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    Miwok 100K Ultramarathon
  • registration
    Miwok 100K Ultramarathon

Registration for the 2025 Miwok 100K opens at 6:00 a.m. on November 9, 2024 on

Entry is first-come first-served and sells out fast.

Along with the 100K and Magda’s Training Plan, we are offering:
The 2024 Miwok 100K Relay was a huge success and will be offered again in 2025 – Limited to 20 teams of 4, a cool new option to participate in the Miwok 100K by forming a 4-person Relay team that covers the same 100K course! This is a great option for those who don’t want to race the ultra 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.

  • Leg #1 begins at the start line, completing the first 26 miles of the course.
  • Leg #2 takes off from Tennessee Valley and heads North through Muir Beach and 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, ending 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.

2025 reg fee is $290, to cover increased permit fees and requirements. See entry form for refund info.

Our 2024 volunteers get 2025 priority registration, and had a blast helping out on race day. Email to sign up for a 2025 volunteer spot and you’ll get priority reg for 2026.

Sign up for Coach Magda’s 18-week Training Plan, to have a fun and successful spring racing season, even if you’re not running the Miwok 100K this year.

2024 Miwok 100K: WS100 2025 Qualifier, and UTMB 2025 Index race.

Email us with any questions:

Co-Race Directors: Tia Bodington & Magda Boulet


The top three finishers in each division (M, F, NB) will receive a special award.

Miwok race finisher pewter medal

Goodie Bags

Miwok 100K participants receive a finisher’s award and Miwok 100K decal, along with extra goodies from our sponsors/partners.

The 2024 Miwok 100K Entrant List will be posted on