Miwok 100K
Stinson Beach, United States • 2 May 2026
Event overview
The Miwok 100K is a trail ultramarathon held in Stinson Beach, California on May 2, 2026. The event is limited to 400 runners and has a total time limit of 15 hours and 30 minutes. Entry options listed for 2026 include the full 100K, a 100K plus a 16-week training plan, and a team relay with teams of four. Age eligibility for the listed events is 18 to 80. When the 100K field is full, a waitlist is used and registered runners who drop before February 1 may receive a $110 (40%) refund.
Course and race services
The course runs in the Marin Headlands north of San Francisco and covers about 62 miles with over 11,000 feet of elevation gain. Terrain includes single-track trails and dirt roads, with about one mile of paved road. The course is described as well marked and supported by volunteers; professional medical staff are provided at all aid stations. Registered finishers for 2026 will receive a custom finisher medal and a sweatshirt. The event has operated as a cup-less, low-waste race since 2013 and lists partnerships with conservation and trail organizations. Visit the organization's website for the most recent information.