California frost dates by county and ZIP code

Granite cliffs and Half Dome above forested Yosemite Valley from Glacier Point, California — Photo: Tuxyso, CC BY-SA 3.0, via Wikimedia Commons

Across 1,803 California ZIP codes the average last spring frost runs Dec 29 (prior Dec) to Jun 14 and the average first fall frost Sep 10 to Feb 1 (next year) (50% odds, 32°F, NOAA 1991–2020 normals), with USDA hardiness zones. Download the table as CSV.

Plants for California from university programs

UC Agriculture and Natural Resources (University of California): home, yard and garden help

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