Registration & Entrants

Miwok 100K Registration Opens November 9, 2025

Registration for the 2026 Miwok 100K opens at 6:00 a.m. PST on November 9, 2025, on RunSignUp.com.
Entry is first-come, first-served and sells out fast.

Race Options

Miwok 100K Individual Race
Run the full 62 miles of the Miwok 100K course. Runners must complete the course within 15 hours and 30 minutes. This challenging ultramarathon features over 11,000 feet of elevation gain and some of the most breathtaking trails in Marin County. Please see here for information about aid stations and cutoff times.

Miwok 100K Relay
Back by popular demand after a successful 2025 debut, the Miwok 100K Relay will return in 2026. Limited to 20 teams of 4, this fun and challenging option lets runners experience the full Miwok 100K course in shorter segments. It’s perfect for those who want to be part of the action without running the full ultra distance.

Leg 1: Start to Tennessee Valley – 26 miles
Leg 2: Tennessee Valley to Cardiac – 9.5 miles
Leg 3: Cardiac to Randall – 14 miles
Leg 4: Randall to Finish – 13 miles

Same course, same start time, same community energy.

Are You Ready For Miwok 100K?

Miwok 100K is not for the faint of heart. Runners will face steep climbs, exposed ridges, fast-changing weather, and long, demanding miles. You do not need to be elite, but you do need to be prepared, disciplined, and ready to push your limits on some of the most breathtaking trails in the world. Please understand the cutoff times.

Get Ready With Coach Magda’s Training Plan

Coach Magda’s 16-week training plan is back! Designed to build strength, endurance, and confidence, it’s the perfect way to prepare for a strong, successful season.

You can add this option during registration; you can register here.

Qualifiers

The 2026 Miwok 100K is a Western States 100 (2027) qualifying race and a UTMB 2027 Index race.

Volunteer Priority Registration

Volunteers are the heart of the Miwok 100K. Our volunteers received priority registration for the following year after they volunteered. If you would like to join the 2026 volunteer crew and earn priority registration for 2027, email miwok100k@gmail.com