MAY 2, 2026 – 5:00 A.M.

The Miwok 100K is one of the most beautiful and iconic trail ultramarathons in the world.

Registration for the 100K and 4 person Team Relay opens on November 9, 2025 at 6am PST/9am EST on RunSignUp!

RACE STARTING IN

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Photos by Jacob Banta and Tony Di Pasquale.

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.

The Course

Set in the Marin Headlands just north of San Francisco, Miwok offers 62 miles of gorgeous trails, over 11,000 feet of gain, and nonstop views, from redwoods to ridge lines to crashing coastal cliffs. Learn more about the cutoff times and course

Who should run Miwok100K?

This race is for runners who:

Embrace steep climbs, exposed ridges, and fast-changing weather
Have experience with trail ultras and self-supported effort
Respect the land and leave no trace
Can stay ahead of tight intermediate cutoffs (to ensure safety and meet permit requirements)

You don’t need to be elite. But you do need to be prepared.

What Runners Get

A well-marked, scenic, and demanding course
Supportive aid stations and a tight-knit trail community
A Miwok 100K finisher award to be proud of and ultra-specific goodies
A strong community supporting you from training to race day
Professional medical care at all aid stations
The best crew of volunteers

Registration Info

Registration opens: Nov. 9, 2025 at 6 am PST on RunSignUp
Race Date: May 2, 2026 at 5 am PST
Location: Stinson Beach, CA
Field Limit: 400 runners
Registration Opens: November 9, 2025, at 6 am PST
Time Limit: 15 hours and 30 minutes

This race sells out quickly. If you’re ready to train, prepare, and take on a challenge, then we’d love to see you at the starting line.

Sustainability, Diversity, Community

Sustainability & Community

The Miwok 100K is committed to protecting the trails and uplifting the community that makes this race possible. Since 2013, we’ve operated as a cup-less, low-waste event, partnering with 1% for the Planet, Leave No Trace, and GU Energy Labs to reduce our environmental impact.

Through our Diversity Initiative, launched in 2020, we work to expand access and representation in trail running for Black, Indigenous, and People of Color.

Learn more about our commitment →

Volunteers

Be part of the Miwok 100K magic and join our volunteer crew to help create an unforgettable race experience for runners. Volunteering also earns you priority registration for the next year’s race by volunteering at least 8 hours this year. Email Magda Boulet, RD at miwok100K@gmail.com to sign up.

Apparel Collection

The Miwok 100K Apparel Collection is made possible by Pressio. The team at Pressio delivers unparalleled quality, and exist to elevate athletes through superior performance; and to elevate expectation through an uncompromising pursuit of sustainable excellence.

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Sponsors & Partners

Our thanks to the wonderful sponsors and vendors who will be providing cool stuff to our runners. More to come! We’d also like to thank the California State Parks, the Golden Gate National Recreation Area, and Point Reyes National Seashore for their work to manage and maintain the trails on which we love to run!

This year, our donations go to The Cost Miwok of Marin, Running For a Better Oakland & Runners for Public Lands

Race Photography

2025 Professional Race Photography provided by the amazing photographers and trail running community members Tony DiPasquale and Jacob Banta can be found here.

The May 3, 2025 Miwok 100K will be a UTMB 2026 Index Race at the 100K Level.

WS100 2026 Qualifier