Williams, CA 95987 Frost Dates
When can you plant in Williams, CA?
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.
Zone 9b (25 to 30°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 Williams, not a forecast for this year.
What to do before the first frost
About 14 weeks of growing season left in Williams before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Williams's last frost
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 4,293 of 40,283 ZIP codes in this dataset. Within CA, it ranks 1,669 of 2,555.
Learn more
local microclimates covers what one yard in Williams can differ from the 95987 normal. zone vs. frost date covers why Zone 9b and Williams's frost date answer different questions.