Carkeek 12 Hour
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About the race
The Carkeek 6- and 12-hour events return in 2026 with in-person and virtual options. The in-person event takes place at Carkeek Park in Seattle, Washington, and the virtual event runs October 1 to October 31. This is the 20th annual edition and it is organized by Endless Trails, a Northwest 501(c)3 nonprofit. Event proceeds support local trails and Endless Trails operating costs.
The course is a loop measuring 1.93 miles with varied terrain that includes rolling singletrack, steep stairs, and a few flatter sections. Each loop has about 436 feet of elevation gain and offers views of the Puget Sound. The event follows a low-impact approach with no paper products, and aid and raffle items come primarily from local Seattle businesses.
Race operations emphasize a low-key, old-school atmosphere: bibs are handmade and laps are tracked with star stickers. The event is held on Halloween weekend and encourages costume running with prizes for costumed runners, pets, and groups. Family members and well-behaved leashed dogs are welcome. A video course preview is available for those who want to observe the loop in detail.
Distances: Visit the organization's website for the most recent information.
- 12-hour run on a 1.93 mile loop
- 6-hour run on the same 1.93 mile loop
