Miwok 100K
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About the race
The Miwok 100K presented by The North Face is an ultramarathon on trails in the Marin Headlands north of San Francisco with a start and finish at Stinson Beach. The course covers 62 miles with more than 11,000 feet of climbing and passes redwood stands, ridgelines, and coastal cliffs. The event includes a 100K individual race and a relay option, well-marked trails, staffed aid stations with professional medical care, and intermediate cutoffs tied to permit and safety requirements.
The race operates with a field limit of 400 runners and a time limit of 15 hours and 30 minutes. Registration opens on November 7, 2026; additional registration details and relay information are provided by the organizer. The event maintains sustainability practices as a cup-less, low-waste event and partners with 1% for the Planet and Leave No Trace. Since 2020, the Bridge to Trails Initiative has aimed to expand access and representation for Black, Indigenous, and People of Color in trail running. Volunteers support race operations and those who volunteer at least eight hours earn priority registration for the following year. The event is an indexed UTMB 100K race and a WS100 2028 qualifier. Visit the organization's website for the most recent information.
