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Frost dates and growing zones in California

10 town pages so far. Zones from the 2023 USDA Plant Hardiness Zone Map, frost dates from NOAA 1991-2020 normals at the nearest weather station.

Towns covered so far in California fall in USDA zones 8b, 9a, 9b. Median dates mean frost comes later (spring) or earlier (fall) in half of years.

Towns

TownZoneMedian last frostMedian first frost
Elk Grove9bFeb 2Dec 2
Santa Rosa9bFeb 25Dec 1
Lancaster8bApr 3Nov 1
Concord9bMar 8Dec 22
Vacaville9bFeb 18Nov 28
Napa9bFeb 12Dec 4
Apple Valley8bMar 18Nov 11
Dublin9bFeb 15Dec 2
Davis9bFeb 10Dec 1
Grass Valley9aApr 10Nov 13

Zones in California