Seward Solstice Run
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About the race
Seward Solstice Run is a winter trail race held at Seward Park in Seattle, Washington, offering both a 4.2-mile and a 10k option. The event takes place on Saturday, December 20, 2025, with the start near Seward Park and the loop traversing mostly forested trails on a peninsula beside Lake Washington, highlighting the park’s “Magnificent Forest” of old-growth Western Red Cedar and Douglas Fir. Runners share the single-track, rolling main trail before detouring onto narrower Western-side paths featuring a twisty return with roots and small fallen trees to negotiate.
The day includes a costume contest, aid stations, and Winter Trail Series swag and standings. Visit the organization's website for the most recent information.