The Miwok 100K is one of the most beautiful and iconic trail ultramarathons in the world. The course is hilly (11,800 feet of gain) but runnable, with spectacular views of San Francisco and the Golden Gate Bridge, Sausalito, Mount Tamalpais, the ancient redwoods and the Point Reyes National Seashore.

The course features single-track trails and dirt roads with about a mile of paved road. The race is very competitive at the front, and a rewarding challenge for all. Less than an hour from San Francisco, the Start/Finish is in the town of beautiful Stinson Beach, nestled against Mount Tamalpais, with its excellent cafés, a small market, lodging, and more.

Our 2021 runners will receive top quality Miwok logo men’s and women’s rabbit race shirts, a super-cool trucker hat, ultra-specific goodie bag items, and a custom Miwok finisher’s medal. Course marking is excellent, and you’ll be supported by some of the best volunteers on a race course anywhere.

SPEAKING OF VOLUNTEERS... we're looking for Aid Station and Finish Area volunteers, and would love to have you join us. Click the volunteer link in the box below.

The Miwok 100K has been a cupless race for almost a decade, and we recycle, compost, and donate leftover food to a local shelter. Our main charity donations go to "Food for Kids" and Breast Cancer Research Foundation, as well as a number of local organizations.

2021 Registration Info

Due to the "covid-cancellation" of the 2020 Miwok 100K, we will not use a lottery for the 2021 event. Spots will be filled first-come, first-served after our 2020 entrants have registered. We will have a waitlist once the entrant list is full to improve runners' chances of getting to run this beautiful ultra - our 25th Miwok.

Registration for the 2020 entrants is on Ultrasignup.com November 1 through November 7, 2020.

At 8:00 a..m. PST on November 8th, registration will open for everyone else. See our Registration page for full details.

We will update the race information on this website in October to reflect current regional regulations regarding sporting events.