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MTB trails
United States
California
Marin County

San Geronimo

The best MTB trails around San Geronimo

4.6

(77)

888

riders

43

rides

Mountain biking around San Geronimo offers diverse terrain characterized by forested hills, open ridges, and varied elevations. The region features a network of trails that traverse through woodlands, along fire roads, and past meandering creeks. This area is known for its natural landscapes, including redwood forests, oak woodlands, and views of distant ridgelines. The landscape provides opportunities for both challenging climbs and scenic descents across different ecosystems.

Best mountain bike trails around San Geronimo

  • The most popular mountain bike trail…

Last updated: April 27, 2026

22

riders

#1.

Tamarancho to Cascade Fire Road loop

23.4km

02:30

720m

720m

This 14.5-mile moderate mountain biking loop in Camp Tamarancho offers diverse terrain, redwood groves, and Pacific Ocean views.

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Moderate

4.3

(3)

16

riders

25.2km

02:37

720m

720m

Challenge yourself on the 15.6-mile Pine Mountain Loop mountain biking trail in Marin County, featuring technical terrain and expansive view

Moderate
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5.0

(1)

7

riders

This difficult 21.7-mile mountain biking loop offers challenging climbs, rewarding descents, and diverse scenery in the Mount Tamalpais Wate

Hard

4.6

(9)

66

riders

Hard mountain bike ride. Good fitness required. Advanced riding skills necessary. Some portions of the route may require you to push your bike.

Hard

Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.

Moderate
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Popular around San Geronimo

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Tips from the Community

serge 🚶🐉😊🇧🇪
October 12, 2025, Marin Museum of Bicycling

An absolute must-see for cycling enthusiasts! This museum in Fairfax tells the story of nearly 200 years of cycling history, from 19th-century velocipedes to modern racing bikes. It's also home to the Mountain Bike Hall of Fame, featuring unique specimens and stories about the pioneers of mountain biking. The collection is impressive and authentic—no replicas, but real bicycles that showcase the evolution of technology and design. An inspiring place where you can truly feel the passion for cycling.

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1

0

Quite a bit of elevation climbing on this loop, sure does help having a class 1 e-bike at 67 yrs. Loved the ride!

0

0

Eric Cross
August 10, 2025, Phoenix Lake

log cabin at phoenix lake

1

0

Where Eclipse and Solstice Trails intersect.

0

0

Covered shelter hut, picnic tables, restroom, and parking.

0

0

Sue
October 31, 2023, Fairfax

This town, nestled in the forested hills among unspoiled open space in Marin County, is a nice respite from the large nearby metropolis. It is a quirky, hip place with a small-town vibe filled with restaurants, music venues, and independent shops. Fairfax is home to many musicians who live here, and on any given night, you can find live music featuring local and national touring acts jamming in a relaxed, casual atmosphere. It has a very cycle-friendly culture, and be sure to take the time to visit the Museum of Bicycling while you are here!

1

0

Sue
October 27, 2023, Fairfax

This town, nestled in the forested hills among unspoiled open space in Marin County, is a nice respite from the large nearby metropolis. It is a quirky, hip place with a small-town vibe filled with restaurants, music venues, and independent shops. Fairfax is home to many musicians who live here, and on any given night, you can find live music featuring local and national touring acts jamming in a relaxed, casual atmosphere. It has a very cycle-friendly culture, and be sure to take the time to visit the Museum of Bicycling while you are here!

2

0

Non-profit exhibit of some cool historic bikes, including some of the mountain bikes invented here

0

0

Frequently Asked Questions

How many mountain bike trails are available in San Geronimo?

There are over 50 mountain bike trails around San Geronimo, offering a diverse range of experiences. This includes 5 easy routes, 25 moderate routes, and 21 difficult routes, catering to various skill levels.

What is the typical terrain like for mountain biking in San Geronimo?

The terrain in San Geronimo is characterized by forested hills, open ridges, and varied elevations. You'll find a network of trails traversing woodlands and along fire roads, providing a mix of challenging climbs and scenic descents with views of local reservoirs and distant ridgelines.

Are there mountain bike trails suitable for beginners in San Geronimo?

Yes, San Geronimo offers 5 easy mountain bike routes. These trails are generally less strenuous, making them suitable for those new to mountain biking or looking for a more relaxed ride.

Can I find challenging mountain bike trails in San Geronimo?

Absolutely. There are 21 difficult mountain bike routes in the San Geronimo area. These trails often feature significant elevation gains and technical sections. For example, the Bolinas and San Geronimo Ridge Loop is a difficult 21.7-mile route with expansive ridge views, and the Pine Mountain loop from Lagunitas is another challenging option.

Are there any loop trails for mountain biking in San Geronimo?

Yes, many of the mountain bike trails in San Geronimo are designed as loops, allowing you to start and end at the same point. Examples include the Fairfax – Gestalt Haus loop from Woodacre and the Hoo-Koo-E-Koo Fire Road Trail – Bon Tempe Dam loop from Fairfax.

What do other mountain bikers enjoy most about the trails in San Geronimo?

The mountain bike trails in San Geronimo are highly rated by the komoot community, with an average score of 4.6 stars from over 70 reviews. Users often praise the diverse terrain, from forested sections to open ridgelines, and the scenic views, including those of local reservoirs.

Are there any interesting landmarks or natural attractions along the mountain bike trails?

Yes, the San Geronimo area is rich in natural beauty. You can find highlights such as the Mount Tamalpais Summits, White Hill Summit, and the unique Pygmy (dwarf) sargent cypress forest. Many trails also pass by significant natural monuments like The Big Rock near Skywalker Ranch.

What is the best time of year to go mountain biking in San Geronimo?

While mountain biking is possible year-round, the best times are typically spring and fall when temperatures are mild and the landscape is vibrant. Summers can be warm, and winters may bring rain, which can affect trail conditions, especially on fire roads.

Are there any family-friendly mountain bike options in San Geronimo?

For families, the easier routes are generally the most suitable. These trails offer a less demanding experience, allowing for a more relaxed ride together. Always check the specific trail details for elevation and surface conditions to ensure it matches your family's skill level.

Where can I find parking for mountain biking trailheads in San Geronimo?

Parking availability varies by trailhead. Many popular trailheads, especially those near towns like Woodacre or Fairfax, offer designated parking areas. It's advisable to check specific route details on komoot for information on parking at the start of your chosen trail, such as for the Porcupine Trail – Camp Tamarancho Trailhead loop from Woodacre.

Are there any cafes or places to eat near the mountain bike trails in San Geronimo?

The towns surrounding San Geronimo, such as Fairfax and Woodacre, offer various cafes and eateries where you can refuel before or after your ride. These towns are often conveniently located near popular trail access points.

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