9 running events in Marin County, California

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 have 3 options for you to participate in our event:

1. Miwok 100K on May 2, 2026 (When the race is full, you will be placed on a Waitlist. Your card will not be charged until you are offered a spot, and accept it. Registered runners who drop prior to February 1 will receive a $124 (40%) refund.

2. Miwok 100K on May 2, 2026, PLUS a 16 week training plan from coach & Race Director Magda Boulet

3. Miwok 100K Team Relay on May 2, 2026 (must have 4 participants per relay)

Please make sure you sign up for the correct event!

Film Premiere: The Cutoff

Thursday, April 2, 2026

Hook Fish Co at Proof Lab Beer Garden

Join us for a special community film night celebrating endurance, storytelling, and trail running culture with the premiere of The Cutoff, a new film by Dylan Harris about the legendary Cocodona 250.

Set against the rugged terrain of Arizona, The Cutoff follows the highs, lows, and relentless pursuit of the finish line in one of the most demanding ultramarathons in the world. Through powerful storytelling and stunning visuals, the film captures what it means to push beyond limits—physically, mentally, and emotionally.

Event Schedule

7:00 PM – Doors open

Grab dinner and drinks available for purchase from Hook Fish Co and the Proof Lab Beer Garden.

7:30 PM – Film screening begins

The Cutoff runtime: 1 hour

Raffle & Giveaways

Stick around for a raffle featuring great prizes from the trail running community, including:

Free East Peak socks

2 pairs of Altra running shoes

2 pairs of Mount to Coast running shoes

Additional gear and surprises

Supporting the Tierra Libre BIPOC Athlete Fund

All proceeds from the event will support the Tierra Libre BIPOC Athlete Fund, an initiative from Tierra Libre Run dedicated to building belonging in trail running.

Belonging is the goal. Tierra Libre Run is created and led by people of color who believe the trail community deserves more than access—it deserves power, joy, and a real home in trail running.

This fund helps athletes through:

Race entry coverage

Mentorship and guidance

Connection to a supportive community

The program begins with a thoughtful application so organizers can understand each athlete’s goals and how best to support them. The vision goes beyond a single race—toward a platform where people can learn, ask questions, build relationships, and truly belong.

You do not need to already be a trail runner to be part of this community. If you’re curious about the trails, Tierra Libre is ready to welcome you.

Come for the film, stay for the community, and help expand access and belonging in trail running.

RACE DAY REGISTRATION AVAILABLE

CLICK HERE FOR RACE DAY DETAILS

Waiting at the Stinson Beach start line will be the only time you spend at sea level during this challenging trail run. From the word "Go" you'll be heading, up, up and away into the thick wooded trails of Muir Woods. You'll follow the legendary Dipsea trail to Steep Ravine, where you'll climb a wooden ladder, march up natural rock and wooden staircases and scramble under tree trunks. Along the way, enjoy the sounds of babbling brooks and waterfalls. Drink in the fresh smell of the towering redwoods and oaks that surround you. Your summit will be rewarded with panoramic vistas as you begin your descent back into Stinson Beach. The event is limited to 300 participants so don't wait too long to register!