Bonneville Backyard Ultra
Charleston, United States • 24 Apr 2027
Bonneville Backyard Ultra - Provo, UT
The Bonneville Backyard Ultramarathon is a last person standing race held near Deer Creek Reservoir in Provo, UT, with the Deer Creek Dam Trailhead listed as the venue. The format requires each runner to complete one 4.167 mile loop every hour on the hour; runners who finish a loop early may rest but must return to the corral before the next bell.
The course is an out and back along the reservoir, roughly 2.08 miles each way. The terrain is described as mostly smooth and very runnable. The event emphasizes repetition and the mental aspects of endurance; the hourly restart, sleep disruption, and repeated effort are noted as factors that affect performance.
Race procedures include a painted corral used to track who is continuing each hour and a sequence of signals before each start: three whistles for three minutes to go, two whistles for two minutes to go, one whistle for one minute to go, and the bell to start the loop exactly on the hour. A runner who is not inside the corral when the bell rings is removed from the event; late starts, pacers, and exceptions are not permitted. Only one runner will be declared the final finisher.
Registration is scheduled to open July 1, 2026. Organizers reserve the right to invite a small number of waitlisted runners as standby participants due to occasional last-minute no-shows. Visit the organization's website for the most recent information.