Bonneville Backyard Ultra
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Bonneville Backyard Ultra - April 25, 2026, Provo, UT
The Bonneville Backyard Ultramarathon is a Backyard Ultra-style race held at Deer Creek Dam Trailhead near Deer Creek Reservoir in Provo, Utah on April 25, 2026. The event follows the original Backyard Ultra format created by Lazarus Lake. The race continues until one runner remains; all other participants who fail to continue are recorded as DNF. Registration closes Mon, Apr 27 @ 11:59 PM MT.
Course, format and rules
Runners must complete one 4.167-mile loop every hour on the hour. The course is an out-and-back along Deer Creek Reservoir, with about 2.08 miles each way. Terrain is described as mostly smooth and very runnable. Organizers mark a corral to track who is continuing each hour. Failure to start a loop on time results in elimination; there are no late starts and no pacers. Audio signals are used each loop: 3 whistles = 3 minutes to go, 2 whistles = 2 minutes to go, 1 whistle = 1 minute to go, and the bell sounds exactly on the hour to begin the next loop. Due to occasional no-shows, a small number of waitlisted runners may be privately invited as standby participants on race day. Visit the organization's website for the most recent information.