Carkeek 12 Hour
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Event overview
The Carkeek 12-Hour is scheduled as an in-person event on October 25, 2025, with a virtual option available October 1-31, 2025. The event takes place at Carkeek Park in Seattle, Washington (950 North West Carkeek Park Road). Registration is capped for this event series at 50 runners. Proceeds and donations support Endless Trails, a 501(c)(3) nonprofit that funds trail work, education, and advocacy in the Northwest. Organizers note that in-person operations may include COVID precautions such as social distancing in communal areas.
Course and format
The event offers timed running options for 12 hours and 6 hours on a looped trail course. The loop is 1.93-mile long and has about 436' of elevation gain per loop. The course includes varied terrain and stairs, with views of Puget Sound. The event is described as low-impact: paper products are not used and aid and raffle items are sourced largely from local Seattle-area businesses. Costumes are encouraged and costume prizes are awarded, including for pets. Registration details, aid station arrangements, and participant information are provided to registrants ahead of race weekend. Visit the organization's website for the most recent information.