Centennial100 Ultra

JUN

13

2026

The Centennial100 offers a 100 km journey along the Centennial Trail. Runners can participate solo or in teams of 2, 3, or 6. The event features themed exchanges, a festive after party, and unique cowbell awards for all finishers.

Sat 13 Jun 2026

Snohomish, Washington

Website Registration

100 kilometers

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Event Information

The Centennial100 is a relay and ultra run covering a distance of 100 km (62 miles). The route spans the Centennial Trail. Participants can take part in several formats:

Teams of 6 runners
Teams of 3 runners
Teams of 2 runners
Solo 100 km ultra run

The start location is Space 802 at 802 1st Street in Snohomish, Washington. The event date is June 13, 2026.

Event Details

The course uses a set of exchanges along the out-and-back route. Each exchange point has its own theme. An after-party with music, a beer garden, and food begins at 3 PM and continues until the last finisher arrives.

Participants receive race swag in the form of a mesh football jersey. Finishers also collect cowbells, with the number varying based on team size: two per finisher for teams of 6, three for teams of 3, four for teams of 2, and seven for solo ultra runners.

Registration fees vary by category and increase after September 28, 2025. Relay captains pay a team fee, while team members join their relay teams for free. Visit the organization's website for the most recent information.

100 km

Ultra 100km

100 km

Relay