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United States
California
Marin County

White Hill Open Space Preserve

The best MTB trails in White Hill Open Space Preserve

4.7

(188)

1,535

riders

60

rides

If you've ever tried to plan mountain biking in White Hill Open Space Preserve, you know how quickly the sheer number of trails can feel overwhelming. With so many options, it's tough to tell which routes are genuinely worth your time and effort, and which are just filler. That's where we come in: our komoot community has ridden, reviewed, and mapped these trails, so we’ve curated a shortlist of the best mountain biking trails in White Hill Open Space Preserve to save you the guesswork.

Mountain biking here is all about diverse terrain, from wide, multi-use fire roads that climb through woodlands to challenging singletrack sections. You'll find yourself winding through serene groves of coast live oak and redwood, then breaking out into open grasslands with panoramic views of Marin County. The preserve acts as a vital gateway, connecting to a larger system of trails including Loma Alta and Camp Tamarancho, though it's worth noting that trails within Camp Tamarancho require a permit.

If you only do one ride, we'd start with the Porcupine Trail – Camp Tamarancho Trailhead loop from Woodacre, a moderate 8.3 miles (13.3 km) route that gives you a fantastic mix of fire roads and singletrack. For a longer, more challenging day with significant elevation gain and expansive views, the Pine Mountain Loop at 15.6 miles (25.2 km) is a local favorite. With over 1,500 mountain bikers having explored these routes with komoot, you can trust you're in good company.

Last updated: May 29, 2026

5.0

(1)

17

riders

#1.

Porcupine Trail – Camp Tamarancho Trailhead loop from Woodacre

13.3km

01:17

340m

340m

Moderate mountain bike ride. Good fitness required. Advanced riding skills necessary.

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Moderate

4.0

(1)

9

riders

Moderate mountain bike ride. Great for any fitness level. Advanced riding skills necessary.

Moderate
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4.3

(3)

15

riders

25.2km

02:37

720m

720m

The Pine Mountain Loop offers a challenging mountain biking experience through Marin County's scenic landscapes. You'll navigate primarily fire roads, but expect very rocky and steep sections, some with grades over 20%, that demand technical skill. The route rewards your effort with expansive views of the San Francisco Bay and Tomales Bay, and a unique passage through a dwarf Sargent cypress forest.

This moderate 15.6-mile (25.2 km) loop involves a significant 2349 feet (716 metres) of elevation gain, typically taking around 2 hours and 36 minutes. Winter flooding can create ruts, so be prepared for potentially rougher conditions. The trail can feel remote in parts, so carry enough water and supplies for the duration of your ride.

Beyond the physical challenge, this trail is steeped in mountain biking history, overlapping with Repack Road, considered a birthplace of the sport. It also forms part of the long-standing Thanksgiving Day 'Appetite Seminar' ride. The route offers a substantial, winding descent if ridden clockwise, but watch out for the notorious 'ET curve' known for spills.

Moderate

The Phoenix Lake – Fish Gulch trail junction loop from Fairfax offers a dynamic mountain biking experience, weaving through varied terrain and stunning landscapes. You'll navigate everything from steep fire roads, like the challenging Fish Grade, to flowing singletrack on the Upper Fish Gulch Trail, all while enjoying views of the emerald-blue Phoenix Lake. This moderate 18.5-mile (29.8 km) route, with its 2092 feet (638 metres) of elevation gain, takes about 2 hours and 38 minutes, making it a rewarding ride for those with good fitness.

Starting from Fairfax, this loop requires preparation for its diverse conditions, including some sections that are steep enough to warrant pushing your bike. While specific parking information isn't detailed, arriving early is always a smart move to ensure a smooth start to your ride. Be ready for a mix of shaded paths and open stretches, and consider the time of day for optimal riding conditions.

This trail is strategically located within the Mount Tamalpais Watershed, making the Fish Gulch junction a central point for exploring further. It serves as a gateway to other lakes and the peaks of Mount Tamalpais State Park, offering immense views towards the San Francisco Bay. The Fish Grade Multi Trail is particularly notable for its steep, fun descent to Phoenix Lake, setting it apart from typical Marin County fire roads.

Moderate

Easy mountain bike ride. Great for any fitness level. Suitable for all skill levels.

Easy
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Tips from the Community

Eric Cross
August 10, 2025, Phoenix Lake

log cabin at phoenix lake

1

0

From easiest to hardest climbs out of phoenix lake from this junction: -Shaver Grade, easy grade, longer, shaded and pretty -Eldridge Grade, medium, good length and can connect you to mt tam east peak -Fish Grade fire road, very steep, we hiked the bikes

1

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georgie
August 10, 2023, Gestalt Haus

Great spot post hiking or biking, good beer, good vibes, great food, and vegan options!

0

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On Shaver Grade Road, you get to ride along the incredibly blue waters of Phoenix Lake.

1

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LadyDi
April 18, 2022, Lagunitas Trail

This is an easy gravel road along the shore of Lake Lagunitas. If you run out of water just follow the trail around the lake until you hit the parking lot where you can refill your water bottle.

1

0

LadyDi
April 13, 2022, Gestalt Haus

Gestalt Haus is a great get together for cyclists. The restaurant has an indoor bicycle garage, european craft beers and great sausages. What else can you wish for after an awesome mountain bike loop?

1

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This is the trailhead to several excellent mountain biking trails at Camp Tamarancho. There is $6 day pass required to ride.

1

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Strategic intersection of three trails/forest roads

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Frequently Asked Questions

How many mountain bike trails are available in White Hill Open Space Preserve?

White Hill Open Space Preserve offers a wide selection of mountain bike trails, with over 60 routes recorded on komoot. These range from wide fire roads to challenging singletrack, catering to various skill levels.

What is the best time of year to go mountain biking in White Hill Open Space Preserve?

The preserve is enjoyable year-round, but spring is particularly vibrant with wildflowers. Conditions can vary seasonally; checking local weather and trail reports before heading out is always a good idea. The terrain includes rougher, rockier sections, which can be affected by rain.

Are there mountain bike trails suitable for beginners or families in White Hill Open Space Preserve?

Yes, while many trails are intermediate to difficult, there are options suitable for less experienced riders. The preserve features 5 easy routes and 36 moderate routes. For a moderate option, consider the Porcupine Trail loop from Woodacre, which offers a shorter path through varied woodlands.

What kind of views can I expect while mountain biking in White Hill Open Space Preserve?

The preserve is renowned for its outstanding panoramic views, especially from the White Hill summit (1,404 to 1,430 feet). From here, you can see Mount Tamalpais, San Pedro Mountain, Mount Diablo, Loma Alta, and the expansive San Francisco Bay.

Are there any challenging mountain bike trails for experienced riders?

Absolutely. White Hill Open Space Preserve features 23 difficult routes, with challenging climbs and rougher, rockier sections. For a demanding ride, consider the Hoo-Koo-E-Koo Fire Road Trail – Bon Tempe Dam loop from Fairfax, which covers over 41 km with significant elevation gain.

What are the rules regarding dogs on mountain bike trails in White Hill Open Space Preserve?

Rules for dogs in open space preserves can vary. Generally, dogs are permitted on trails but must be kept on a leash. It's always best to check the specific regulations of the Marin County Open Space District for White Hill Preserve before your visit to ensure compliance.

Are there any notable natural features or landmarks to look out for?

Yes, the preserve boasts diverse natural environments, including varied woodlands with coast live oak, California bay, and redwood trees, as well as open grasslands and chaparral-covered hills. Higher elevations reveal unique serpentine rocks and rare plants. There's also a historical B-17 bomber crash site from 1946.

Are there any loop trails for mountain biking in White Hill Open Space Preserve?

Many of the mountain bike routes in the preserve are designed as loops, allowing for varied explorations. A popular moderate loop is the Porcupine Trail – Camp Tamarancho Trailhead loop from Woodacre, offering a mix of fire roads and singletrack.

What do other mountain bikers enjoy most about the trails in White Hill Open Space Preserve?

The area is highly rated by the komoot community, with an average score of 4.7 stars from over 170 reviews. Reviewers often praise the diverse terrain, from varied woodlands to challenging singletrack, and the extensive network that connects to adjacent preserves, offering endless exploration possibilities.

Is there public transport access to White Hill Open Space Preserve?

While the preserve is primarily accessed by car, some areas might be reachable via Marin Transit routes. It's advisable to check specific bus schedules and stops that align with trailheads, particularly those near Fairfax or Woodacre, for the most up-to-date public transport information.

Where can I find parking for mountain biking in White Hill Open Space Preserve?

Parking is available at various trailheads around the preserve. Common access points are often found off Sir Francis Drake Blvd. and near towns like Woodacre and Fairfax. Specific parking details can usually be found on local park authority websites or within komoot tour descriptions.

Are permits required for mountain biking on all trails in White Hill Open Space Preserve?

Most trails within White Hill Open Space Preserve do not require a special permit for mountain biking. However, some adjacent trail systems, such as certain trails within Camp Tamarancho, are permit-only. Always check the specific rules for any trails you plan to ride, especially if venturing into connected preserves.

What types of trees and plants can I see along the trails?

The preserve features a rich variety of plant life. You'll encounter varied woodlands with coast live oak, California bay, and redwood trees. Higher elevations showcase stands of manzanita and chamise. In spring, the area bursts with wildflowers like iris, lupines, California poppy, and blue larkspur.

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