This is Seattle’s most festive and masochistic trail event. Runners take on a 1.93-mile loop in scenic Carkeek Park, with 436 feet of elevation gain per loop (yes, per loop!). It’s tough, it’s technical, it’s stunning—and it’s full of Halloween costumes, candy, and endless cheer.

Whether you’re chasing distance PRs, training for a big ultra, or just in it for the camaraderie and spooky fun, Carkeek delivers. Expect steep climbs, rooty singletrack, endless fall color, and the best aid station vibe in the Northwest.