4.7
(278)
2,215
riders
91
rides
Mountain biking in Camino Alto Open Space Preserve offers a network of trails winding through varied terrain in Marin County. The preserve is characterized by rolling hills, dense woodlands, and open grassy areas, providing diverse landscapes for mountain bikers. Riders can expect a mix of ascents and descents, with opportunities for scenic views across the surrounding region. The area's natural features create a dynamic environment suitable for different skill levels.
Last updated: July 9, 2026
5.0
(11)
75
riders
21.0km
02:02
540m
540m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
5
riders
14.1km
01:29
450m
450m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.

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4.8
(9)
110
riders
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
4.3
(3)
68
riders
43.3km
04:17
1,120m
1,120m
Hard mountain bike ride. Very good fitness required. Suitable for all skill levels.
5.0
(3)
57
riders
44.4km
04:53
1,470m
1,470m
Hard mountain bike ride. Very good fitness required. Suitable for all skill levels.
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This is a great gravel road that takes you from the summit of Mount Tam to West Point. The road is wide and not very technical, but the views south across the foothills to Muir Woods are fantastic.
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Beautiful, quiet bay. With great surroundings. Not too crowded.
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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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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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After looping around West Point the Railroad Grade trail snakes through open and tree-lined sections with fun curves.
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On clear days views open up along the trail across the bay and including the San Francisco skyline
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There are still remnants of old train platforms visible where the Gravity cars used to intersect with the Mt Tam Railroad.
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Uphill from this intersection a portion of the Railroad Grade has been taken over by Fern Canyon Rd after the Mt Tam railroad closed. A short distance uphill on pavement brings you to the end of Fern Cyn. A bit before the end the Railroad Grade gravel forest road splits off again to the right. The Temalpa Trail that joins here is steep with stairs, not open to biking.
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Camino Alto Open Space Preserve offers a range of mountain bike trails suitable for various skill levels. You'll find moderate routes with a mix of climbs and descents, as well as more difficult trails for experienced riders. Overall, there are 10 easy, 60 moderate, and 19 difficult routes available.
Yes, Camino Alto Open Space Preserve has 10 easy mountain bike routes that are suitable for beginners or those looking for a less strenuous ride. These trails typically feature gentler gradients and smoother surfaces, making them ideal for building confidence.
Trail lengths vary significantly. For instance, a popular moderate route like Mountainbike loop from Corte Madera is about 8.8 miles (14.1 km), while longer, more challenging rides such as Old Mine Trail (lower) π² β Miwok Trail loop from Mill Valley can extend to 27.2 miles (43.7 km).
While specific parking lots are not detailed in the trail data, open space preserves in Marin County typically have designated parking areas at trailheads. It's advisable to check local signage or specific route descriptions for the most convenient parking options near your chosen starting point, such as the Camino Alto OSP - Fire Road Trailhead.
Yes, with 10 easy routes, Camino Alto Open Space Preserve offers options that can be suitable for families. Look for shorter, less technical trails with minimal elevation gain to ensure an enjoyable experience for all ages. Always check the specific trail details for suitability before heading out.
The mild climate of Marin County generally makes mountain biking enjoyable year-round. However, spring and fall offer the most pleasant conditions with moderate temperatures and lush scenery. Summers can be warm, and winters might bring rain, making some trails muddy. Always check current weather and trail conditions before your ride.
Mountain biking is generally possible in Camino Alto Open Space Preserve during winter, thanks to Marin County's mild climate. However, winter months can bring rain, which may lead to muddy or slippery trail conditions. It's always best to check local weather forecasts and trail reports to ensure trails are open and safe for riding.
Yes, the preserve's rolling hills and open grassy areas provide opportunities for scenic views across the surrounding region. Trails like Tennessee Valley Trailhead β Old Springs Trail loop from Mill Valley are known for offering varied terrain and scenic vistas. Keep an eye out for spots like Middle Summit / Escalon Fire Road π»π΅ for panoramic views.
Camino Alto Open Space Preserve is home to various wildlife typical of Marin County's natural habitats. Riders might encounter deer, rabbits, and a variety of bird species. Keep a respectful distance and observe from afar to minimize disturbance to the local ecosystem.
The area is highly rated by the komoot community, with an average score of 4.7 stars from over 250 reviews. Reviewers often praise the diverse landscapes, which include rolling hills, dense woodlands, and open grassy areas, as well as the mix of ascents and descents that provide a dynamic riding experience.
While riding, you might encounter interesting features like Camino Alto Road, which offers a unique cycling experience, or the Bob Middagh Trail. These spots provide a glimpse into the preserve's character and history.
Yes, many of the mountain bike trails in Camino Alto Open Space Preserve are designed as loops, offering a convenient way to explore without retracing your steps. Examples include the Mountainbike loop from Corte Madera and the Pantoll Road π² loop from Mill Valley.


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