On 26 September 2026, the Chiltern 50 Ultra Challenge turns Henley Showground into a lively basecamp for a day of trail endurance in the Chiltern Hills Area of Outstanding Natural Beauty. From Henley, the 50 km loop follows the Thames to Henley Bridge before heading out onto classic countryside along Shakespeare’s Way, the Icknield Way and the Chiltern Way, with a halfway hub around Lewknor, while shorter 25 km and 10 km loops give a taste of the same scenery. The terrain mixes hard-packed trails, woodland paths, nature reserves and rolling ridgeline sections, building to roughly 920 m of ascent on the full challenge and offering big views across the Chilterns. With full route signage, regular rest stops, hot food, medical and massage support plus on-site camping and a celebratory finish, it’s designed as a fully supported charity-friendly ultra rather than a traditional race—open equally to walkers, joggers and trail runners.
Races
The 10 km Loop on Saturday 26 September 2026 is a shorter circuit from Henley Showground through nearby Chilterns trails, a family-friendly, roughly 10 km route with ~235 m of elevation gain organised by Ultra Challenge / Action Challenge that lets participants enjoy the Henley basecamp atmosphere and scenic hills in a compact format.
Also on 26 September 2026, the 25 km Loop Challenge leaves and returns to Henley Showground, a mid-distance route organised by Ultra Challenge / Action Challenge that samples the same rolling hills, nature reserves and historic trails over roughly 25 km with ~500 m of climb.
On Saturday 26 September 2026, the 50 km main event starts and finishes at Henley Showground, Henley-on-Thames, Oxfordshire, where Ultra Challenge / Action Challenge sends walkers, joggers and runners on a hilly loop with about 920 m of elevation gain along the Thames Path, Shakespeare’s Way, the Icknield Way and the Chiltern Way through classic Chilterns countryside.
Weather based on historical averages.
FAQs
What is the Chiltern 50 Ultra Challenge 10 km?
How long is the Chiltern 50 Ultra Challenge 10 km?
Where does the Chiltern 50 Ultra Challenge 10 km take place?
What is the elevation gain of the Chiltern 50 Ultra Challenge 10 km?
How can I prepare for the Chiltern 50 Ultra Challenge 10 km?
How do I choose the right training plan for the Chiltern 50 Ultra Challenge 10 km?
The 10 km Loop on Saturday 26 September 2026 is a shorter circuit from Henley Showground through nearby Chilterns trails, a family-friendly, roughly 10 km route with ~235 m of elevation gain organised by Ultra Challenge / Action Challenge that lets participants enjoy the Henley basecamp atmosphere and scenic hills in a compact format.
The Chiltern 50 Ultra Challenge 10 km is 10km long.
The Chiltern 50 Ultra Challenge 10 km takes place in Henley-on-Thames, UK.
The Chiltern 50 Ultra Challenge 10 km elevation gain is 235 metres, which Runna classifies as a Hilly 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 Ultra Challenge 10 km?
The 10 km Loop on Saturday 26 September 2026 is a shorter circuit from Henley Showground through nearby Chilterns trails, a family-friendly, roughly 10 km route with ~235 m of elevation gain organised by Ultra Challenge / Action Challenge that lets participants enjoy the Henley basecamp atmosphere and scenic hills in a compact format.
How long is the Chiltern 50 Ultra Challenge 10 km?
The Chiltern 50 Ultra Challenge 10 km is 10km long.
Where does the Chiltern 50 Ultra Challenge 10 km take place?
The Chiltern 50 Ultra Challenge 10 km takes place in Henley-on-Thames, UK.
What is the elevation gain of the Chiltern 50 Ultra Challenge 10 km?
The Chiltern 50 Ultra Challenge 10 km elevation gain is 235 metres, which Runna classifies as a Hilly race.
How can I prepare for the Chiltern 50 Ultra Challenge 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 50 Ultra Challenge 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!
What is the Chiltern 50 Ultra Challenge 25 km?
How long is the Chiltern 50 Ultra Challenge 25 km?
Where does the Chiltern 50 Ultra Challenge 25 km take place?
What is the elevation gain of the Chiltern 50 Ultra Challenge 25 km?
How can I prepare for the Chiltern 50 Ultra Challenge 25 km?
How do I choose the right training plan for the Chiltern 50 Ultra Challenge 25 km?
Also on 26 September 2026, the 25 km Loop Challenge leaves and returns to Henley Showground, a mid-distance route organised by Ultra Challenge / Action Challenge that samples the same rolling hills, nature reserves and historic trails over roughly 25 km with ~500 m of climb.
The Chiltern 50 Ultra Challenge 25 km is 25km long.
The Chiltern 50 Ultra Challenge 25 km takes place in Henley-on-Thames, UK.
The Chiltern 50 Ultra Challenge 25 km elevation gain is 500 metres, which Runna classifies as a Hilly 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 Ultra Challenge 25 km?
Also on 26 September 2026, the 25 km Loop Challenge leaves and returns to Henley Showground, a mid-distance route organised by Ultra Challenge / Action Challenge that samples the same rolling hills, nature reserves and historic trails over roughly 25 km with ~500 m of climb.
How long is the Chiltern 50 Ultra Challenge 25 km?
The Chiltern 50 Ultra Challenge 25 km is 25km long.
Where does the Chiltern 50 Ultra Challenge 25 km take place?
The Chiltern 50 Ultra Challenge 25 km takes place in Henley-on-Thames, UK.
What is the elevation gain of the Chiltern 50 Ultra Challenge 25 km?
The Chiltern 50 Ultra Challenge 25 km elevation gain is 500 metres, which Runna classifies as a Hilly race.
How can I prepare for the Chiltern 50 Ultra Challenge 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 50 Ultra Challenge 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 50 Ultra Challenge 50 km?
How long is the Chiltern 50 Ultra Challenge 50 km?
Where does the Chiltern 50 Ultra Challenge 50 km take place?
What is the elevation gain of the Chiltern 50 Ultra Challenge 50 km?
How can I prepare for the Chiltern 50 Ultra Challenge 50 km?
How do I choose the right training plan for the Chiltern 50 Ultra Challenge 50 km?
On Saturday 26 September 2026, the 50 km main event starts and finishes at Henley Showground, Henley-on-Thames, Oxfordshire, where Ultra Challenge / Action Challenge sends walkers, joggers and runners on a hilly loop with about 920 m of elevation gain along the Thames Path, Shakespeare’s Way, the Icknield Way and the Chiltern Way through classic Chilterns countryside.
The Chiltern 50 Ultra Challenge 50 km is 50km long.
The Chiltern 50 Ultra Challenge 50 km takes place in Henley-on-Thames, UK.
The Chiltern 50 Ultra Challenge 50 km elevation gain is 920 metres, which Runna classifies as a Hilly 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 Ultra Challenge 50 km?
On Saturday 26 September 2026, the 50 km main event starts and finishes at Henley Showground, Henley-on-Thames, Oxfordshire, where Ultra Challenge / Action Challenge sends walkers, joggers and runners on a hilly loop with about 920 m of elevation gain along the Thames Path, Shakespeare’s Way, the Icknield Way and the Chiltern Way through classic Chilterns countryside.
How long is the Chiltern 50 Ultra Challenge 50 km?
The Chiltern 50 Ultra Challenge 50 km is 50km long.
Where does the Chiltern 50 Ultra Challenge 50 km take place?
The Chiltern 50 Ultra Challenge 50 km takes place in Henley-on-Thames, UK.
What is the elevation gain of the Chiltern 50 Ultra Challenge 50 km?
The Chiltern 50 Ultra Challenge 50 km elevation gain is 920 metres, which Runna classifies as a Hilly race.
How can I prepare for the Chiltern 50 Ultra Challenge 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 Ultra Challenge 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!
This event listing is for informational purposes only. Runna is not affiliated with, endorsed by, or sponsored by Chiltern 50 Ultra Challenge 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 website.
