Logo

Centurion Hundred Hills 50km

Stonor, United Kingdom • 14 Mar 2026

The Centurion Hundred Hills 50km is a scenic trail ultramarathon held in the Chiltern countryside, starting and finishing at the historic 850-year-old Stonor Park near Henley-On-Thames, England. The race features two distinct 25km loops, covering 50 kilometers with approximately 4,000 feet of elevation gain. With a 9-hour cut-off, it suits both first-time ultra runners and those seeking a fast early-season challenge. The course traverses picturesque villages, ancient woodlands, and varied trails, with 80% trail and 20% road terrain. The event offers five well-stocked aid stations, full medical support, and a vibrant atmosphere for runners and spectators, including food and drink vendors at the finish. Visit the organization's website for the most recent information.

United Kingdom South East (England) Stonor

Race information

Website Registration
50 km
1219 m+
Visit the organization's website for the most recent information.
Trail runs nearby

Jennett's Park, Bracknell

Bracknell - 15 mi from Stonor

The Jennett's Park urban orienteering event, hosted by Berkshire Orienteers (BKO) in Bracknell, offers three courses: Long (5.8 km straight line, 8.2 km optimal), Medium (4 km straight line, 5.4 km optimal), and Short (2.4 km straight line, 2.5 km optimal). Suitable for all abilities, the event emph..

Runaway Racing - Chiltern Ridge Half Marathon

Wendover - 14 mi from Stonor

The Chiltern Ridge Half Marathon, organized by Runaway Racing, is a challenging 21.1 km trail race held along The Ridgeway National Trail in Buckinghamshire, between Wendover and Princes Risborough. Starting and finishing in Wendover, the course features an undulating forest loop at Whiteleaf Hill N..

UTMB Index

Race To The Stones

Lewknor - 5 mi from Stonor

Race to the Stones is the UK's largest ultramarathon, held along the ancient Ridgeway trail from Lewknor to the 5,000-year-old Avebury Standing Stones, a UNESCO World Heritage site. Covering 100 kilometers with 1,340 meters of elevation, the event offers a non-stop challenge or a two-day option with..

UTMB Index

North Downs 50 Ultra Challenge

Guildford - 29 mi from Stonor

The North Downs 50 Ultra Challenge is a premier endurance event held in the Surrey Hills, starting and finishing at the Guildford basecamp. Participants can walk, jog, or run on looped routes of 50km, 25km, or 10km, featuring scenic trails along the North Downs Way with stunning southern views. The..

UTMB Index

Surrey Hills 10km

Guildford - 29 mi from Stonor

The Surrey Hills 10km is a guided trail run set in the picturesque Surrey Hills Area of Natural Beauty near Guildford, UK. The 10km route starts with a climb up St Martha's Hill, offering panoramic views from the hilltop church, then continues to Newlands Corner with stunning vistas over Surrey’s ro..

Hughenden Valley 10k

Hughenden Valley - 9 mi from Stonor

The Hughenden Valley 10K is a popular trail running event held around the National Trust's Hughenden Manor estate near High Wycombe. The 10-kilometer course features a hilly terrain with over 195 meters of elevation gain, winding through beautiful woodland and rural trails in Hughenden Valley. The r..