Miwok 100K

The Miwok 100K is one of the most beautiful and iconic trail ultramarathons in the world. We believe everyone deserves a shot at something extraordinary. The Miwok100K is about the everyday runner who shows up ready to dig deep on some of the most breathtaking trails around. Set in the Marin Headlands just north of San Francisco, The Miwok 100K offers 62 miles of gorgeous trails, over 11,000 feet of gain, and nonstop views, from redwoods to ridge lines to crashing coastal cliffs. 

The course features single-track trails and dirt roads with about a mile of paved road. The race is 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 2026 runners will receive a custom Miwok 100K finisher’s medal and a Miwok 100K sweatshirt.

We are excited to offer limited Miwok 100K entries with a 16-Week Training Plan, created by 2008 US Olympian & 2015 Western States 100 Champion, Magda Boulet. Our goal is to offer you tips and tools related to training and racing the Miwok 100K course. The Training Plan begins Monday January 12, 2026. Participants will receive an email from Coach Magda with a detailed training plan every 4 weeks, with options for novice and intermediate ultrarunners. Experienced ultrarunners can register for the Training Plan, too, for some fun workout ideas. Our 2026 runners will also receive a custom Miwok 100K finisher’s medal and a Miwok 100k sweatshirt.

And 100% of the revenue from the training plan purchase will support our Community Partners including the wonderful local non-profit Running For A Better Oakland and Ultra Fitness Beyond Imagination.

A fun option to participate in the Miwok 100K Trail Race is running a 4-person Relay team and cover the same 100K course! This is a great option for those who don’t want to or can't race the entire distance and are looking for a fun way to participate in all the action. Same course, same day, same time, but in fun size segments of approximately 26, 9.5, 14 and 13 miles.

The first leg of the relay begins at the start line, heading south all the way to Bridge View and back to Tennessee Valley for the second time. It’s the longest leg of the relay at 26 miles long. Leg #2 takes off from Tennessee Valley and heads North up Mt. Tam to Cardiac. It’s the shortest leg at only 9.5 miles, but the climbing more than makes up for the lack of distance. Leg #3 takes over at Cardiac and traverses the beautiful Coastal Trail and ends at the Randall aid station for a cool 14 miles. The anchor leg takes it home from Randall back to Stinson Beach and is 13 miles long.

All 2026 team relay runners will receive a custom Miwok 100K finisher’s medal and a Miwok 100k Sweatshirt.