Sisu 100 PNW
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SISU 100
SISU 100 is a self supported ultramarathon taking place June 25, 2027, from Camp Sheppard near Enumclaw, Washington, just outside Mount Rainier National Park. The event requires runners to complete 100 miles by running six marked out-and-back mountain trails based from basecamp.
Trail distances range from approximately 3 to 19 miles and include runnable forest roads, steep climbs, waterfalls, ridgelines, and alpine views. Each runner must complete every trail once before repeating any route; after the six unique trails (about 57.5 miles) runners may repeat trails until they reach 100 miles. Runners may not complete the same trail more than twice in a row. Competitors must check in and out at headquarters before and after every trail and must remain on marked trails for each complete effort.
Camp Sheppard serves as basecamp and provides tent space, crew areas, showers, flushing toilets, medical support, and common aid items such as water, electrolytes, and snacks at HQ. Despite these services, the event is self supported: runners are responsible for their food, nutrition, hydration, and gear while on the trails. Required items include a headlamp with extra batteries, hydration pack or bottles, water filtration or purification, visibility markers or glowsticks, a bear bell, a phone or navigation device, backup power, and weather appropriate clothing.
Finishers who reach 100 miles before the official cutoff receive the SISU 100 belt buckle. The event is organized by Side Quest Adventures and follows a weekend schedule with camp opening and check in on Friday, race activity across Saturday, and race conclusion with awards on Sunday. Visit the organization's website for the most recent information.
