Butterfield Backyard Ultra

Butterfield Backyard Ultra, hosted by Happy Trails Racing, takes place at Butterfield Trailhead Regional Park in Herriman, Utah. The event features two Backyard Ultra formats on a 4.167-mile trail loop with about 512 feet of elevation gain per lap, run once per hour for either 6 or 12 hours. The mostly trail course is marked with pink flags, offering Wasatch-front scenery.

Runners must finish each loop within the hour or withdraw; the finish line becomes a festive home base with snacks and support. The Legacy loop at the end times the winners. All finishers receive a medal; 12-hour finishers earn a leather patch beanie.

Capacity: 120 (12-hour) and 60 (6-hour). Visit the organization's website for the most recent information.