Centennial 100
Relay and Ultra Run
Sat., June 19, 2027
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About the Centennial 100 Relay and Ultra Run
Are You Ready for the Ultimate Running Adventure?
The Centennial Relay and Ultra Run isn’t just another race—it’s an unforgettable challenge designed for runners of all levels. Covering 100KM of stunning Pacific Northwest scenery, this epic journey takes you along the entire Centennial Trail, from Space 802 in Historic Downtown Snohomish to the Nakashima Barn in Arlington—and back! Whether you’re an ultra warrior taking it on solo or a team player sharing the miles with 1, 2, or 5 others, this is your chance to push your limits, embrace the adventure, and cross that finish line stronger than ever.
How the Relay Works
The Centennial 100 is a 100KM (62-mile) out-and-back course along the Centennial Trail. Runners will start at Space 802 in Historic Downtown Snohomish, travel north to the turnaround at the Nakashima Barn in Arlington, and then make their way back to Snohomish for the finish.
Take on the entire 100K solo or share the miles with a team of 2, 4, or 6 runners.
Relay Legs
The outbound course is divided into six legs:
Relay Legs
The outbound course is divided into six legs:
Start → Machias Park: 5.83 miles
Machias Park → Rhododendron Park: 5.59 miles
Rhododendron Park → Armar Road: 7.09 miles
Armar Road → Legion Memorial Park: 4.47 miles
Legion Memorial Park → Bryant Road: 4.02 miles
Bryant Road → Nakashima Barn: 4.00 miles
Once teams reach Nakashima Barn, they will turn around and complete the same six legs in reverse, bringing the total distance to approximately 62 miles / 100KM.
That means there are 12 total relay legs throughout the day.
Teams are responsible for transporting their runners between exchange points throughout the race. Your team vehicle will move along the course as you support your runners, make exchanges, and work your way to Arlington and back.
Teams may determine how they divide the 12 legs among their registered runners.
Packet Pickup & Race Day Schedule
Packet pickup will take place race morning at Space 802 prior to the start of the race. Additional packet pickup and check-in times will be provided closer to race day.
*2026 Swag. Cowbells! Stay tuned for 2027 swag reveals.
FAQs and Information
Aid Stations & Course Support
There will be 6 aid stations located throughout the course to support runners along the way. At the end of each leg – available hydration and nutrition will be provided closer to race day.
Runners should plan to carry any additional hydration, nutrition, or personal items they may need between aid stations.
Course Cutoff
The course closes at 9:00 PM. All solo runners and relay teams must complete the 100K by the course cutoff.
Additional information regarding start times, timing requirements, and race-day logistics will be communicated prior to the event.
Packet Pickup
Packet pickup will take place race morning at Space 802 prior to the start of the race. Additional packet pickup and check-in times will be provided closer to race day.
Sponsors
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