California’s Wine Country from Santa Rosa to Napa have four different USDA Planting Zones 9a, 9b, 10a, and 10b, as declared by the latest USDA update of 2023. Average annual winter temperatures here range from 20°F to 40°F (-6.7°C to 4.4°C).
The coldest zone here is USDA zone 9a (20°F to 25°F / -6.7°C to -3.9°C) which covers areas like Penngrove and Sebastopol. The warmest zone is USDA zone 10b (35°F to 40°F / 1.7°C to 4.4°C) found only in Sea Ranch along the coast.
Most wine country towns like Healdsburg, Petaluma, and Windsor fall within USDA zone 9b (25°F to 30°F / -3.9°C to -1.1°C), and coastal areas like Santa Rosa and Glen Ellen have milder USDA zone 10a (30°F to 35°F / -1.1°C to 1.7°C).
Many locations here lies in multiple USDA zones like Santa Rosa (9a-9b-10a), Sonoma County (9a-9b-10a-10b), and Guerneville (9a-9b-10a).
Locate your USDA planting zone of Sonoma Wine Country, CA, using the interactive map or the USDA hardiness zones table provided below.
Wine Country’s USDA Planting Zones Map
Select or type your Sonoma Wine Country, 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
Wine Country’s USDA Planting Zones Table
California’s Wine Country region has four USDA Planting Zones 9a, 9b, 10a, and 10b. The 20 USDA hardiness zone locations in Wine Country are Bodega Bay, Cazadero, Cloverdale, Cotati, Dillon Beach, Forestville, Geyserville, Glen Ellen, Guerneville, Healdsburg, Monte Rio, Occidental, Penngrove, Petaluma, Rohnert Park, Santa Rosa, Sea Ranch, Sebastopol, Sonoma County, and Windsor. The 20 USDA hardiness zone locations in Wine Country are listed below.
| Location | USDA Hardiness Zone |
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