Thetford Back Yard Ultra

About Thetford Back Yard Ultra

Thetford Back Yard Ultra The Thetford Back Yard Ultra (TBYU) endurance race starts on 13 September 2025 at High Lodge in Thetford Forest, Brandon. A Backyard Ultra is a form of ultramarathon race where competitors must consecutively run a 6.71km / 4.17 mile course in less than one hour, every hour. When each lap is completed, the remaining time within the hour is used to recover and replenish for the next hour's race. The race finishes when one person completes one more lap than anyone else. The route terrain is rolling forest and heathland trail, it will be signed with arrows and barrier tape. This is the late summer version of the 4.167 mile lap per hour - Last one standing format

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