Silicon Valley, California, from Palo Alto to San Jose spans two different USDA Planting Zones 9b and 10a, as declared by USDA update in 2023. Winter temperatures here range from 25°F to 35°F (-3.9°C to 1.7°C).
The coldest zone here is USDA zone 9b (25°F to 30°F / -3.9°C to -1.1°C) which covers areas like Campbell, Los Altos, Monte Sereno, and Mountain View Contra Costa. The warmest zone is USDA zone 10a (30°F to 35°F / -1.1°C to 1.7°C) which includes Hillsborough and coastal-influenced areas.
Most cities like Palo Alto, San Jose, Santa Clara, and Sunnyvale experience both USDA zones 9b and 10a with winter lows ranging from 25°F to 35°F.
Smaller cities like Campbell and Monte Sereno fall purely in USDA zone 9b, and Hillsborough is exclusively in the warmer zone 10a.
Locate USDA planting zone of your city or town on California‘s Silicon Valley using the interactive map or the USDA hardiness zones table provided below.
USDA Zones Map of Silicon Valley, CA
Select or type your Silicon Valley, California, location in selection box below, to find its USDA Growing zone.
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USDA Planting Zone
This zone’s data comes from the United States Department of Agriculture (USDA), with the most recent zone updates released in 2023
Planting Zones
Planting Zones
Planting Zones Table of Silicon Valley, CA
Silicon Valley region in California has two USDA Planting Zones from 9b to 10a. The 20 USDA hardiness zone locations in Silicon Valley are Campbell, Cupertino, East Palo Alto, Emerald Lake Hills, Hillsborough, Los Altos, Los Altos Hills, Los Gatos, Milpitas, Monte Sereno, Mountain View Contra Costa, Mountain View Santa Clara, Newark, Palo Alto, San Jose, Santa Clara, Saratoga, Stanford, Sunnyvale, and Woodside. The 20 USDA hardiness zone locations in Silicon Valley are listed below.
| Location | USDA Hardiness Zone |
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