A backyard ultra is a type of ultramarathon where runners must complete a 4.167-mile (6.7 km) loop every hour, on the hour, until only one runner remains.
This seemingly arbitrary distance is derived from the need to complete 100 miles in 24 hours. The race continues until only one runner is left who can complete a loop within the allotted time. This format, popularized by Lazarus Lake (also known as Gary Cantrell) of the Barkley Marathons fame, has a deceptively simple structure but requires immense physical and mental resilience.
The details of the race:
- Hourly Start: Every hour, runners start a new loop. If a runner fails to complete the loop within the hour, they are out of the race.
- Rest Periods: Any time remaining after a runner finishes a loop is their rest period. For example, if a runner completes a loop in 50 minutes, they have 10 minutes to rest, eat, or tend to any needs before starting again.
- No End in Sight: The race continues indefinitely until only one runner completes a loop within the hour. The last runner standing must complete one more loop than the second-to-last runner to be declared the winner.
The Appeal: Backyard ultras attract a wide range of participants, from seasoned ultramarathoners to those looking for a new kind of challenge. The format levels the playing field, as it’s not necessarily about who can run the fastest, but who can manage their time, energy, and strategy the best.