4.6
(208)
3,377
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55
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Dog friendly hiking trails in Sierra Azul Open Space Preserve traverse a diverse landscape within the Santa Cruz Mountains, spanning over 19,000 acres. The preserve features serpentine grasslands, rocky chaparral, dense bay tree stands, and shaded oak woodlands. Hikers encounter deep ravines and riparian corridors, with elevations reaching up to 3,486 feet at Mount Umunhum. The terrain offers a range of experiences from gentle ascents to challenging climbs, providing varied natural features for exploration.
Last updated: May 14, 2026
1
hikers
55.0km
16:32
1,670m
1,930m
Hike the challenging 34.2-mile Quicksilver 50K in Almaden Quicksilver County Park, featuring 5493 feet of elevation gain and diverse scenery
1
hikers
13.6km
04:07
450m
450m
Hike the moderate 8.5-mile Bay Area Ridge Trail: Almaden Quicksilver Park Loop for historic mining sites and panoramic Bay Area views.

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14
hikers
Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.
9
hikers
Easy hike. Great for any fitness level. Easily-accessible paths. Suitable for all skill levels.
10
hikers
Easy hike. Great for any fitness level. Easily-accessible paths. Suitable for all skill levels.
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You'll want to have your maps downloaded and your route planned once you reach this point. Two trails diverge here and short distance down the Castillero Trail you'll have the option to take up the English Camp Trail.
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Randol Trail runs parallel to Mine Hill Trail but is situated at a lower elevation on the San Francisco Bay Area side. Originally built as a mining road to access the historic Day Tunnel, the trail is a lovely wide, well-maintained path winding through grassy fields, brush, and beautiful wooded landscapes with nice San Francisco South Bay Area views.
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This junction offers many options for continuing to explore the park. From here, you can stay to the left on Mine Hill Trail to extend your hike and connect with other trails to the west. Explore the small April Trail loop northwest or east onto the Great Eastern Trail to connect with Randol and several trails on the east side of the grounds.
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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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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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Nestled near Los Gatos, St. Joseph's Hill Open Space Preserve offers picturesque vistas of the town. Spanning 273 acres atop a 1,250-foot hill, this reserve boasts classic wilderness charm. Popular among cyclists, hikers, equestrians, and dog enthusiasts, it's a bustling hub for outdoor activity. Explore its diverse array of trails and discover why it's such a beloved destination.
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This marks the beginning of the Woods Trail, that heads west into Sierra Azul hills. A couple of long MTB loops can be started from here.
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Sierra Azul Open Space Preserve offers a wide selection of dog-friendly trails. You'll find over 50 routes suitable for hiking with your canine companion, ranging from easy strolls to more challenging ascents.
Dogs are generally welcome on trails in Sierra Azul Open Space Preserve, but they must be kept on a leash at all times. Always remember to pack out any waste and ensure your dog is well-behaved around other hikers and wildlife. Check local signage for any specific trail restrictions.
Yes, there are several easy dog-friendly options. For a gentle walk, consider the James J. Lenihan Dam β Lexington Reservoir Overlook loop, which offers pleasant views over the reservoir. Another accessible choice is the Woods Trail Trailhead β Mount Umunhum Road loop, providing a gradual ascent through wooded areas.
Absolutely. Loop trails are a great way to explore without retracing your steps. The English Camp β Castillero Trail loop is a moderate option that takes you through varied terrain. For a longer, more challenging loop, the Bay Area Ridge Trail: Almaden Quicksilver Park Loop offers extensive views.
The preserve boasts diverse terrain, from serpentine grasslands and rocky chaparral to dense oak woodlands and riparian corridors. Many trails feature gradual ascents and descents, with some sections offering more rugged paths. You and your dog will encounter varied landscapes, including shaded areas and open hillsides with panoramic views.
Many trails lead to stunning viewpoints. While Mount Umunhum itself has specific access rules, you can enjoy expansive views from trails like the Bald Mountain Trail, which overlooks the Almaden Valley. The preserve also features deep ravines and riparian corridors, offering natural beauty. The Sierra Azul Open Space itself is a highlight for its natural environment.
Spring and fall are ideal for hiking with dogs in Sierra Azul Open Space Preserve. In spring, you'll enjoy vibrant wildflowers like poppies and lupine, and cooler temperatures. Fall offers pleasant weather and beautiful foliage. Summer can be hot, so early morning or late afternoon hikes are recommended, and always bring plenty of water for both you and your dog.
Parking is available at various trailheads throughout the preserve. Popular access points include the Kennedy Road Sierra Azul Trailhead and parking areas near Almaden Quicksilver County Park, which connect to many dog-friendly routes. Always check specific trailhead information for parking availability and regulations.
Always bring enough water for both yourself and your dog, especially on longer routes or warmer days. Pack waste bags and be prepared to pack out all waste. Consider your dog's fitness level and paw sensitivity to the terrain. Tick prevention is also advisable, particularly during warmer months.
The trails in Sierra Azul Open Space Preserve are highly rated by the komoot community, with an average score of 4.56 stars. Reviewers often praise the diverse landscapes, well-maintained paths, and the opportunity to enjoy nature with their dogs, highlighting the panoramic views and peaceful atmosphere.
Yes, for experienced hikers and their well-conditioned dogs, the preserve offers more strenuous options. The Quicksilver 50K route, while very long, showcases the ruggedness and elevation changes of the area. Shorter but challenging sections can be found along trails leading towards Mount El Sombroso, offering significant climbs and rewarding views.


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