Carkeek 12 Hour

Carkeek 12 Hour

Carkeek 12 Hour is a looped trail running event held at Carkeek Park in Seattle, Washington. The 2026 program includes an in-person event on October 24 and a virtual option that runs October 1 to 31. The event marks its 20th annual running and offers both a 12 hour and a 6 hour format.

The course is a single 1.93 mile loop that features varied terrain, including rolling trails, steep stairs, and a few flatter sections. Each loop records approximately 436 feet of elevation gain. The route offers views of the Puget Sound and is presented with a festive atmosphere during the fall season.

The event limits in-person field size to 50 runners to reduce footprint and preserve a low-key, old-school feel. It emphasizes low-impact practices, such as eliminating paper products, and sources aid station items and raffle prizes from local businesses. Proceeds beyond permit costs support local trails and Endless Trails operating expenses.

Race operations reflect a handmade approach: bibs are created by the organizers and lap counts are tracked with star stickers. The event is held on Halloween weekend and includes costume prizes for individuals, groups, and pets, along with various random awards throughout the day. A video preview of the loop is available for those seeking a course look. Visit the organization's website for the most recent information.