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.
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 course.
Who Should Run Miwok?
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 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 6am PST
- Race Date: May 2, 2026
- 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
For over a decade, the Miwok 100K has led the way in sustainability—pioneering recycling, composting, and a cup-less race since 2013. Leftover food is donated to local shelters.
We proudly support 1% For The Planet and Leave No Trace , and partner with GU Energy Labs to TerraCycle all nutrition packaging.
Our Miwok 100K Diversity Initiative, launched in 2020, promotes inclusion of underrepresented groups at the Miwok 100K. To get involved, contact Magda Boulet, RD at miwok100k(at)gmail.com
Organizations we currently donate & support: Running For A Better Oakland |510 Hikers |Runners for Public Lands |The Coast Miwok of Marin |The Nomadic Adventure Club Ultra Fitness Beyond Imagination
Organizations we have donated in the past: The Edible Schoolyard Project |EatLearnPlay.org | Pinkathon/Breast Cancer Research Foundation,
