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Bristol Backyard Ultra

The Bristol Backyard Ultra is not a typical ultramarathon. It is a simple, relentless test of patience, pacing, and mental resolve, set within the historic parkland and woodland trails of Blaise Castle Estate in Bristol — close to the city, yet removed from it entirely. There is no finish line to chase, no target time, and no fixed distance. Just a loop, a bell, and one question asked again every hour: can you go again? The event follows the classic Backyard Ultra (Last One Standing) format. Runners complete a 4.167-mile (6.7 km) trail loop every hour, on the hour. You have 60 minutes to compl…

Past editions