Centurion Hundred Hills 50km
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Hundred Hills 50km : event overview
The Hundred Hills 50km takes place on 14 March 2026 and starts and finishes at 850-year-old Stonor Park, Henley-on-Thames (RG9 6HF). The event is a 50 km trail ultra run made up of two different 25 km loops. The published entry fee is £78 (£80 for unaffiliated runners). Minimum age for entry is 20. The field is listed as 450 starters and the entries so far are shown as 226 participants. Registration and race headquarters are at Stonor Park. The race is held under a UK Athletics permit through the TRA.
Course, support and rules
The route covers about 50 km with approximately 4000 ft (1200 m) of climb and is roughly 80% trail and 20% road. The course is fully marked and there are five aid stations with hot food at the finish included in the entry. Medical support is provided with a static first aid team at the finish and roving medics on course. Runners must finish within a 9 hour cut-off and there are additional intermediate cut-offs. Pacers and crews are not permitted. Mandatory kit is required and subject to checks; missing an item may incur a one-hour time penalty. Medals are awarded to finishers; alternatives and age-category prizes are also listed. Visit the organization's website for the most recent information.