Williams, CA 95912 Frost Dates
Frost dates for Williams, CA, ZIP 95912
Around 02/14 is the usual last spring frost, about 170 days away. The first fall frost typically arrives around 12/01, about 293 frost-free days later.
Williams sits in USDA Zone 9b (25 to 30°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
Zone 9b around Williams has about 14 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.
Why 02/14 isn't a guarantee
02/14 is the middle of 30 years of NOAA records, not a promise. Plant by 01/02 and you're betting against frost in roughly 9 years out of 10. 03/31 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Williams compares
At roughly 293 frost-free days, Williams places 4,290 of 40,283 ZIP codes in this dataset. Within CA, it ranks 1,666 of 2,555.
Learn more
the frost range explains how to read the range around Williams's dates instead of trusting one, and local microclimates explains what one yard in Williams can differ from the 95912 normal.