Bonneville Backyard Ultra

The Bonneville Backyard Ultra is a unique endurance event based on the last person standing format, scheduled to begin on Saturday, April 25, 2026, at the Deer Creek Dam Trailhead near Provo, Utah. Following the traditional Backyard Ultra rules, participants must complete a 4.167-mile loop every hour on the hour. The race has no fixed finish line or duration; it continues until only one runner remains who can complete a loop within the time limit. All other participants receive a Did Not Finish (DNF) status. The course is an out-and-back route totaling 4.167 miles along the Deer Creek Reservoir, featuring mostly smooth and runnable terrain that emphasizes mental discipline and pacing.

Provo is located between the Wasatch Front and Utah Lake. Geographically, the Deer Creek Dam area sits at an elevation of approximately 5,400 feet, which can impact the oxygen intake and recovery of participants over multiple days. In late April, the local climate typically sees average daytime highs of 18°C (64°F) and nighttime lows around 3°C (37°F). Runners staying in the race through the night must prepare for significant temperature drops and the potential for mountain winds coming off the reservoir.

The race operates with a strict signal system: whistles at three, two, and one minute before the hour, followed by a bell to signify the start of the next loop. Any runner not inside the starting corral when the bell rings is disqualified. There are no pacers allowed, and the physical aid is primarily located at the start/finish area where runners can utilize the time remaining in their hour to rest or refuel. Due to the high demand for Utah's original Backyard event, registration typically closes a few days before the start, though a waitlist system is used to fill last-minute vacancies. This format is designed to test the absolute limit of a runner's willpower, as the competition only ends when the assist runner drops out, leaving the winner to complete one final solo loop.