Centennial100 Ultra

The Centennial100 Relay and Ultra is a 100-kilometer (62 miles) running event held along the Centennial Trail, starting at Space 802 in Snohomish, Washington. Scheduled for August 16, 2025, it welcomes solo runners or teams of 2, 3, or 6 participants. The course features themed exchange points, each offering a mini running party atmosphere.

The event concludes with an after-party at the start location, including live music, a beer garden, and BBQ. All finishers receive medals and stickers. The race promotes a festive, community-driven environment suitable for all levels of runners. Visit the organization's website for the most recent information.