Outlast Seattle
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OUTLAST Seattle : 6 Hour Challenge
OUTLAST Seattle is a six hour trail endurance event held in Sammamish, WA on 07/18/2026. Participants complete a 5K loop every hour; each lap must be finished within the hour to remain in the event. Runners who miss a lap are removed from further rounds.
The course is trail based with natural terrain, elevation changes, and unpredictable conditions; some sections may include pavement or gravel. Between laps there is time to rest, refuel, and prepare for the next timed 5K. Each 5K is timed individually and a combined time is used for local rankings and the national leaderboard.
Support at the loop start/basecamp includes water, basic hydration, and snacks. This is a cupless event so participants should bring their own bottle or hydration system. Runners may set up a personal tent or aid area at the venue. Recommended gear includes trail shoes, layers, and fuel for between laps.
Finisher recognition is tiered: completing four laps earns a “Grit Earned” patch, five laps earns a “Survivor” patch, and completing all six laps earns a premium OUTLAST medal. All participants receive a premium OUTLAST tee. The fastest combined 5K times for male and female divisions win local awards; top finishers qualify for the Outlast Championship and the national leaderboard offers a separate cash prize for the overall national champion.
Registration opened 07/31/2025 and closed 03/31/2026. The registration fee was $90.00. Visit the organization's website for the most recent information.
