Sisu Backyard Ultra at Lake Rebecca
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Sisu Backyard Ultra at Lake Rebecca
The Sisu Backyard Ultra at Lake Rebecca is an endurance event held in Rockford, MN. The race uses a repeat loop format: runners must complete a 4.167-mile loop every hour, on the hour. Runners who do not complete the loop within the hour or who cannot start the next loop are eliminated; there is no predetermined finish distance.
The course around Lake Rebecca includes mixed surfaces: gravel, asphalt, and trail. A corral area and a shared runner tent sit steps from the starting line to provide a nearby place to rest, change clothes, and organize gear between loops. Food and refreshments are available near the corral. The event offers a sauna and an option for a post-run swim.
The race is livestreamed so supporters can follow hourly starts, runners returning to the finish, and footage from the course. Volunteers and support crews are present throughout the event to assist runners and help operations run smoothly.
Registration information listed for the event shows an entry fee of USD 141.95 and a registration closing date of Sun, Aug 29 at 11:59 PM CT. The listed registration opening date is Sep 19, 2026. Visit the organization's website for the most recent information.
