Atwater, CA 95343 Frost Dates
When can you plant in Atwater, CA?
Typically, the last spring freeze lands around 02/26, roughly 182 days out. The first fall frost typically arrives around 11/25, about 273 frost-free days later.
Zone 9a (20 to 25°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Atwater, not a forecast for this year.
What to do before the first frost
About 13 weeks of growing season left in Atwater before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
How much risk comes with planting early here
02/26 is the middle of 30 years of NOAA records, not a promise. Plant by 01/20 and you're betting against frost in roughly 9 years out of 10. 04/01 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Atwater compares
At roughly 273 frost-free days, Atwater places 5,189 of 40,283 ZIP codes in this dataset. Within CA, it ranks 1,828 of 2,555.
Learn more
local microclimates covers what one yard in Atwater can differ from the 95343 normal. zone vs. frost date covers why Zone 9a and Atwater's frost date answer different questions.