Atascadero, CA 93465 Frost Dates
When can you plant in Atascadero, CA?
The last spring frost here typically falls around 03/15, about 199 days from today. The first fall frost typically arrives around 11/10, about 238 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 Atascadero, not a forecast for this year.
What to do before the first frost
About 11 weeks of growing season left in Atascadero 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
03/15 is the middle of 30 years of NOAA records, not a promise. Plant by 02/12 and you're betting against frost in roughly 9 years out of 10. 04/13 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Atascadero compares
About 238 days separate Atascadero's last and first frost, putting it 8,938 of 40,283 ZIP codes nationally. Within CA, it ranks 2,126 of 2,555.
Learn more
local microclimates covers what one yard in Atascadero can differ from the 93465 normal. zone vs. frost date covers why Zone 9a and Atascadero's frost date answer different questions.