The Sweaty Backyard Cox Ultra

JUL

25

2026

The Sweaty Backyard Cox Ultra is a Backyard Ultra in Concord, NC. Runners complete a 4.167-mile loop every hour until only one remains. The race follows the classic last-runner-standing format.

Sat 25 Jul 2026

Concord, North Carolina

Registration Facebook

Loop Backyard Ultra

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Event Format and Rules

The Sweaty Backyard Cox Ultra is a Backyard Ultra event. The competition continues until only one runner remains. The winner is the last person to complete a loop. All other participants receive a DNF result. The race has no set end time.

The course is a loop of exactly 4.167 miles. A new loop starts precisely one hour after the previous one began. To continue, a runner must finish each loop within the one-hour time limit.

Participants must be in the starting corral at the sound of the bell to begin each loop; late starts are not permitted. Runners may not leave the course until a loop is finished, except to use restrooms. No personal aid is allowed during a loop, but common aid stations are provided.