY of the 600+ Charities involved – and get an additional 25% OFF Reg Fees. Choose a Charity, sign-up, and set up your JustGiving fundraising page NOW.
OFFICIAL PARTNERS
50% OFF FULL SPONSORSHIP FOR CHARITY REG FEE
2025 ASSOCIATE PARTNERS
25% Off Standard Reg Fee
OR CHOOSE FROM over 600 LISTED CHARITIES
OUR OFFICIAL FUNDRAISING PARTNER
18 Amazing Challenges
Over 200,000 adventurers have taken on an Ultra Challenge® so far and the 18 unique events make up the UK’s biggest & best series of treks & trail runs – which now also raises £10+ million a year 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 at your pace! Whoever you are – If you’re up for a challenge, it has to be an Ultra Challenge®
2 NEW EVENTS FOR 2025
Lake District Ultra Challenge
7-8 June 2025
100 km loop + Half + Marathon + Quarter Challenge options & Ambleside 10K
1 of 17Isle 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 17London 2 Brighton Ultra Challenge
24-25 May 2025
100 km + Half, Marathon & Quarter Challenge distance options
3 of 17South Coast Ultra Challenge
6-7 Sept 2025
100 km + Half & Quarter Challenge options
4 of 17Jurassic Coast Ultra Challenge
17-18 May 2025
100 km + Half & Quarter Challenge options AND Marathon + Double Marathon & Bridport 10K
5 of 17Thames Path Ultra Challenge
13-14 Sept 2025
100 km + 3/4 + Half & Quarter Challenge options
+ Thames Bridges 25km Trek (Sat – Central London)
+ Friday Moonlight 10K Walk (Central London)
+ The Henley 10K (Sunday)
6 of 17South West Coast 50 Ultra Challenge
2 August 2025
50 km Loop + 25 km & 10 km Challenge options
7 of 17The Bath 50 Ultra Challenge
29 March 2025
50 km Loop + 25 km & 10 km Challenge options
8 of 17Gower Peninsula Ultra Challenge
NEW FOR 2025
19-20 July 2025
100 km (fig. of 8) 50 km Loops (West & East) + Marathon + 25 km & 10 km Challenge options
9 of 17Peak District Ultra Challenge
28-29 June 2025
100 km Loop + ~50 km Half & 25km Quarter Challenge options & The Bakewell 10 Mile.
10 of 17Cotswold Way Ultra Challenge
21 – 22 June 2025
100 km + 3/4 + Half & Quarter Challenge options. + Cirencester 10K
11 of 17Chiltern 50 Ultra Challenge
27 Sept 2025
50 km Loop + 25 km & 10K Challenge options
12 of 17North Downs 50 Ultra Challenge
12 July 2025
50 km Loop + 25 km & 10km Challenge options.
13 of 17Easter 50 Ultra Challenge
Sat 12 April 2025
Windsor
50 km, 25 km, 0r 10 km Loops from racecourse basecamp.
14 of 17London Winter Walk
25 & 26 January 2025
Marathon, Half Marathon, 10 KM, or 5 KM looped routes – The Oval Start / Finish
15 of 17London Halloween Walk
Sat 26 October 2024
25 KM or 10 KM spooky looped route options. Start / finish – The Oval Cricket Ground ‘dungeon’,
16 of 17Kent 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.
17 of 17