The Persistence Backyard Ultra is a renowned endurance event held annually near London, Ontario, Canada. Since its inception in 2022, the race has attracted ultrarunners from across the region and beyond, eager to test their limits in the unique "backyard ultra" format. In this format, participants must complete a 6.7056-kilometer loop every hour, on the hour, until only one runner remains. The event is affiliated with the prestigious Big Dog's Backyard Ultra, the originator of this challenging race style.

The 2026 edition of the Persistence Backyard Ultra is a Silver Ticket event, meaning the winner earns an automatic spot on the Canadian team for the World Team Championship. The race is not only a test of physical and mental endurance but also a community-driven event, with a portion of each registration fee supporting the Children's Health Foundation. The winner receives the coveted "Laz Jacket," named after Lazarus Lake, the creator of the backyard ultra format, adding to the event's prestige and allure.

The course at Eco Park in Arva, just outside London, Ontario, features a 6.7056-kilometer loop composed of crushed stone trail, grass, and a dirt road. Each loop presents an elevation gain of approximately 150 feet, offering a mix of gentle climbs and flat sections. The terrain is designed to be runnable yet challenging, testing both the physical and mental stamina of participants as the hours and loops accumulate.

- Silver Ticket event: Winner qualifies for the World Team Championship
- Affiliated with Big Dog's Backyard Ultra
- Community support: Donations to Children's Health Foundation
- Unique backyard ultra format: 6.7056 km loop every hour
- Coveted "Laz Jacket" awarded to the winner