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United States
California
San Mateo County
Portola Valley

Black Mountain – Arastradero Lake loop from Portola Valley

Routes
United States
California
San Mateo County
Portola Valley

Black Mountain – Arastradero Lake loop from Portola Valley

Hard

4.5

(3571)

12,290

riders

Black Mountain – Arastradero Lake loop from Portola Valley

03:59

48.2km

1,300m

Gravel riding

Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels. The starting point of the route is right next to a parking lot.

Last updated: March 17, 2026

Tips

Includes a segment in which cycling is not permitted

After 27.7 km for 75 m

Waypoints

A

Start point

Parking

Get Directions

1

18.8 km

Borel Hill

Highlight • Summit

Spectacular 360° surround views from the top of the hill (2513 feet / 766 meters).

Tip by

2

24.8 km

Bella Vista Trail

Highlight (Segment) • Trail

Bella Vista Trail is another good singletrack trail. It will subject you to a serious but manageable climb, where the average slope barely ever exceeds 10% grade. This trail has …

Tip by

3

26.9 km

Indian Creek Trail

Highlight (Segment) • Trail

Indian Creek Trail is a short fire road, which leads you to Monte Bello Road. It's a pretty easy ride.

Tip by

4

27.6 km

Black Mountain

Highlight • Summit

Highest point with a view across Palo Alto, Stanford, the Silicon Valley, and across the Bay. Note the Kaiser Permanente limestone quarry right below, ringed on the south by Permanente …

Tip by

5

27.8 km

Monte Bello Road

Highlight (Segment) • Summit

Montebello Road quickly leads you to the (fairly flat) peak of Black Mountain.

Tip by

6

37.9 km

Boronda Lake

Highlight • Lake

Part of the 1,400-acre Foothills Nature Preserve, where animals like to see deer and coyotes are common, though bobcat sighting are more rare.

Tip by

41.4 km

Enid Pearson-Arastradero Preserve

Nature Reserve

8

42.1 km

Arastradero Lake

Highlight • Lake

Arastradero Lake is nestled in the hills of the Enid Pearson-Arastradero Preserve. The lake is surrounded by oak trees and can get quite dry in the summer.

Tip by

B

48.2 km

End point

Parking

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Way Types & Surfaces

Way Types

17.8 km

17.5 km

6.86 km

3.19 km

2.66 km

175 m

Surfaces

23.8 km

20.3 km

2.73 km

1.05 km

341 m

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Elevation

Elevation

Nothing selected – click and drag below to see the stats for a specific part of the route.

Highest point (850 m)

Lowest point (120 m)

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Weather

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Today

Tuesday 19 May

29°C

13°C

0 %

Additional weather tips

Max wind speed: 11.0 km/h

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Our route recommendations are based on thousands of hikes, rides, and runs completed by other people on komoot.

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Moderate

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04:09h

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