Centurion Hundred Hills 50km

Event overview

The Hundred Hills 50km is a 50 km trail ultramarathon held on 14 March 2026 at Stonor Park, Stonor, Henley-On-Thames (RG9 6HF) in the Chilterns. The course comprises two different 25 km loops and includes approximately 4000 ft (1200 m) of climb. The route is marked for the full duration and the event is run under a UK Athletics permit (permit number pending). The stated terrain split is 80% trail and 20% road. The overall cut-off time for the course is nine hours.

Logistics and race rules

Entries are open; the published entry fee is £78 (£80 for unaffiliated runners). Minimum age is 20 on the event date. There are five staffed aid stations on course; finish-line hot food and drink are included in the entry fee. Medical support is provided with a static finish-line team and at least one roving team on course. Pacers and crew are not permitted. Mandatory kit includes a fully charged mobile phone with race medic and director numbers, a minimum 1 litre water capacity, a survival blanket (minimum 1.4m x 2m), a waterproof jacket with sealed seams and minimum 10000 mm rating, a whistle, and a long-sleeved base layer or fleece kept dry for emergencies. A one-hour time penalty applies for any missing mandatory item found during kit checks. Visit the organization's website for the most recent information.