4.8
(102)
1,209
riders
51
rides
Mountain biking in Thornewood Open Space Preserve (Closed Area) is not permitted within the preserve itself, which is a 167-acre natural area in the Santa Cruz Mountains. The preserve features diverse forests of redwood, Douglas fir, oak, and madrone, with rolling hills and shaded paths. However, the broader area near Thornewood Open Space Preserve offers a network of mountain bike trails. These routes are characterized by varied terrain, including forested landscapes and significant elevation changes.
Last updated: June 24, 2026
5.0
(7)
35
riders
28.3km
03:25
650m
650m
Hard mountain bike ride. Good fitness required. Advanced riding skills necessary. Some portions of the route may require you to push your bike.
5.0
(5)
64
riders
10.0km
01:10
350m
350m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.

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4.0
(1)
21
riders
16.4km
01:54
570m
570m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
8
riders
Moderate mountain bike ride. Good fitness required. Advanced riding skills necessary.
5.0
(6)
145
riders
36.3km
04:04
1,150m
1,150m
Hard mountain bike ride. Very good fitness required. Suitable for all skill levels.
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Popular around Thornewood Open Space Preserve (Closed Area)
This fun, flowy singletrack may be best for intermediate riders, although there aren't many technical sections to intimidate beginners. If you ride from south to north, it's mostly a gentle downhill. Other trail users are allowed here too, so please keep an eye out!
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Skegg's Point, right off of Skyline Boulevard, has panoramic views of the surrounding peaks.
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Morena Sierra is a peak within the Santa Cruz Mountains with an elevation of 2,417 feet; not to be confused with the Morena Sierra range of Spain.
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This pond rests atop the San Andreas Fault, causing an indentation that later filled up from an underground spring. Unfortunately, the water isn't easily visible due to the overgrowth of cattails in the area. Nonetheless, it remains a beautiful natural spot worth the effort to explore.
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At an estimated age of 1860 years and reaching a towering height of over 200 feet at its tallest point and with a trunk diameter of 14 feet, this remarkable tree stands as one of the few remaining first-growth trees in the region. Witnessing its grandeur firsthand is essential to fully comprehend its immense magnitude.
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What a great singletrack! The part from the end of North Leaf down to the bottom is one of the best trail segments in the park.
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Skeggs (El Corte de Madera Creek Open Space Preserve) is one of the best mountain biking locations in the Bay Area. The park features lots of trails, many of them first-class singletrack. No matter what if you are an advanced rider or a beginner, you will find the perfect loop in this trail area.
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Popular meeting point for mountain bike rides along Skyline and El Corte de Madera Preserve on the West. Sweeping views from the overlook to the East.
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No, mountain biking is explicitly not permitted within Thornewood Open Space Preserve itself. The preserve is a natural area dedicated to hiking and horseback riding, and its regulations prohibit bicycles.
While Thornewood Open Space Preserve does not allow mountain biking, the surrounding Santa Cruz Mountains offer excellent opportunities. This guide features routes in nearby areas like El Corte de Madera Creek Open Space Preserve and trails accessible from Portola Valley.
The mountain bike trails in the broader area near Thornewood Open Space Preserve cater to various skill levels. You'll find a mix of easy, moderate, and difficult routes. For example, many trails, such as the Mountainbike loop from El Corte de Madera Creek Open Space Preserve, are rated as moderate.
Yes, for experienced riders seeking a challenge, there are longer and more difficult routes. The Skeggs loop is a difficult trail spanning over 36 km with significant elevation gain. Another demanding option is the Old Ranch Trail β White Oak Trail loop from Portola Valley, which covers nearly 39 km.
Yes, many of the mountain bike routes in the area are designed as loops, offering a convenient way to explore without retracing your steps. Examples include the Resolution Trail β North Leaf Trail loop from El Corte de Madera Creek Open Space Preserve and other loops originating from El Corte de Madera Creek Open Space Preserve.
The mountain bike routes in the broader area are highly rated by the komoot community, with an average score of 4.7 stars from over 100 reviews. Users often praise the diverse forests, rolling hills, and shaded paths that characterize the network of trails.
While Thornewood Open Space Preserve itself is not for biking, the wider region offers trails that can be suitable for families, depending on their experience level. Look for routes specifically marked as 'easy' or 'moderate' and consider the distance and elevation gain to ensure it's appropriate for all family members.
The Santa Cruz Mountains generally offer good mountain biking conditions for much of the year. Spring brings wildflowers and pleasant temperatures, while fall provides beautiful autumn colors. Summers are typically warm but many trails are shaded. Winters can be wet, leading to muddy conditions, so checking trail status before heading out is advisable.
Dog policies vary by specific park or preserve in the Santa Cruz Mountains. While Thornewood Open Space Preserve allows dogs on leash, you should always check the regulations for individual trail networks like El Corte de Madera Creek Open Space Preserve to confirm their specific rules regarding dogs on mountain bike trails.
The mountain bike trails in the Santa Cruz Mountains wind through diverse forests, including second-growth redwood, Douglas fir, oak, and madrone woodlands. You'll experience rolling hills and shaded paths, with opportunities to spot local wildlife and enjoy scenic views of the natural surroundings.
While Thornewood Open Space Preserve offers glimpses of the southern San Francisco Bay and Palo Alto from certain points, the mountain bike trails in the surrounding areas also provide scenic vistas. Many routes traverse ridge lines or open sections that offer expansive views of the forested hills and valleys of the Santa Cruz Mountains.


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