Logo

North Downs 50 Ultra Challenge

Guildford, United Kingdom • 1 Aug 2026

The North Downs 50 Ultra Challenge is a premier endurance event held in the Surrey Hills, starting and finishing at Loseley Park, Guildford. Participants can choose from 50km, 25km, or 10km looped routes that showcase the scenic North Downs Way and surrounding countryside, offering varied terrain and stunning southern views. The event welcomes walkers, joggers, and runners of all experience levels, with full support including covered rest stops every 12.5 km, food and drink catering to all dietary needs, medical and massage teams, and GPS-tracked, well-signed routes. Optional camping and university-style accommodation are available. Finishers receive a medal, t-shirt, and celebratory meal, making it a rewarding challenge accessible from London. Visit the organization's website for the most recent information.

United Kingdom South East (England) Guildford

Race information

Website
50 km
830 m+
50 Km Loop
25 km
530 m+
25 Km Loop
24 km
600 m+
24 Km Half Route to Dorking
10 km
230 m+
10 Km Loop
Visit the organization's website for the most recent information.
Trail runs nearby

Windsor & Eton 10km

Windsor - 16 mi from Guildford

The Windsor & Eton 10km is a scenic multi-terrain trail run held in the historic Royal town of Windsor, starting and finishing near the Windsor & Eton Brewery by the River Thames. The pancake-flat course covers 10 kilometers, featuring towpaths, footpaths, and short road sections through areas inclu..

SEOUL Urban Epsom

Epsom - 15 mi from Guildford

...

The SEOUL Urban Epsom is a Level B urban orienteering event held in the historic spa town of Epsom, known for its racecourse and scenic North Downs views over Central London. The event features multiple courses ranging from 2.0 km for young juniors to 11.4 km for men's open, with varied climbs and t..

Woldingham Marathon

Woldingham - 23 mi from Guildford

The Woldingham Full and Half Marathon, staged by 1 Mile Events, takes place at Woldingham School in Caterham, Surrey. It offers a Half Marathon (13.1 miles) and Full Marathon (26.2 miles). Both routes are out-and-back: the half runs one loop, the full two loops. Starting from the school, runners tra..

Henley River Half Marathon

Henley-on-Thames - 25 mi from Guildford

Henley River Half Marathon, 10k & Juniors August 2025 is a RunThrough UK event held in Henley-on-Thames, UK. The course offers a fast scenic trail around Henley-on-Thames, starting and finishing by Temple Island Meadows, the official start line for the Royal Henley Rowing Regatta. Distances availabl..

London Backyard Ultra

Croydon - 23 mi from Guildford

The London Backyard Ultra is a unique endurance running event held at Frylands Wood Scout Outdoor Centre in Croydon, London. Participants run a four-mile loop every hour on the hour, continuing until only one runner remains, testing their true limits. The event offers a challenging yet supportive at..

The Shere 42k Multi Terrain Event

Shere - 5 mi from Guildford

The Shere 42k, 21k & 10k Multi Terrain Event is a trail running series held in the scenic Surrey Hills, an Area of Outstanding Natural Beauty. The event offers three distances: a 10k route with 123m ascent through woodlands, a new 21k half marathon featuring parts of the North Downs and Ranmore with..