24hr backyard ultramarathons

24-hour, 12-hour and 100 km racing on Ryavallen’s 400 m track in Borås, with a consistent surface, regular direction changes and round-the-clock support.

Last-person-standing format inspired by the original Backyard Ultra concept, testing endurance through successive timed laps

Alternating dirt and paved 4.167-mile loops with timed laps, creek crossings, fields, cedar groves, rural countryside, and changing fall scenery

4.167-mile loop along the Jordan River trail, repeated hourly for 12 or 24 hours, featuring fall Wasatch Valley scenery and community atmosphere

Backyard ultra at Countryside YMCA in Lebanon, Ohio, with repeated loops, last-runner-standing format, plus 12-hour and 24-hour options.