Tentsmuir Forest 8-hour Challenge

St Andrews, United Kingdom • 18 Oct 2025

The Tentsmuir Forest 8-hour Challenge, organized by NU Limits Running, is an endurance running event held in Tentsmuir Forest, Scotland. Participants aim to complete as many 4.366-mile trail loops as possible within an 8-hour time limit, with each lap featuring 85 feet of ascent. Completing 3 laps equals a half marathon, 6 laps a full marathon, and 7 or more laps an ultra marathon.

The course offers a scenic trail running experience through forest paths. Runners track their progress with a clip card punched at each lap's end. The event fosters a supportive community atmosphere focused on pushing physical and mental limits. Visit the organization's website for the most recent information.

Race information

4 mi
85 m+
4.366 Mile Loop
Visit the organization's website for the most recent information.
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