Scheduled for 27 September 2025, the Chiltern 50 Ultra Challenge invites walkers, joggers, and runners to explore the Chilterns via looped trail courses of 50 km, 25 km, or 10 km, starting and finishing at Henley basecamp. Participants benefit from Ultra Challenge’s signature support—including covered rest stops every ~12.5 km with food, drinks, medical care, and massage, plus GPS-tracked, fully signed routes. The Friday evening before hosts a lively basecamp celebration with BBQ, bar, camping, and camaraderie, followed by a festive post-race finish-line reception with medals, T-shirts, and bubbly. The course traverses an undulating mix of riverside paths, historic trails, nature reserves, and rolling hills accessible from London. The event also includes fundraising options, such as discounted charity places for organizations like Mind, MS Trust, or Teenage Cancer Trust.
Races
50 km
25 km
10 km
Race Date:
27 September, 2025
The 50 km Chiltern Ultra Challenge, hosted by Action Challenge Ltd, takes place on 27 September 2025, looping through the Chilterns—via historic Thames banks, Shakespeare’s Way, Icknield Way, and Chiltern Way—starting and finishing at Henley Showground, with approximately 920 meters of ascent.
Race Date:
27 September, 2025
The 25 km Loop Challenge, also by Action Challenge Ltd, occurs on the same day—27 September 2025, from the Henley Showground basecamp—offering a rewarding mid-distance trail option that climbs around 500 meters through rolling Chiltern countryside.
Race Date:
27 September, 2025
The 10 km Challenge, organized by Action Challenge Ltd, is held on 27 September 2025 at Henley Showground, featuring a compact trail route with 235 meters of climb—ideal for those seeking a briefer yet scenic introduction to the Chilterns.
Weather based on historical averages.
FAQs
What is the Chiltern 50 km?
How long is the Chiltern 50 km?
Where does the Chiltern 50 km take place?
What is the elevation gain of the Chiltern 50 km?
How can I prepare for the Chiltern 50 km?
How do I choose the right training plan for the Chiltern 50 km?
The 50 km Chiltern Ultra Challenge, hosted by Action Challenge Ltd, takes place on 27 September 2025, looping through the Chilterns—via historic Thames banks, Shakespeare’s Way, Icknield Way, and Chiltern Way—starting and finishing at Henley Showground, with approximately 920 meters of ascent.
The Chiltern 50 km is 50km long.
The Chiltern 50 km takes place in Henley-on-Thames, UK.
The Chiltern 50 km elevation gain is 920 metres, which Runna classifies as a Moderate race.
The best way to train for the next race is to use a personalised training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalised training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the Chiltern 50 km?
The 50 km Chiltern Ultra Challenge, hosted by Action Challenge Ltd, takes place on 27 September 2025, looping through the Chilterns—via historic Thames banks, Shakespeare’s Way, Icknield Way, and Chiltern Way—starting and finishing at Henley Showground, with approximately 920 meters of ascent.
How long is the Chiltern 50 km?
The Chiltern 50 km is 50km long.
Where does the Chiltern 50 km take place?
The Chiltern 50 km takes place in Henley-on-Thames, UK.
What is the elevation gain of the Chiltern 50 km?
The Chiltern 50 km elevation gain is 920 metres, which Runna classifies as a Moderate race.
How can I prepare for the Chiltern 50 km?
The best way to train for the next race is to use a personalised training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
How do I choose the right training plan for the Chiltern 50 km?
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalised training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the Chiltern 25 km?
How long is the Chiltern 25 km?
Where does the Chiltern 25 km take place?
What is the elevation gain of the Chiltern 25 km?
How can I prepare for the Chiltern 25 km?
How do I choose the right training plan for the Chiltern 25 km?
The 25 km Loop Challenge, also by Action Challenge Ltd, occurs on the same day—27 September 2025, from the Henley Showground basecamp—offering a rewarding mid-distance trail option that climbs around 500 meters through rolling Chiltern countryside.
The Chiltern 25 km is 25km long.
The Chiltern 25 km takes place in Henley-on-Thames, UK.
The Chiltern 25 km elevation gain is 500 metres, which Runna classifies as a Moderate race.
The best way to train for the next race is to use a personalised training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalised training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the Chiltern 25 km?
The 25 km Loop Challenge, also by Action Challenge Ltd, occurs on the same day—27 September 2025, from the Henley Showground basecamp—offering a rewarding mid-distance trail option that climbs around 500 meters through rolling Chiltern countryside.
How long is the Chiltern 25 km?
The Chiltern 25 km is 25km long.
Where does the Chiltern 25 km take place?
The Chiltern 25 km takes place in Henley-on-Thames, UK.
What is the elevation gain of the Chiltern 25 km?
The Chiltern 25 km elevation gain is 500 metres, which Runna classifies as a Moderate race.
How can I prepare for the Chiltern 25 km?
The best way to train for the next race is to use a personalised training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
How do I choose the right training plan for the Chiltern 25 km?
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalised training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the Chiltern 10 km?
How long is the Chiltern 10 km?
Where does the Chiltern 10 km take place?
What is the elevation gain of the Chiltern 10 km?
How can I prepare for the Chiltern 10 km?
How do I choose the right training plan for the Chiltern 10 km?
The 10 km Challenge, organized by Action Challenge Ltd, is held on 27 September 2025 at Henley Showground, featuring a compact trail route with 235 meters of climb—ideal for those seeking a briefer yet scenic introduction to the Chilterns.
The Chiltern 10 km is 10km long.
The Chiltern 10 km takes place in Henley-on-Thames, UK.
The Chiltern 10 km elevation gain is 235 metres, which Runna classifies as a Moderate race.
The best way to train for the next race is to use a personalised training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalised training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the Chiltern 10 km?
The 10 km Challenge, organized by Action Challenge Ltd, is held on 27 September 2025 at Henley Showground, featuring a compact trail route with 235 meters of climb—ideal for those seeking a briefer yet scenic introduction to the Chilterns.
How long is the Chiltern 10 km?
The Chiltern 10 km is 10km long.
Where does the Chiltern 10 km take place?
The Chiltern 10 km takes place in Henley-on-Thames, UK.
What is the elevation gain of the Chiltern 10 km?
The Chiltern 10 km elevation gain is 235 metres, which Runna classifies as a Moderate race.
How can I prepare for the Chiltern 10 km?
The best way to train for the next race is to use a personalised training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
How do I choose the right training plan for the Chiltern 10 km?
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalised training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
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Sport:
Running
Tags:
Nature
This event listing is for informational purposes only. Runna is not affiliated with, endorsed by, or sponsored by Chiltern 50 Ultra Challenge 2025 or Action Challenge Ltd. All event details are based on publicly available information and are provided solely to help users discover running events. Runna does not use any official logos, images, or proprietary content from this event or its organiser. Any trademarks or names mentioned are used descriptively to identify the event in a factual manner. For the most accurate and up to date information (including to register or purchase an entry to the event), please visit the Chiltern 50 Ultra Challenge 2025 website.
