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Routes
Road cycling routes
United States
California
San Mateo County

Thornewood Open Space Preserve

The best road cycling routes in Thornewood Open Space Preserve

4.6

(53)

3,385

riders

52

rides

Road cycling in Thornewood Open Space Preserve's surrounding area offers diverse terrain within the Santa Cruz Mountains. The region is characterized by forested hills with a mix of redwood, Douglas fir, oak, and madrone woodlands. Cyclists can expect routes with significant elevation gain, providing panoramic views of the southern San Francisco Bay and the Diablo Range. The area features both shaded, curvy descents and challenging climbs.

Best road cycling routes in Thornewood Open Space Preserve

  • The most popular road cyclingโ€ฆ

Last updated: May 13, 2026

5.0

(1)

62

riders

#1.

Junipero Serra Boulevard โ€“ Portola Valley loop from Portola Valley

28.5km

01:18

310m

310m

Moderate road ride. Good fitness required. Mostly well-paved surfaces and easy to ride.

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Moderate

Moderate road ride. Good fitness required. Mostly well-paved surfaces and easy to ride.

Moderate
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Moderate road ride. Great for any fitness level. Some segments of this route may be unpaved and difficult to ride.

Moderate

14

riders

Easy road ride. Great for any fitness level. Mostly well-paved surfaces and easy to ride.

Easy

Moderate road ride. Good fitness required. Mostly well-paved surfaces and easy to ride.

Moderate
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Tips from the Community

Will
June 20, 2025, Alpine Road

The Northern part of Alpine Road is a paved and curvy descent through wooded areas and runs parallel to Coal Mine Ridge Preserve, eventually connecting with the trailhead there.

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This mostly paved bike trail alongside Alpine Road is great for bike commuting โ€” just don't run over any slower trail users! The trail runs all the way from Portola Valley to Stanford, offering some nice shade along the way. The brief moments of unpaved trail are near the Portola Valley end.

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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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good

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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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Tim
November 4, 2024, Junipero Serra Boulevard

While this is an expressway, there is good room for safe riding and most of the day it isn't too heavily trafficked which makes for a great, rolling straight run

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Old La Honda Rd downhill video: https://youtu.be/icnBpBZQ8gE?si=xYovaH-Nr8llwLEM

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Diana
December 15, 2023, Arastradero Lake

Arastradero Lake is a quiet pond in the hills of the Arastradero Preserve. The lake is surrounded by oak trees and can get pretty dry in summer.

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Frequently Asked Questions

Can I road cycle directly within Thornewood Open Space Preserve?

No, road cycling is not permitted on the internal trails of Thornewood Open Space Preserve itself. However, the surrounding roads in the Santa Cruz Mountains offer excellent opportunities for road cycling, with routes often passing near or by the preserve.

What kind of terrain can I expect on road cycling routes near Thornewood Open Space Preserve?

The region features diverse terrain, from forested hills with a mix of redwood, Douglas fir, oak, and madrone woodlands to routes with significant elevation gain. You'll find both shaded, curvy descents and challenging climbs, often providing panoramic views of the southern San Francisco Bay and the Diablo Range.

Are there routes suitable for beginners or those looking for an easier ride?

Yes, while many routes offer significant climbs, there are options for easier rides with mostly well-paved surfaces. For example, the Manzanita Way โ€“ Tree Tunnel on Portola Road loop from Portola Valley is an easy 14.5-mile path offering a scenic ride through varied landscapes.

Where can I find challenging road cycling routes in the area?

For a more challenging experience, routes incorporating roads like Old La Honda Road are popular. The Old La Honda Road โ€“ Manzanita Way loop from Portola Valley is a moderate 20.15-mile route with significant elevation gain, often completed in under two hours. Another option is the Tree Tunnel on Portola Road โ€“ Lower Kings Mountain Road loop from Portola Valley, which leads through forested hills with notable climbs.

What are some scenic viewpoints or natural features I might encounter on a road bike ride?

Cyclists can enjoy glimpses of the southern San Francisco Bay, Palo Alto, and Stanford University's Hoover Tower from various points. The region is also known for its forested hills, including redwood and Douglas fir woodlands, and the tranquil Schilling Lake within the preserve (though not directly accessible by bike, its presence adds to the natural beauty of the area).

Is there parking available for road cyclists near the routes?

Many popular road cycling routes in the area, such as those incorporating Old La Honda Road or Alpine Road, often start from towns like Portola Valley or Woodside, where public parking may be available. It's advisable to check specific starting points for parking options.

What is the best time of year for road cycling in this region?

The region offers good cycling conditions for much of the year. Wildflowers can be seen until summer, and in autumn, black oaks and big-leaf maples provide vibrant scenery. Always check local weather forecasts, especially for potential fog or rain, as conditions can vary.

Are there any places to stop for refreshments or a break during a ride?

Yes, the nearby historic town of Woodside is a charming and convenient spot for cyclists to refuel. It features quaint shops, a market, a bakery, and outdoor seating, making it an ideal break point.

What do other road cyclists say about the routes near Thornewood Open Space Preserve?

The road cycling routes in this area are highly rated by the komoot community, with an average score of 4.6 stars from over 70 reviews. Over 5,000 road cyclists have used komoot to explore the varied terrain, often praising the challenging climbs, scenic descents, and picturesque natural beauty.

Are there any loop routes available for road cycling?

Yes, many of the popular routes are designed as loops. For instance, the Old La Honda Road โ€“ Old La Honda Road loop from Portola Valley is a moderate 9.4-mile option, and the Old La Honda Road loop from Woodside is another popular moderate loop covering about 12.3 miles.

How many road cycling routes are available in the Thornewood Open Space Preserve surrounding area?

There are over 50 road cycling routes available in the surrounding area of Thornewood Open Space Preserve, offering a wide range of distances and difficulties for cyclists to explore.

Most popular routes in Thornewood Open Space Preserve

Hiking in Thornewood Open Space Preserve

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