Events in Marin County, California | 2026-2027

SFRC Womens Headlands Half Marathon [ultrasignup.com]
Sat, Oct 04, 2025

Half Marathon
Marin County, California, United States
OpenStreetMap Google Maps
Mt. Tam Trail Run [ultrasignup.com]
Sat, Nov 08, 2025

10k 30k 50k Half Marathon Run Trail Ultra
Marin County, California, United States
OpenStreetMap Google Maps
Ross Turkey Trot 2025 [raceroster.com]
Sat, Nov 15, 2025

5k 10k Run
Ross, CA
Marin County, California, 94957, United States
OpenStreetMap Google Maps
Peacock Gap Trail Run [ultrasignup.com]
Sat, Dec 06, 2025

10k 30k Half Marathon Run Trail
Marin County, California, United States
OpenStreetMap Google Maps
Miwok 100K [miwok100k.com] [Register at runsignup.com]
Sat, Dec 20, 2025 at 5:00 AM
Description
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...
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!
100k Run Trail Ultra
32 Belvedere Ave, Marin County, California, 94970, United States
OpenStreetMap Google Maps
Marin Ultra Challenge [insidetrail.com] [Register at ultrasignup.com] - Facebook - Instagram
Sat, Mar 14, 2026

50k Ultra
11050 Mitchell Road, Marin County, California, 94965, United States
OpenStreetMap Google Maps
The Big Alta [daybreakracing.com] [Register at ultrasignup.com]
Fri, Mar 20, 2026

50k Ultra
Marinwood Community Center, Marin County, California, United States
OpenStreetMap Google Maps
Lag Bon 10K [trailrunningwater.com] [Register at ultrasignup.com]
Sun, Mar 22, 2026 at 8:00 AM

10k
End Of Sky Oaks Road, Marin County, California, 94930, United States
OpenStreetMap Google Maps
The Cutoff, A Film By Dylan Harris x Tierra Libre Fundraiser [aravaiparunning.com] [Register at runsignup.com]
Fri, Apr 03, 2026 at 7:00 PM

Description

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...

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.

Run Trail Ultra
254 Shoreline Hwy, Marin County, California, 94941, United States
OpenStreetMap Google Maps

Broken Arrow Skyrace Marin Headlands Training Run [brokenarrowskyrace.com] [Register at ultrasignup.com] - Facebook - Instagram
Sat, Apr 18, 2026 at 8:00 AM

Run Ultra
247 Shoreline Highway, Marin County, California, 94841, United States
OpenStreetMap Google Maps
2026 Stinson Beach/Muir Woods Marathon, Half Marathon & 7 Mile [envirosports.com] [Register at raceroster.com]
Sat, May 09, 2026 at 8:00 AM

Description

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...

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!

7 Miles 21k Half Marathon Run Trail
Panoramic Highway, Marin County, California, 94970, United States
OpenStreetMap Google Maps
Stinson Beach/Muir Woods Marathon, Half Marathon & 7 Mile [envirosports.com]
Sun, May 10, 2026

7 Miles Half Marathon Marathon Run
99 Puente Del Mar, Marin County, California, 94970, United States
OpenStreetMap Google Maps
China Camp Trail Run [insidetrail.com] [Register at ultrasignup.com] - Facebook - Instagram
Sat, May 23, 2026

5k 10k Half Marathon Run Trail
800 N San Pedro Rd, Marin County, California, United States
OpenStreetMap Google Maps
Dirt Circus - San Francisco [dirtcircus.ultrasignup.com] [Register at ultrasignup.com] - Facebook - Instagram
Sat, Jun 06, 2026 at 8:00 AM

Run
247 Shoreline Hwy, Marin County, California, 94841, United States
OpenStreetMap Google Maps
La Sportiva Table Rock Mountain Race [finishers.com] - Facebook
Sat, Jul 11, 2026

Run Trail
Marin County, California, United States
OpenStreetMap Google Maps
Muir Woods Trail Run [insidetrail.com] [Register at ultrasignup.com] - Facebook - Instagram
Sat, Jul 18, 2026

10k 30k Half Marathon Run Trail
1 Calle Del Sierra, Marin County, California, 94970, United States
OpenStreetMap Google Maps
Rodeo Valley Trail Run [insidetrail.com] [Register at ultrasignup.com] - Facebook - Instagram
Sat, Aug 01, 2026

8k 30k 50k Half Marathon Run Trail Ultra
marin headlands ggnra, Marin County, California, United States
OpenStreetMap Google Maps
Tamalpa Headlands 50K [headlands50k.com] [Register at ultrasignup.com] - Facebook - Instagram
Sat, Aug 15, 2026

50k Kids Ultra
Santos Meadows, Marin County, California, 94841, United States
OpenStreetMap Google Maps

18 events in Marin County, California

Description

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