5.0
(8)
103
riders
11
rides
Gravel biking in Calero County Park offers an extensive trail system across approximately 4,471 acres in the eastern foothills of the Santa Cruz Mountains. The park features rolling grassland hills, California Oak woodlands, and chaparral, providing varied ecosystems. Many trails consist of fine gray gravel or smooth dirt, suitable for gravel bikes, alongside the prominent Calero Reservoir. Ridges within the park offer expansive views of southern Santa Clara County and the surrounding mountain ranges.
Last updated: April 30, 2026
5.0
(1)
8
riders
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
5
riders
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.

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9
riders
38.0km
03:15
1,080m
1,080m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
3
riders
43.9km
03:58
1,140m
1,140m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
5.0
(1)
9
riders
52.5km
03:53
820m
820m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
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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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Fossils of marine creatures like clams and oysters can be found in the sandstone of the peaks, hinting at a time when the area was submerged beneath the ocean. The hills around Bald Peaks are home to unique rock formations like chert and rhyolite, attracting hobbyists searching for colorful and interesting specimens.
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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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Bald Peak provides great views of Santa Clara Valley, the Diablo Range, and the Santa Cruz Mountains. Hikers and mountain bikers can access the peak via trails like Hidden Springs and Coyote Peak, which offer moderate to steep climbs. Early mornings or late afternoons are best for enjoying cooler temperatures in hot summer months. The trails are well-maintained and scenic.
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Located right by the parking area you can find some additional info before heading out on your ride.
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Nice gravel trail that winds its way through the park. Some sections follow long the water giving you some great views.
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Calero County Park offers a diverse gravel biking experience. You'll find a mix of wide-open trails, some with gradual gravel inclines, and others that present more technical challenges. Many segments feature a fine, gray gravel layer, while others are smooth dirt, making them ideal for gravel bikes. The park is characterized by rolling grassland hills, California Oak woodlands, and chaparral, providing varied ecosystems and scenic views.
While many routes in Calero County Park are rated as difficult, the park does offer trails suitable for various skill levels. For instance, the Lisa Killough Trail provides a gentle gravel incline and is part of a 9.5-mile loop that can be suitable for those looking for a less strenuous ride. Always check the specific route details for elevation gain and terrain to ensure it matches your family's ability.
The park is rich in natural beauty. You can expect to see expansive grasslands, California Oak woodlands, and chaparral. The prominent Calero Reservoir is a frequent companion to many trails, offering scenic views. From the ridgelines, you'll find breathtaking vistas of southern Santa Clara County, the Santa Cruz Mountain Range, and the Diablo Range. A popular spot like Lisa's Lookout provides an excellent vantage point of the surrounding Santa Cruz Mountains.
Calero County Park features an extensive trail system with over a dozen gravel biking routes documented on komoot. These routes vary in length and difficulty, offering options for different preferences and skill levels.
The park is beautiful year-round, but spring (March, April, and May) is particularly stunning due to spectacular displays of wildflowers, including California poppies, lupins, and buttercups, across the rolling grassland hills. Always check local weather conditions before heading out, especially after rain, as trail conditions can change.
The routes in Calero County Park are highly rated by the komoot community, with an average score of 4.3 stars from over 4 reviews. Reviewers often praise the varied terrain, the scenic views of the Calero Reservoir, and the opportunities for challenging rides with significant elevation gain through grasslands and oak groves.
Yes, Calero County Park offers several challenging routes for experienced gravel bikers. For example, the Mine Hill Trailhead – Lisa Killough Trail loop from Almaden Quicksilver County Park is a difficult 25.4-mile route with significant elevation gain. Another option is the Mine Hill Trailhead – Mount Umunhum Road loop from Almaden Valley, which spans over 27 miles and features substantial climbing.
Calero County Park has designated parking areas. Specific trailheads often have associated parking. It's advisable to check the park's official website or the komoot tour details for the most accurate and up-to-date parking information for your chosen starting point.
Generally, no specific permits are required for gravel biking on the designated trails within Calero County Park. However, it's always a good practice to check the official Santa Clara County Parks website for any updated regulations or special event requirements before your visit.
Yes, many of the gravel biking routes in Calero County Park are designed as loops, allowing you to start and end at the same point. Examples include the Lisa Killough Trail – Calero Reservoir loop from Parkview and the Lisa Killough Trail – Lisa Killough Trail Viewpoint loop from Rancho San Vicente Entrance, offering convenient circular rides.
Calero County Park is home to diverse wildlife. You might spot red-tailed hawks, ground squirrels, burrowing owls, coyotes, and deer. Near the reservoir, various bird species such as ducks, geese, cormorants, and even bald eagles can be observed.
While Calero County Park itself focuses on natural recreation, its proximity to urban areas means you can find amenities like cafes, restaurants, and accommodation in nearby towns and communities. It's recommended to plan your refreshment stops before or after your ride.


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