Set along Washington State’s scenic East Lake Sammamish Trail, the Lake Sammamish Half Marathon offers a fast, flat course on a well-maintained gravel surface just east of Seattle. Starting near Issaquah and running north toward Redmond, the out-and-back route follows the eastern shore of Lake Sammamish, treating runners to Pacific Northwest forest scenery, mountain views, and glimpses of the lake through the trees.
The course is almost entirely flat, making it an excellent choice for runners chasing a PR or tackling their first half marathon. The packed gravel trail is smooth and forgiving on the joints, and the tree-lined path provides natural shade even on warmer days. With a few hundred participants each year, this race maintains an intimate, community-driven atmosphere without the crowds of larger urban events.
Held each winter, the Lake Sammamish Half Marathon takes advantage of the mild Pacific Northwest climate. The Issaquah area — nestled between the Cascade foothills and the lake — provides a peaceful, nature-immersed setting that feels far removed from nearby Seattle and Bellevue. Runners who appreciate trail-adjacent racing on a flat, fast surface will find this to be one of the best half marathons in the greater Seattle area.
