Santa Rosa, California spans across three USDA Hardiness Zones- 9a, 9b, and 10a, featuring average annual minimum temperatures ranging from 20°F to 35°F (-6.7°C to 1.7°C), according to the 2023 USDA update. The 3 Planting Zones in Santa Rosa are listed below.
- Zone 9a (20°F to 25°F / -6.7°C to -3.9°C): Zone 9a dominates central and western Santa Rosa, including Downtown Santa Rosa, Coffey Park, Carrillo Adobe area, and Coddingtown. It extends to Cherry Street Historic District, Mendocino Avenue corridor, and Southwest Santa Rosa, where winter temperatures occasionally drop to 20°F (-6.7°C).
- Zone 9b (25°F to 30°F / -3.9°C to -1.1°C): Zone 9b covers eastern neighborhoods like Rincon Valley, Spring Lake, and Bennett Valley Heights. Notable areas include Annadel Heights, Chanate Road area, and McDonald Mansion Historic District, where frosts are milder and shorter-lived than in Zone 9a.
- Zone 10a (30°F to 35°F / -1.1°C to 1.7°C): Zone 10a occurs in Santa Rosa’s warmest microclimates, primarily in Fountain Grove, Fairway Isle at Fountaingrove, and Fountaingrove East. These elevated or sheltered areas rarely see temperatures below 30°F (-1.1°C), creating ideal conditions for frost-sensitive plants.
You can find your Santa Rosa, California, USDA zone using our three tools given below, Zipcode to planting zone search tool, interactive map or by planting zone table.
Santa Rosa Planting Zones by ZipCode
Enter 5 digit Santa Rosa zipcode to fins its USDA Planting zone.
Santa Rosa Planting Zones Map
Please Select or type your Santa Rosa location in the selection box below to find its USDA Growing zone.
City Name
Santa Rosa Area Planting Zone
Planting Zones
Planting Zones
Santa Rosa Planting Zones Table
The table below lists all the Santa Rosa locations, alongwith their USDA Hardiness zones.
| Santa Rosa Location | Planting Zone |
|---|---|
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Santa Rosa Growing Zones
Santa Rosa, California spans three USDA Hardiness Zones- 9a, 9b, and 10a.
Zone 9a
The majority of the city falls within Zone 9a (20°F to 25°F / -6.7°C to -3.9°C), including neighborhoods like Downtown Santa Rosa, Coffey Park, and Roseland.
This zone supports cool-season vegetables like Kale (Brassica oleracea) and Broccoli (Brassica oleracea var. italica) and frost-tolerant ornamentals like Lavender (Lavandula spp.) and Russian Sage (Perovskia atriplicifolia).
Zone 9b
Eastern and northeastern Santa Rosa areas typically fall into Zone 9b (25°F to 30°F / -3.9°C to -1.1°C), including Rincon Valley, Spring Lake, and Bennett Valley.
Mediterranean vegetables like Tomatoes (Solanum lycopersicum) and Peppers (Capsicum annuum) thrive here, alongside drought-tolerant plants like Rosemary (Rosmarinus officinalis) and Bougainvillea (Bougainvillea spp.). Fruit trees like Olive (Olea europaea) and Fig (Ficus carica) also grows here.
Zone 10a
Zone 10a occurs in Santa Rosa’s warmest microclimates, primarily in Fountain Grove and Fairway Isle. Heat-loving vegetables like Okra (Abelmoschus esculentus) and Eggplant (Solanum melongena) flourish here, alongside tropical plants like Hibiscus (Hibiscus rosa-sinensis) and Bird of Paradise (Strelitzia reginae). Fruit trees like Citrus (Citrus spp.) and Avocado (Persea americana) also grows in this zone.