Bonneville Backyard Ultra

The Bonneville Backyard Ultra, held near Provo, Utah at the Deer Creek Dam Trailhead, is a challenging last-person-standing ultramarathon. Runners complete a 4.167-mile out-and-back loop along the scenic Deer Creek Reservoir every hour on the hour. The course is mostly smooth and runnable, but the repetitive hourly starts, mental strain, and sleep deprivation make it tough.

Participants must start each loop exactly on time or face elimination, with no pacers allowed. The event emphasizes endurance and mental toughness over a fixed distance or time, continuing until only one runner remains. It offers a unique, intense atmosphere for ultrarunners seeking to push their limits. Visit the organization's website for the most recent information.