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.

Course marking is excellent, and you’ll be supported by some of the best volunteers on a race course anywhere. We hire professional medical for all aid stations for those occasional skinned knees and such. Our 2023 runners will receive ultra-specific goodies along with their finisher’s award.

Sustainability. Diversity. Community.

The Miwok 100K has focused on sustainability for over a decade, and is an industry leader in recycling, food composting, and waste minimization. The race has been cup-less since 2013. Leftover food is donated to a local shelter.

We are now a proud member of 1% For The Planet in addition to working with TerraCycle to recycle all our race nutrition packaging.

In 2020, we launched the Miwok 100K Diversity Initiative, to further enhance inclusion of under-represented demographics at the Miwok 100K. If you or your company would like to be a part of this initiative, contact Tia Bodington at miwok100k@gmail.com.

Since 2008, we have donated to local organizations that help disadvantaged and hungry children, including The Edible Schoolyard Project and EatLearnPlay.org, providing food and support to kids in the Bay Area. We also donate to Pinkathon/Breast Cancer Research Foundation, Running For A Better Oakland, and other local groups.