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United States
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Marin County

Bald Hill Open Space Preserve

The best gravel rides in Bald Hill Open Space Preserve

4.7

(31)

601

riders

34

rides

Gravel biking in Bald Hill Open Space Preserve offers routes across diverse landscapes, centered around Bald Hill, which rises to 1,132 feet (345 m). The preserve features open grassy slopes, oak woodlands, and wooded lower slopes. An extensive network of fire roads and singletrack trails provides varied terrain for gravel bikers. These paths connect to the larger systems of the Marin Municipal Water District lands, allowing for extended rides.

Best gravel bike trails in Bald Hill Open Space Preserve

  • The…

Last updated: August 25, 2026

5.0

(3)

28

riders

#1.

Fish Gulch trail junction – Phoenix Lake loop from San Anselmo

22.5km

01:45

380m

380m

Moderate gravel ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.

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Moderate

Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.

Hard
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Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.

Hard

Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.

Hard

Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.

Hard
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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.

Translated by Google

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Eric Cross
August 10, 2025, Phoenix Lake

log cabin at phoenix lake

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Alex
May 19, 2025, 680 Trail

The 680 Trail in Marin County has access points at the end of Manuel T. Freitas Parkway via the Mission Pass Bike Path and Fawn Drive. The terrain is fun, rolling trails.

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At the junction of Chicken Shack Fire Road and Ponti Ridge Trail. There are benches, a great view, and trail markers.

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oliviakellis
September 15, 2024, Bon Tempe Lake

West of Lake Lagunitas, Bon Tempe Lake is a reservoir managed by Marin Municipal Water District. It features striking scenery, with lush trees, clear water, and a peaceful atmosphere.

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At this point on Sky Oaks Road, there is a junction with Shaver Grade Road, which connects with a dense network of trails and dirt roads near Bald Hill in the Mount Tamalpais State Park. From here, you can continue on the paved Sky Oaks Road or go arond the gate on to the gravel Shaver Grade Road.

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Matthew
February 14, 2024, Loma Alta Summit

Loma Alta literally translates to "high hill" and is the highest point in the Loma Alta Open Space Preserve. A few different dirt roads and trails lead to the bald summit that looks over the surrounding hillsides.

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Embark on an adrenaline-fueled mountain biking adventure through Big Rock. The trail reaches its peak at the towering landmark, a colossal rock that adds a unique touch to the experience. Exercise caution on the descent; the pavement can get slippery, adding an exhilarating challenge to this thrilling ride.

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Frequently Asked Questions

How many gravel bike trails are available in Bald Hill Open Space Preserve?

There are 38 gravel bike trails available in Bald Hill Open Space Preserve, offering a wide range of options for different skill levels and preferences.

What kind of terrain can I expect on gravel bike trails in Bald Hill Open Space Preserve?

The terrain in Bald Hill Open Space Preserve is diverse, featuring open grassy slopes, oak woodlands, and wooded lower slopes. You'll primarily ride on a network of fire roads and singletrack trails, providing varied surfaces suitable for gravel biking.

Are there any beginner-friendly gravel bike routes in the preserve?

While most routes are moderate to difficult, there is 1 easy gravel bike trail available. Additionally, 15 moderate routes offer a good stepping stone for those looking to build their skills. For example, the Phoenix Lake – Fish Gulch trail junction loop from Fairfax is a moderate route that offers diverse landscapes.

What are the best viewpoints or landmarks to see while gravel biking?

Bald Hill itself, rising to 1,132 feet, offers spectacular 360-degree views from its summit, including vistas of the Ross Valley, Mount Tamalpais, San Francisco and San Pablo Bays, and prominent peaks of the East and North Bay on clear days. The preserve's diverse landscapes, including open grassy slopes and oak woodlands, also provide scenic beauty.

What is the best time of year for gravel biking in Bald Hill Open Space Preserve?

Spring is particularly beautiful due to the abundance of wildflowers, which attract various wildlife. The preserve's open grassy slopes and woodlands are enjoyable throughout much of the year, but clear days offer the best panoramic views from Bald Hill's summit.

Are there any long or challenging gravel bike routes for experienced riders?

Yes, there are 22 difficult routes for experienced gravel bikers. For a significant challenge, consider the Fish Gulch trail junction – Hoo-Koo-E-Koo Fire Road Trail loop from Fairfax, which is 24.6 miles (39.6 km) with substantial elevation gain. Another demanding option is the Fairfax – Big Rock Ridge loop from Fairfax, covering 32.6 miles (52.5 km) with over 1500 meters of ascent.

Is Bald Hill Open Space Preserve suitable for family gravel bike rides?

The preserve offers a mix of terrains. While there is 1 easy route, many trails are moderate to difficult. Families with younger children or those new to gravel biking might prefer to explore the easier sections or shorter fire roads. Always check the route details for distance and elevation before heading out.

What kind of wildlife can I expect to see in Bald Hill Open Space Preserve?

Bald Hill Open Space Preserve is a vital wildlife corridor. You might spot animals like foxes and bobcats. In spring, the preserve is particularly active with wildlife, including anise swallowtail butterflies, savannah sparrows, and dark-eyed juncos, which nest in the tall grasses and low shrubs.

Where can I park when visiting Bald Hill Open Space Preserve for gravel biking?

While specific parking areas are not detailed in the guide, trailheads often have designated parking. It's advisable to check local regulations and parking availability near your chosen starting point, such as Fairfax or San Anselmo, before your ride.

Are there any routes that pass by lakes or reservoirs?

Yes, several routes incorporate water features. The Fairfax – Alpine Lake - Bon Tempe Dam loop from Fairfax, for instance, leads through woodlands and past reservoirs like Alpine Lake and Bon Tempe Dam. Another route, the Fish Gulch trail junction – Alpine Dam loop from San Anselmo, also features Alpine Dam.

What do other gravel bikers enjoy most about Bald Hill Open Space Preserve?

The area is highly rated by the komoot community, with an average score of 4.8 stars from over 9 reviews. Reviewers often praise the diverse landscapes, the extensive network of fire roads and singletrack trails, and the spectacular panoramic views from Bald Hill's summit.

Are there any permits required for gravel biking in Bald Hill Open Space Preserve?

The provided information does not indicate that specific permits are required for gravel biking within Bald Hill Open Space Preserve. However, it's always a good practice to check the official Marin County Parks website or local signage for the most current regulations before your visit.

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