The best traffic-free bike rides in Horse Hill Open Space Preserve
4.7
(17)
378
riders
19
rides
Gravel biking in Horse Hill Open Space Preserve offers a diverse terrain of fire roads and single-track paths, suitable for various skill levels. The preserve features expansive open spaces and rolling hills, characteristic of Marin County. Cyclists can experience varied elevation gains and trails that are generally not overly steep, providing enjoyable rides through mature oak woodlands and open landscapes.
Best no traffic gravel bike trails in Horse Hill Open Space Preserve
- The most popular no traffic gravel bike trail is Alpine Dam β Fish Gulch trail junction loop from Alta, a 35.1 miles (56.4 km) trail that takes about 4 hours to complete. This difficult route offers varied terrain and panoramic views.
- Another top favourite among local gravel bikers is Lagunitas Trail loop from Corte Madera, a difficult 23.7 miles (38.1 km) path. This route winds through rolling hills and open spaces, providing a sense of freedom and vastness.
- Local gravel bikers also love the Old Mine Trail (lower) π² loop from Mill Valley, a 29.5 miles (47.4 km) trail leading through mature oak woodlands, often completed in about 4 hours 25 minutes.
- Gravel biking in Horse Hill Open Space Preserve is defined by rolling hills, open spaces, and mature oak woodlands. The network offers options for different ability levels, from moderate to difficult routes.
- The routes in Horse Hill Open Space Preserve are highly rated by the komoot community with an average score of 4.7 stars from more than 10 reviews. More than 400 gravel bikers have used komoot to explore Horse Hill Open Space Preserve's varied terrain.
Last updated: July 10, 2026
4.8
(6)
73
riders
47.4km
04:21
1,270m
1,270m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
15
riders
45.7km
03:59
1,180m
1,180m
The Phoenix Lake β Fish Gulch trail junction loop from Mill Valley offers a demanding yet incredibly scenic gravel biking adventure. You'll wind through diverse landscapes, from the cool shade of redwood forests to sun-drenched oak woodlands and open grasslands, with the promise of sweeping views of the Pacific Ocean and Golden Gate Bridge from higher points near Mount Tamalpais. This route is a true test of endurance, featuring steep and loose sections that demand very good fitness and bike handling skills.
Planning your ride requires a bit of foresight; while much of the loop is prime for gravel biking, be aware that the immediate trails around Phoenix Lake itself may not allow bikes. Parking is generally available in Mill Valley, but it's always wise to arrive early, especially on weekends, to secure a spot. Given the route's length and elevation, pack ample water and snacks, and consider starting early to make the most of the daylight.
This loop is a standout in the Mill Valley area, celebrated by local gravel bikers for its challenging terrain and the opportunity to combine dirt climbs with rewarding road descents. It showcases the region's extensive trail network and significant elevation gains, making it a prime destination for those looking to push their limits and experience the natural beauty of Marin County.
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10
riders
51.6km
04:12
1,200m
1,200m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
9
riders
20.2km
01:32
460m
460m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
5.0
(2)
28
riders
45.1km
03:18
770m
770m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
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Popular around Horse Hill Open Space Preserve
Tips from the Community
Batterij Townsley is a place where nature and history meet. As you climb along the rugged cliffs of the Marin Headlands, the old coastal defense slowly emerges from the landscape. Once at the top, a panorama opens up that will leave you speechless: the Pacific Ocean, the Golden Gate Bridge, and the endless horizon. The abandoned bunkers and tunnels give the place a mysterious atmosphere, as if time has stood still here. A perfect stop to enjoy, wander, and completely immerse yourself in the view.
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Part of the coastal defenses along Coastal Trail, latest remnants here date from the WW II and early cold war era.
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Mount Tamalpais State Park is a majestic area in the heart of Marin County, with sweeping hillsides covered in fantastic redwood forest, open grasslands, sturdy chaparral, and wooded oaklands. The views from Mount Tampais boast breathtaking vistas of the Pacific Ocean, San Francisco Bay and City, the Marin County Hills, Mount Diablo, and the East Bay. You can even see the Farallon Islands, 25 miles out to sea. If you're lucky, you can catch an occasional glimpse of the snow-capped Sierra Nevada Mountain Range, nearly 150 miles away. The Park is a haven for cyclists, hikers, wildlife watchers, or those who wish to find a beautiful spot for an afternoon picnic.
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This tidal sanctuary runs along the Mill Valley-Sausalito Pathway and the Charles F. McGlashan Pathway. More than 400 species of migratory birds rest here after their long flights, and if you pass through in the early morning or late evening, the sunrises and sunsets reflect beautifully on the surface of this 106-acre marsh.
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There is a great view of the northern point of Alpine lake where a small channel feeds over to Bon Tempe Lake. This is a great place to drop a line, or just enjoy the aquatic views.
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There are, indeed, horses on this hill. Connector path between Mill Valley and Corte Madera, easier than Camino alto. The alto tunnel is still closed, learn more here: https://openaltotunnel.org/
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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
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Frequently Asked Questions
How many no-traffic gravel bike trails are available in Horse Hill Open Space Preserve?
Komoot features over 20 no-traffic gravel bike trails in Horse Hill Open Space Preserve. These routes offer a fantastic way to explore the preserve's diverse terrain and stunning views without vehicle interference.
What kind of terrain can I expect on gravel bike trails in Horse Hill Open Space Preserve?
The preserve offers a varied landscape, primarily featuring rolling hills, open spaces, and mature oak woodlands. You'll encounter a mix of fire roads and single-track paths, which are well-suited for gravel biking. The trails generally avoid overly steep sections, providing enjoyable rides with diverse elevation gains.
Are there any family-friendly no-traffic gravel bike routes in Horse Hill Open Space Preserve?
While many routes in the preserve are rated as difficult, the varied terrain includes paths suitable for different skill levels. For families, look for routes that connect to dedicated paved bike paths or explore the less steep fire roads. Always check the route details for elevation and distance to ensure it matches your family's capabilities.
What are the best viewpoints or natural features to look out for on these trails?
Cyclists are treated to breathtaking panoramic views of the San Francisco Skyline, Richardson Bay, and the majestic Mount Tamalpais. On clear days, the Tiburon Peninsula is also visible. Keep an eye out for the iconic herd of horses grazing peacefully, seasonal springs in winter, and vibrant wildflower displays in spring. You might also spot raptors like American kestrel and red-tailed hawks soaring above.
What is the best time of year to go gravel biking in Horse Hill Open Space Preserve?
Spring is particularly beautiful, with the preserve bursting with wildflowers like lupine and Douglas iris. Winter brings seasonal springs to life. The rolling hills and open spaces are enjoyable year-round, but always check local weather conditions, especially during hotter summer months or after heavy rains when some trails might be muddy.
Are there any loop routes for gravel biking in the preserve?
Yes, many of the gravel bike trails in Horse Hill Open Space Preserve are designed as loops, allowing you to start and end at the same point. An example of a challenging loop is the Alpine Dam β Fish Gulch trail junction loop from Alta, which offers extensive riding through varied terrain.
What do other gravel bikers enjoy most about riding in Horse Hill Open Space Preserve?
The area is highly rated by the komoot community, with an average score of 4.7 stars. Reviewers often praise the stunning panoramic views, the peaceful, traffic-free environment, and the diverse terrain that makes for an engaging gravel biking experience.
Can I connect to other preserves or areas from Horse Hill Open Space Preserve?
Yes, Horse Hill Open Space Preserve offers routes that can extend into the Alto Bowl Preserve and beyond, providing opportunities for longer rides and exploring a wider network of trails. This connectivity allows for varied and extended gravel biking adventures.
Are there any challenging gravel bike routes for experienced riders?
Absolutely. Many routes in the preserve are rated as difficult, offering significant elevation gains and longer distances for experienced gravel bikers. For instance, the Lagunitas Trail loop from Corte Madera covers nearly 40 km with over 1100 meters of elevation gain, providing a substantial challenge.
Where can I park when visiting Horse Hill Open Space Preserve for gravel biking?
While specific parking areas are not detailed in the route data, Horse Hill Open Space Preserve is generally accessible with designated parking facilities. It's advisable to check local park information or the starting points of specific komoot tours for the most convenient parking options near your chosen trail.
What kind of wildlife might I encounter on the trails?
Beyond the iconic horses, the preserve is home to a healthy vole population, which in turn attracts various raptors. Keep an eye on the skies for American kestrel, red-tailed hawks, and northern harriers. The diverse ecosystem also supports other local wildlife, making for an engaging natural experience.
Are there any alternatives for no-traffic gravel biking if Horse Hill is busy?
While Horse Hill Open Space Preserve is known for its peaceful, no-traffic trails, the broader Marin County area offers numerous other preserves and open spaces with similar gravel biking opportunities. Exploring nearby areas like Alto Bowl Preserve can provide additional options for quiet, scenic rides.
Most popular routes in Horse Hill Open Space Preserve
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