Fillmore, CA 93040 Frost Dates
Frost dates for Fillmore, CA, ZIP 93040
Typically, the last spring freeze lands around 01/08, roughly 133 days out. The first fall frost typically arrives around 01/01, about 365 frost-free days later.
The USDA Plant Hardiness Zone Map puts Fillmore in Zone 8b (15 to 20°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 8b around Fillmore has about 18 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
How much risk comes with planting early here
01/08 is the middle of 30 years of NOAA records, not a promise. Plant by 03/10 and you're betting against frost in roughly 9 years out of 10. 12/08 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Fillmore compares
At roughly 365 frost-free days, Fillmore places 1,508 of 40,283 ZIP codes in this dataset. Within CA, it ranks 777 of 2,555.
Learn more
the frost range explains how to read the range around Fillmore's dates instead of trusting one, and local microclimates explains what one yard in Fillmore can differ from the 93040 normal.