Siskiyou County, California
Local growing conditions for Siskiyou County: the USDA hardiness zones found here, frost dates, and live weather for communities across the county. Based on 21 ZIP codes in our data.
Hardiness zones in Siskiyou County
Siskiyou County spans these USDA plant hardiness zones (by number of ZIP codes):
Local weather & frost dates
Open any community in Siskiyou County for its live forecast, frost dates, and planting calendar:
Mount Shasta 96067
Happy Camp 95568
Etna 96014
Dorris 96023
Castella 96025
Etna 96027
Coffee Creek 96031
Greenview 96032
Gazelle 96034
Greenview 96037
Grenada 96038
Hornbrook 96044
Yreka 96050
McCloud 96057
Mount Hebron 96058
Montague 96064
Fort Jones 96085
Happy Camp 96086
Lake Shastina 96094
Yreka 96097
More for California
- Agriculture in California
- Frost dates across California
- USDA hardiness zones explained
- Planting calendar by ZIP code
County growing conditions are compiled from our ZIP-code database, USDA hardiness-zone data, and NOAA climate normals. Conditions vary within a county by elevation and local microclimate. Page updated Aug 4, 2026.