Tentsmuir Forest 8-hour Challenge
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Event overview
The Tentsmuir Forest 8-hour Challenge takes place on 18 October 2025 at Tentsmuir Forest, Tayport, Fife, United Kingdom. Participants attempt to complete as many 4.366 mile loops as possible within an eight-hour time limit. Runners wear an electronic wristband that records each lap and lap times via the event timing system.
Distances (lap equivalents):
- 3 laps = Half Marathon
- 6 laps = Full Marathon
- 7+ laps = Ultra Marathon
Route and logistics
The course is entirely on trail paths around Tentsmuir Forest and has about 85 ft of ascent per lap. A GPX file for the route and the event basecamp location are available. Basecamp provides two 6 x 3 meter gazebos for kit storage; the organiser does not accept liability for lost items. Spectators are welcome. Parking at Tentsmuir uses a pay barrier system with a day charge of £4.
Mandatory kit requirements include sufficient nutrition and hydration for the event (minimum 500 ml fluid per hour and 60–90 g carbohydrates per hour while running), appropriate clothing for weather, dry clothes for after the event, and a mobile phone. Entry price listed until 15 October 2025 is £41.95; a service fee of 4% (minimum 50p) applies. Total places are 175 and the event status is open. Visit the organization's website for the most recent information.