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Routes
Gravel rides
United States
California
San Mateo County

Thornewood Open Space Preserve (Closed Area)

Routes
Gravel rides
United States
California
San Mateo County

Thornewood Open Space Preserve (Closed Area)

The best gravel rides in Thornewood Open Space Preserve (Closed Area)

5.0

(1)

44

riders

11

rides

Gravel biking in Thornewood Open Space Preserve (Closed Area) is not permitted, as bicycling is explicitly prohibited within the preserve. The area, managed by the Midpeninsula Regional Open Space District, is a 167-acre regional park in the Santa Cruz Mountains. It features forested hills with a mix of second-growth redwood, Douglas fir, oak, and madrone woodlands. Notable natural features include Schilling Lake, surrounded by redwoods, and diverse plant life.

Best gravel bike trails in Thornewood Open Space Preserve (Closed Area)

โ€ฆ

Last updated: May 17, 2026

4

riders

#1.

Black Mountain โ€“ Arastradero Lake loop from Portola Valley

48.2km

03:59

1,300m

1,300m

Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.

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Hard

Moderate gravel ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.

Moderate
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Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.

Hard

Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.

Hard

Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.

Hard
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Popular around Thornewood Open Space Preserve (Closed Area)

Hiking in Thornewood Open Space Preserve (Closed Area)

MTB Trails in Thornewood Open Space Preserve (Closed Area)

Running Trails in Thornewood Open Space Preserve (Closed Area)

Cycling in Thornewood Open Space Preserve (Closed Area)

Road Cycling Routes in Thornewood Open Space Preserve (Closed Area)

Tips from the Community

maniboyflex
June 20, 2025, Alice's Restaurant at La Honda and Skyline Junction

Aliseโ€™s Restaurant is a popular spot for both cyclists and motorcyclists. The food is good, the staff is known for being friendly, and the place has a laid-back, welcoming vibeโ€”perfect for a post-ride meal or coffee break.

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Enid Pearson-Arastradero Preserve offers rolling grasslands mixed with oak and evergreen trees. The trail system starts on pavement and transitions to packed dirt and gravelโ€”great for bikes with wider tires or a solid gravel setup. Keep an eye out for deer, coyotes, and even bobcats, and take a moment to pause at one of the benches or by Arastradero Lake to enjoy the open views.

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Nitram X2
March 16, 2025, Borel Hill

Borel Hill is my favorite place to watch spring flowers. The western slope near ancient oaks (5-10min west of Borel Hill) are covered with orange California Poppies and purple flowers starting in April. Borel Hill itself peaks around mid May and has a wide variety of flowers. The show lasts only a few weeks until end of May. The peak time and flower intensity varies from year to year, so come several times between April and May. There is small summit NW of Borel Hill and a narrow dirt trail leads you to a rock within 2 min. The rock is big enough for 2-3 to sit on. On a sunny day, the rock is nice warm even if the air is cold. Good views on the ocean and the Bay.

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Didnโ€™t OLR used to turn into Dirt before reaching Skyline? Is it all pavement now?? Scott

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Sue
December 31, 2024, Black Mountain

Black Mountain, situated on Monte Bello Ridge, is a popular destination for hikers and mountain bikers. With an elevation of 2,812 feet, it's easy to understand why. From the summit, the views of the Santa Cruz Mountains and Silicon Valley are breathtaking.

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Sue
December 31, 2024, Rossotti's Alpine Inn

This fantastic tavern, founded in 1852, is the second oldest in the state. It features a large, beer garden-style outdoor area with plenty of shade. An extensive beer and food menu makes it a perfect stop to enjoy a brew and some great food after a ride.

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From Elena Road, youโ€™ll be treated to breathtaking views of the bay and surrounding hills. The vantage point offers a peaceful scene of the landscape, showcasing the natural beauty of the Bay Area.

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Great place for a break in a beautiful, peaceful spot among the redwoods. The restaurant is popular with locals, motorcyclists, hikers, and cyclists, and is the perfect place for a cold drink after finishing the climb up.

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Frequently Asked Questions

Is gravel biking permitted within Thornewood Open Space Preserve?

No, gravel biking is explicitly prohibited within Thornewood Open Space Preserve. The preserve is managed by the Midpeninsula Regional Open Space District, and bicycling is not allowed on its trails. It is primarily designated for hiking and equestrian use.

What activities are allowed in Thornewood Open Space Preserve?

Thornewood Open Space Preserve is open to the public for hiking and equestrian activities. Visitors can enjoy its serene natural setting, diverse woodlands, and features like Schilling Lake. For more information about the preserve, you can visit its Wikipedia page.

Are there any gravel biking alternatives near Thornewood Open Space Preserve?

Yes, while biking is not allowed within the preserve itself, the surrounding area offers several excellent gravel biking routes. These routes often feature varied terrain, climbs, and forested areas, providing a similar natural experience. You can find options like the Black Mountain โ€“ Arastradero Lake loop from Portola Valley or the Old La Honda Road โ€“ Portola Road loop from Portola Valley.

How many gravel biking routes are available in the region surrounding Thornewood Open Space Preserve?

There are over 10 gravel biking routes available in the wider region around Thornewood Open Space Preserve. These routes cater to various skill levels, from moderate to difficult, and offer diverse landscapes.

What kind of terrain can I expect on gravel bike routes near Thornewood Open Space Preserve?

Gravel bike routes in the vicinity of Thornewood Open Space Preserve are characterized by rolling hills, varied terrain, and significant elevation changes. Many routes lead through beautiful forested areas with a mix of redwood, Douglas fir, oak, and madrone woodlands.

Are there challenging gravel bike routes nearby for experienced riders?

Absolutely. For experienced gravel bikers seeking a challenge, routes like the Black Mountain โ€“ Arastradero Lake loop from Portola Valley, which covers nearly 30 miles with significant elevation gain, or the Portola Road โ€“ Old La Honda Road loop from Portola Valley, a 40-mile journey, offer demanding rides.

Can I find moderate gravel bike routes in the area?

Yes, there are moderate options available. The Old La Honda Road โ€“ Portola Road loop from Portola Valley is a popular moderate route, spanning about 8.6 miles and featuring varied terrain and climbs suitable for those looking for a less strenuous ride.

What are some notable natural features I might encounter on nearby gravel routes or within the preserve (if hiking)?

While biking, you'll experience diverse woodlands. If you choose to hike within Thornewood Open Space Preserve, you can explore Schilling Lake, a tranquil body of water surrounded by redwoods, and meander through forests featuring madrone, black oak, and Douglas fir. Some areas also offer glimpses of the southern San Francisco Bay and the Diablo Range.

What do other gravel bikers say about the routes in this region?

The gravel biking routes in the region are highly regarded by the komoot community. Over 20 gravel bikers have explored these trails, often praising the varied terrain, challenging climbs, and the scenic beauty of the forested areas.

Are there any loop options for gravel biking near Thornewood Open Space Preserve?

Yes, many of the gravel biking routes in the area are designed as loops, offering a complete and immersive experience. Examples include the Old La Honda Road โ€“ West Old La Honda Road loop from Portola Valley and the Adobe Creek โ€“ Boronda Lake loop from Portola Valley.

Is 'Old La Honda Road' a common feature in nearby gravel biking routes?

Yes, 'Old La Honda Road' is a well-known and frequently incorporated segment in several popular gravel biking routes in the vicinity. It's often part of loops that offer varied terrain and scenic views, such as the Old La Honda Road โ€“ Portola Road loop from Portola Valley.

Most popular routes in Thornewood Open Space Preserve (Closed Area)

Hiking in Thornewood Open Space Preserve (Closed Area)

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