Bonneville Backyard Ultra

APR

25

2026

Take on the Bonneville Backyard Ultra in Provo and race until only one runner remains as you repeat a 4.167 mile loop each hour along scenic Deer Creek Reservoir. Smooth, runnable terrain rewards steady pacing and determination.

Sat 25 Apr 2026

Charleston, Utah

Registration

4.167-Mile Loop

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Event details

The Bonneville Backyard Ultra is a backyard ultramarathon held in Provo, UT, at the Deer Creek Dam Trailhead. It follows the Backyard Ultra format, a last-person-standing race in which runners repeat a fixed loop each hour. Registration closes Mon, Apr 27 @ 11:59 PM MT.

4.167-mile loop
2.08 miles each way (out-and-back course)

Course and rules

The course runs out-and-back along Deer Creek Reservoir. The terrain is described as mostly smooth and very runnable. Runners must complete one loop every hour on the hour; failing to start a loop on time results in elimination. A corral is used to track who continues each hour. Organizers use signals each loop: 3 whistles = 3 minutes to go, 2 whistles = 2 minutes to go, 1 whistle = 1 minute to go, and the bell signals the hour start. No late starts and no pacers are allowed. The event may invite a small number of waitlisted runners to serve as standby participants on race day. Visit the organization's website for the most recent information.

4 mi

4.167-Mile Loop