The best gravel rides in Sierra Azul Open Space Preserve
4.7
(16)
197
riders
24
rides
Gravel biking in Sierra Azul Open Space Preserve offers an extensive trail system within the rugged Santa Cruz Mountains. The preserve features significant elevation changes, with trails ranging from challenging climbs on old fire roads to varied terrain including serpentine grasslands, dense oak woodlands, and deep ravines. Prominent peaks like Mount Umunhum and Mount El Sombroso contribute to the landscape, providing panoramic views.
Best gravel bike trails in Sierra Azul Open Space Preserve
- The most popular gravel bike trail is Lexington Reservoir – Los Gatos Creek Trail loop from Oak Meadow, a 15.8 miles (25.4 km) difficult trail that takes 2 hours 21 minutes to complete. This route offers varied terrain around the scenic Lexington Reservoir.
- Another top favourite among local gravel bikers is Mine Hill Trailhead – Mine Hill Trail loop from Almaden Quicksilver County Park, a difficult 15.4 miles (24.7 km) path. This trail navigates through diverse landscapes, including sections of old fire roads.
- Local gravel bikers also love the Mine Hill Trailhead – Lisa Killough Trail loop from Almaden Quicksilver County Park, a 25.4 miles (41.0 km) trail leading through varied terrain with significant elevation gain, often completed in about 4 hours 9 minutes.
- Gravel biking in Sierra Azul Open Space Preserve is defined by rugged and steep landscapes, serpentine grasslands, and dense oak woodland forests. The network offers options for different ability levels, from moderate paths to challenging climbs.
- The routes in Sierra Azul Open Space Preserve are highly rated by the komoot community with an average score of 4.7 stars from over 10 reviews. More than 180 gravel bikers have used komoot to explore Sierra Azul Open Space Preserve's varied terrain.
Last updated: October 15, 2026
5.0
(2)
9
riders
Hard gravel ride. Very good fitness required. Mostly paved surfaces.
12
riders
Hard gravel ride. Very good fitness required. Mostly paved surfaces.
5.0
(1)
12
riders
Hard gravel ride. Very good fitness required. Mostly paved surfaces.
12
riders
51.5km
03:41
890m
890m
Hard gravel ride. Very good fitness required. Mostly paved surfaces.
4.0
(1)
12
riders
37.9km
03:15
1,080m
1,080m
Hard gravel ride. Very good fitness required. Mostly paved surfaces.
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Tips from the Community
Approaching Hicks road from Camden Ave. Avoid this area on Sundays between 8 AM to noon. It gets busy with impatient church people. The first 6 miles are meandering narrow roads with gentle climbs. The famous Hicks Climb starts with a sharp left bend on an old bridge. You face immediately a 14% gradient which is unnerving if it is your first time. The roads gains 800 feet in 1.2 miles. The average gradient of 8% hides the fact that there are some sections with 3-4% gradient in this 1.2 miles. Be patient on the climb. Your speed may drop under 3 MPH at times. Come mentally prepared and have some mantras to boost your spirits during the climb. Slow down on descent. The road surface is cold- sealed asphalt so you get good traction but slow down. The road is steep and there are some potholes and wide cracks here and there. Check your brake pads!! Temperature can have a significant impact. Ride it when it is under 75 degrees and road is not wet. Some riders connect this ride with Mount Umunhum climb totaling to 3100 feet of elevation gain in less than 7 miles of which 1.1 miles are either flat of downhill! Be safe …
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This is a tough climb. It gains 2200 in 5 miles of which 1.1 miles are flat or downhills! There are 3-4 short segments with 15% gradient. The road is exposed so riding when temperature is below 75 is recommended. On summer weekends expect caravans of motorcycles with their fumes and noise. It is a super special experience. Be patient on climb and cautious on the descent. There are restroom facilities but no potable water. This climb is addictive! You will be back! There are locals who climb this road 100+ times annually!
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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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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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Still one of the highest points in the Santa Cruz Mountains, even though the military graded and flattened the actual summit to create an Air Force base. The summit was cleaned of hazardous material in 2009, then carefully restored after a lot of community input. It's a lovely place to visit now!
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Climbing Mount Umunhum is a tough but rewarding challenge. The road is steep, with sections reaching up to 18% grades, so pace yourself. The views from the top are spectacular, making the hard work worth it. Start early to avoid traffic and the heat, and be prepared for a long, demanding ascent.
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Shannon Road starts with a gentle climb from Los Gatos Creek to Blossom Hill Park, then transitions into a steeper ascent as it leads into a rural area. The summit below Blossom Hill offers a rewarding challenge and connects to other routes in the area.
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The Almaden Quicksilver Mining Museum is in the historic 1854 Casa Grande manor. The museum gives visitors a glimpse into the history of mercury (also known as quicksilver) mining and the role it played in the California Gold Rush. Visitors can explore exhibits of 19th-century mining photos, a mine tunnel diorama, and artifacts from mining families. The museum is open Friday through Sunday from 12:00 to 4:00 PM, with a suggested $2 donation for admission, and the museum grounds are open daily from 8:00 AM to sunset.
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Frequently Asked Questions
How many gravel bike trails are available in Sierra Azul Open Space Preserve?
There are over 29 gravel bike routes in Sierra Azul Open Space Preserve, offering a wide range of experiences for riders looking to explore the rugged Santa Cruz Mountains.
How challenging are the gravel bike trails in Sierra Azul Open Space Preserve?
The preserve is known for its rugged and steep landscape, with significant elevation changes. Most routes are rated as difficult, providing a good workout. Trails often consist of old fire roads, which can be persistently steep in some areas, requiring advanced riding skills or even pushing your bike on certain sections.
Are there any beginner-friendly gravel bike routes in Sierra Azul Open Space Preserve?
While many trails are challenging, some sections offer more moderate terrain. For instance, parts of the Lexington Reservoir – Los Gatos Creek Trail loop from Oak Meadow provide varied terrain that can be enjoyed by those with some gravel biking experience, though it is still rated as difficult overall due to elevation changes.
What kind of terrain can I expect on the gravel bike trails?
You'll encounter a diverse environment, including serpentine grasslands, rocky chaparral, dense bay tree stands, shaded oak woodland forests, and deep ravines. The trails often follow old fire roads, which contribute to the significant elevation changes and varied surfaces.
What are some notable landmarks or scenic viewpoints along the gravel bike trails?
The preserve offers expansive views from various points, including the summits of Mount Umunhum and Mount El Sombroso. You can see the Santa Clara Valley, ridgelines, and other Bay Area peaks. The Mount Umunhum Road (climb) leads to the summit of Mount Umunhum, offering incredible panoramic views and the distinctive Cold War-era radar tower.
Are there any circular gravel bike routes in Sierra Azul Open Space Preserve?
Yes, several popular routes are circular. For example, the Mine Hill Trailhead – Mine Hill Trail loop from Almaden Quicksilver County Park and the Mine Hill Trailhead – Lisa Killough Trail loop from Almaden Quicksilver County Park are both excellent circular options that navigate diverse landscapes.
What is the best time of year to go gravel biking in Sierra Azul Open Space Preserve?
The preserve can be enjoyed year-round, but spring and fall generally offer the most pleasant conditions with milder temperatures. Summers can be hot, and some trails may be dusty. Winters bring cooler weather and potential for rain, which can make some trails muddy and challenging.
Is public transport available to reach Sierra Azul Open Space Preserve?
Public transport options directly to the trailheads are limited. Most visitors access the preserve by car, with parking available at various trailheads. It's advisable to check local transit authority websites for the most current information on routes that might get you close to the preserve's edges.
Are permits required for gravel biking in Sierra Azul Open Space Preserve?
Generally, permits are not required for individual gravel biking in Sierra Azul Open Space Preserve. However, it's always a good idea to check the official Midpeninsula Regional Open Space District website for any updated regulations or specific trail closures before your visit.
What do other gravel bikers enjoy the most about gravel biking in Sierra Azul Open Space Preserve?
The area is highly rated by the komoot community, with an average score of 4.7 stars. Reviewers often praise the challenging climbs, the diverse and rugged landscapes, and the rewarding panoramic views from the peaks. The extensive multi-use trail system is also a significant draw.
What kind of wildlife might I encounter while gravel biking?
The varied habitats of Sierra Azul are home to abundant wildlife. You might spot deer, bobcats, and coyotes. Mountain lions are also present, so it's important to be aware of your surroundings and follow safety guidelines for wildlife encounters.
Are there any cafes or places to eat near the preserve after a ride?
While there are no facilities directly within the preserve, the nearby towns of Los Gatos and San Jose offer a variety of cafes, restaurants, and accommodation options where you can refuel and relax after your gravel biking adventure.
Most popular routes in Sierra Azul Open Space Preserve
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