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34,045EventsUnited States2026
JUL 2026
7SAT
18
JUL
Outlast Seattle
Sammamish, US
SAT
18
JUL
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B & O Half Marathon and 10k
Orting, US
Outlast Seattle
Saturday, July 18, 2026 · Sammamish, United States
Distances
29km
Start location
About this race
Outlast Seattle is a 6-hour trail endurance challenge. Complete a 5K every hour, on the hour. The course is trail-based, with natural terrain, elevation, and unpredictable conditions, often featuring dirt, rocks, and roots. If you miss a lap, you’re out. Finishing all six rounds earns a Premium OUTLAST medal; 4 or 5 laps get a patch.