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Santa Clara County

Sierra Azul Open Space Preserve

The best MTB trails in Sierra Azul Open Space Preserve

4.6

(285)

2,253

riders

78

rides

Mountain biking in Sierra Azul Open Space Preserve offers a diverse network of trails within a protected natural area. The preserve features significant elevation changes, with routes ascending peaks like Mount Umunhum and Collords Peak. The terrain includes varied landscapes, from forested sections to open hillsides, providing a range of riding experiences. These trails are characterized by their natural surfaces and often provide expansive views of the surrounding region.

Best mountain bike trails in Sierra Azul Open Space Preserve

  • The most popular mountain bike trail is Mount Umunhum Loop, a 13.8 miles (22.3 km) trail that takes 2 hours 22 minutes to complete. This moderate route offers sustained climbing to Mount Umunhum.
  • Another top favourite among local mountain bikers is Mount Umunhum – Mount Umunhum loop from Almaden Quicksilver County Park, a difficult 20.0 miles (32.3 km) path. This route features challenging ascents and descents through varied terrain.
  • Local mountain bikers also love the Collords Peak – Kennedy Trail loop from Heintz Open Space, a 7.9 miles (12.7 km) trail leading through hilly terrain and open spaces, often completed in about 1 hour 38 minutes.
  • Mountain biking in Sierra Azul Open Space Preserve is defined by its challenging climbs, scenic viewpoints, and varied natural surfaces. The network offers options for different ability levels, from moderate loops to difficult long-distance routes.
  • The routes in Sierra Azul Open Space Preserve are highly rated by the komoot community with an average score of 4.6 stars from more than 200 reviews. More than 2000 mountain bikers have used komoot to explore Sierra Azul Open Space Preserve's varied terrain.

Last updated: November 8, 2026

4.7

(3)

25

riders

#1.

Mount Umunhum Loop

22.3km

02:22

680m

680m

This 13.8-mile moderate mountain biking loop in Sierra Azul Open Space Preserve offers challenging climbs and panoramic summit views.
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Moderate

Moderate mountain bike ride. Good fitness required.

Moderate
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Hard mountain bike ride. Very good fitness required.

Hard
Moderate

Moderate mountain bike ride. Good fitness required.

Moderate
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Tips from the Community

Nico
March 31, 2026, Kennedy Trail

This is not a very exciting trail to hike. It’s pretty much a trail surrounded by thick walls of vegetation, with almost no opportunity to view your surroundings. The trail is 70% rocks/gravel, and 30% hard packed clay, so avoid wearing snickers

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Traveler
September 12, 2025, Collords Peak

Great views from the summit.

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If you make the summit a fantastic view awaits. Be aware the road goes down then up to the road about then up again to the summit!…

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Alex
January 10, 2025, Mount Umunhum Trailhead

The Mount Umunhum Trailhead offers some amenities, including bathrooms at both the start and summit. With parking available for about 20 cars, this trail provides great views and is a great spot for sunsets. Aim to hike early in the morning or in the evening as it can get very hot in the summer.

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Alex
January 10, 2025, Forbes Mill Museum

Forbes Mill Museum, housed in a two-story building of the original 1854 flour mill, offers a glimpse into Los Gatos' history. Built by James Alexander Forbes as California's first commercial flour mill, over the years, it served various roles, including a power plant and a PG&E substation. Saved from demolition in 1982, the building now features historical exhibits as part of New Museum Los Gatos.

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Sue
December 7, 2024, English Camp

When the cinnabar (mercury ore) mines at Quicksilver Park were active in the late 19th and early 20th centuries, English Camp housed around 1,000 residents, primarily consisting of Cornish miners and their families. Today, only a few remnants of structures remain. There are some lovely picnic tables here, making it an ideal spot to stop for lunch and take some memorable photos.

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Three of the most popular area trails come together here; depending on how ambitious you are, you might return to this juncture several times as you crank through the forested hills.

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Zachary
September 19, 2024, James J. Lenihan Dam

From the top of the dam you get splendid views out across Lexington Reservoir. To the north you overlook the winding end of the Los Gatos Creek Trail, which connects to the Jones Trail across from the restroom just up the road. The dam itself was constructed in 1952 and stands at nearly 200 feet tall.

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Frequently Asked Questions

How many mountain bike trails are available in Sierra Azul Open Space Preserve?

Sierra Azul Open Space Preserve offers a wide selection of mountain bike trails, with over 60 routes available. These range in difficulty from easy to difficult, ensuring options for various skill levels.

Are there any easy mountain bike trails suitable for beginners in Sierra Azul Open Space Preserve?

Yes, there are several easier options. The preserve features 10 trails rated as easy, providing a good starting point for less experienced riders or those looking for a more relaxed ride. For example, the Los Gatos Creek Trail – Lexington Reservoir loop from Oak Meadow is a moderate route that offers a less strenuous experience compared to the more challenging climbs.

What are the most challenging mountain bike trails in Sierra Azul Open Space Preserve?

For experienced mountain bikers seeking a challenge, Sierra Azul Open Space Preserve has 21 difficult routes. Notable challenging trails include the Mount Umunhum – Mount Umunhum loop from Almaden Quicksilver County Park, which is 20.0 miles long with significant elevation changes, and the even longer Mount Umunhum summit – Mount Umunhum loop from Heintz Open Space, covering 46.5 km with substantial climbing.

Are there any loop trails for mountain biking in Sierra Azul Open Space Preserve?

Yes, many of the mountain bike routes in Sierra Azul Open Space Preserve are designed as loops. For instance, the popular Mount Umunhum Loop is a 13.8-mile moderate route, and the Collords Peak – Kennedy Trail loop from Heintz Open Space offers a 7.9-mile ride through hilly terrain.

What kind of views can I expect on the mountain bike trails in Sierra Azul Open Space Preserve?

The trails in Sierra Azul Open Space Preserve are known for offering expansive views of the surrounding region. Routes that ascend peaks like Mount Umunhum and Collords Peak provide particularly rewarding panoramas. The varied terrain, from forested sections to open hillsides, also contributes to diverse scenic experiences.

What do other mountain bikers say about the trails in Sierra Azul Open Space Preserve?

The mountain bike trails in Sierra Azul Open Space Preserve are highly regarded by the komoot community, with an average rating of 4.6 stars from over 245 reviews. Riders frequently praise the challenging climbs, scenic viewpoints, and the varied natural surfaces that make for an engaging riding experience.

Are there any specific points of interest or landmarks along the mountain bike trails?

Yes, the preserve features several notable points of interest. You can encounter the challenging Mount Umunhum Road (climb), explore the Kennedy Road Sierra Azul Trailhead, or ride along the Priest Rock Trail. The preserve itself, often referred to as Sierra Azul Open Space, offers a rich natural environment.

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

While specific conditions can vary, the preserve's trails are generally accessible for mountain biking during most of the year. However, given the significant elevation changes and natural surfaces, it's advisable to check local weather conditions, especially during the rainy season when trails might be muddy, or during hot summer months when temperatures can be high.

What are the typical trail conditions like in Sierra Azul Open Space Preserve?

The mountain bike trails in Sierra Azul Open Space Preserve are characterized by their natural surfaces. This means you can expect a mix of dirt, gravel, and potentially rocky sections. Conditions can vary with weather, so it's always a good idea to check recent trail reports before heading out, especially after rain.

Is parking available for mountain bikers at Sierra Azul Open Space Preserve?

Yes, there are designated parking areas that provide access to the trails. For example, the Kennedy Road Sierra Azul Trailhead is a known access point, and other trailheads typically offer parking facilities. It's recommended to check specific trailhead information for details on parking availability and regulations.

Are there any cafes or facilities near the mountain biking trails in Sierra Azul Open Space Preserve?

Sierra Azul Open Space Preserve is a protected natural area, so facilities like cafes are not typically found directly within the preserve itself. However, towns and communities bordering the preserve, such as Los Gatos or Almaden Valley, offer various amenities including cafes, restaurants, and shops for pre- or post-ride refreshments.

Most popular routes in Sierra Azul Open Space Preserve

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