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Carkeek 12 Hour

Seattle, United States • 25 Oct 2025

The Carkeek 12-Hour is a challenging trail running event held annually at Carkeek Park in Seattle, Washington. Celebrating its 19th edition in 2025, the race offers both 12-hour and 6-hour options on a 1.93-mile loop course featuring 436 feet of elevation gain per lap, including rolling trails and steep stairs with scenic views of Puget Sound. Known as one of the toughest 12-hour races, it embraces a fun, festive atmosphere with encouraged Halloween costumes, prizes, and support for costumed pets. The event supports local trails through Endless Trails, a nonprofit, and limits participation to 50 runners to maintain a cozy, old-school vibe. Virtual participation is also available. Visit the organization's website for the most recent information.

United States Washington Seattle

Race information

Website Registration
12 km
12hr
6 km
6hr
Visit the organization's website for the most recent information.
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