Prepare for a challenge like no other at the Carkeek 12 Hour, returning on October 24, 2026, for its 20th annual edition in Seattle's stunning Carkeek Park. Renowned as "the toughest 12-hour out there," this race features a relentless 1.93-mile loop that packs 436 feet of elevation gain with each circuit. Runners will navigate a diverse course of rolling trails, steep stairs, and a few "flat" sections, all while enjoying gorgeous views of the Puget Sound and vibrant fall canopies. With typical race day conditions seeing highs around 58°F and lows around 44°F, and an 18% chance of precipitation, be ready for anything—Carkeek in the rain is part of the legendary fun. Whether you tackle the full 12-hour endurance test or opt for the 6-hour challenge, this race promises to push your limits.

Beyond the physical demands, the Carkeek 12 Hour is celebrated for its festive and low-key atmosphere. Falling on Halloween weekend, costumes are highly encouraged and rewarded, adding a unique, playful twist to this ultra-distance event. The aid station, located at the start/finish, is a hub of encouragement and offers "awesome aid" with a focus on local businesses and tasty ultra fare, including homemade soup. True to its roots, the race is a fundraiser for Endless Trails, with all proceeds benefiting local trail work and advocacy, particularly within Carkeek Park itself. Expect hand-made bibs, lap counting with star stickers, and unique swag like a Ring Pop medal and Halloween candy, reflecting the event's commitment to community and fun.

The Carkeek 12 Hour isn't just a race; it's a unique opportunity to test your mettle on a notoriously difficult yet beautiful course, train for other technical ultras, and experience the supportive, spirited camaraderie that defines the Pacific Northwest trail running scene. Come for the challenge, stay for the views, and leave with a profound sense of accomplishment and a smile.