On 1 August 2026, the North Downs 50 Ultra Challenge invites adventurers to tackle a mid-summer trail loop starting and finishing at Loseley Park near Guildford, just outside London. The flagship 50 km circuit showcases some of the best of the Surrey Hills, including stretches of the North Downs Way, chalk ridges, forested tracks and panoramic viewpoints, while 25 km and 10 km options provide shorter but still scenic challenges. Underfoot, the terrain is predominantly trail and bridleway with some farm tracks and short road sections, featuring undulating hills that build to around 830 m of climb for the full loop. Fully supported rest stops, route signage, medical cover and a lively basecamp atmosphere make it accessible to both first-time ultra-challengers and experienced trail runners or hikers looking for a one-day endurance test in a stunning setting.
Races
The Guildford 10K at the North Downs 50 Ultra Challenge is a 10 km loop from Loseley Park on Saturday 1 August 2026, organised by Action Challenge / Ultra Challenge, exploring public footpaths around Littleton and the Loseley Estate to give a shorter, accessible taste of the North Downs trails from the same Guildford basecamp.
Also on Saturday 1 August 2026, the 25 km North Downs Challenge leaves Loseley Park, Guildford for a shorter loop through some of the most picturesque sections of the Surrey Hills and North Downs Way, a mid-distance option organised by Action Challenge with a rest stop halfway and a celebratory lunch back at basecamp.
On Saturday 1 August 2026, the North Downs 50 km Challenge sets off from the Ultra Challenge basecamp at Loseley Park, near Guildford in Surrey, where Action Challenge / Ultra Challenge sends walkers, joggers and runners on a fully supported 50 km loop taking in the North Downs Way, Surrey Hills and Newlands Corner before returning to the same Guildford basecamp finish.
Weather based on historical averages.
FAQs
What is the North Downs Guildford 10 km?
How long is the North Downs Guildford 10 km?
Where does the North Downs Guildford 10 km take place?
What is the elevation gain of the North Downs Guildford 10 km?
How can I prepare for the North Downs Guildford 10 km?
How do I choose the right training plan for the North Downs Guildford 10 km?
The Guildford 10K at the North Downs 50 Ultra Challenge is a 10 km loop from Loseley Park on Saturday 1 August 2026, organised by Action Challenge / Ultra Challenge, exploring public footpaths around Littleton and the Loseley Estate to give a shorter, accessible taste of the North Downs trails from the same Guildford basecamp.
The North Downs Guildford 10 km is 10km long.
The North Downs Guildford 10 km takes place in Guildford, UK.
The North Downs Guildford 10 km elevation gain is 230 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 North Downs Guildford 10 km?
The Guildford 10K at the North Downs 50 Ultra Challenge is a 10 km loop from Loseley Park on Saturday 1 August 2026, organised by Action Challenge / Ultra Challenge, exploring public footpaths around Littleton and the Loseley Estate to give a shorter, accessible taste of the North Downs trails from the same Guildford basecamp.
How long is the North Downs Guildford 10 km?
The North Downs Guildford 10 km is 10km long.
Where does the North Downs Guildford 10 km take place?
The North Downs Guildford 10 km takes place in Guildford, UK.
What is the elevation gain of the North Downs Guildford 10 km?
The North Downs Guildford 10 km elevation gain is 230 metres, which Runna classifies as a Hilly race.
How can I prepare for the North Downs Guildford 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 North Downs Guildford 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 North Downs 25 km?
How long is the North Downs 25 km?
Where does the North Downs 25 km take place?
What is the elevation gain of the North Downs 25 km?
How can I prepare for the North Downs 25 km?
How do I choose the right training plan for the North Downs 25 km?
Also on Saturday 1 August 2026, the 25 km North Downs Challenge leaves Loseley Park, Guildford for a shorter loop through some of the most picturesque sections of the Surrey Hills and North Downs Way, a mid-distance option organised by Action Challenge with a rest stop halfway and a celebratory lunch back at basecamp.
The North Downs 25 km is 25km long.
The North Downs 25 km takes place in Guildford, UK.
The North Downs 25 km elevation gain is 530 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 North Downs 25 km?
Also on Saturday 1 August 2026, the 25 km North Downs Challenge leaves Loseley Park, Guildford for a shorter loop through some of the most picturesque sections of the Surrey Hills and North Downs Way, a mid-distance option organised by Action Challenge with a rest stop halfway and a celebratory lunch back at basecamp.
How long is the North Downs 25 km?
The North Downs 25 km is 25km long.
Where does the North Downs 25 km take place?
The North Downs 25 km takes place in Guildford, UK.
What is the elevation gain of the North Downs 25 km?
The North Downs 25 km elevation gain is 530 metres, which Runna classifies as a Hilly race.
How can I prepare for the North Downs 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 North Downs 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 North Downs 50 km?
How long is the North Downs 50 km?
Where does the North Downs 50 km take place?
What is the elevation gain of the North Downs 50 km?
How can I prepare for the North Downs 50 km?
How do I choose the right training plan for the North Downs 50 km?
On Saturday 1 August 2026, the North Downs 50 km Challenge sets off from the Ultra Challenge basecamp at Loseley Park, near Guildford in Surrey, where Action Challenge / Ultra Challenge sends walkers, joggers and runners on a fully supported 50 km loop taking in the North Downs Way, Surrey Hills and Newlands Corner before returning to the same Guildford basecamp finish.
The North Downs 50 km is 50km long.
The North Downs 50 km takes place in Guildford, UK.
The North Downs 50 km elevation gain is 830 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 North Downs 50 km?
On Saturday 1 August 2026, the North Downs 50 km Challenge sets off from the Ultra Challenge basecamp at Loseley Park, near Guildford in Surrey, where Action Challenge / Ultra Challenge sends walkers, joggers and runners on a fully supported 50 km loop taking in the North Downs Way, Surrey Hills and Newlands Corner before returning to the same Guildford basecamp finish.
How long is the North Downs 50 km?
The North Downs 50 km is 50km long.
Where does the North Downs 50 km take place?
The North Downs 50 km takes place in Guildford, UK.
What is the elevation gain of the North Downs 50 km?
The North Downs 50 km elevation gain is 830 metres, which Runna classifies as a Hilly race.
How can I prepare for the North Downs 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 North Downs 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 North Downs 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 North Downs 50 Ultra Challenge website.
