King City, CA 93928 Frost Dates
Frost dates for King City, CA, ZIP 93928
The last spring frost here typically falls around 02/23, about 179 days from today. The first fall frost typically arrives around 11/22, about 271 frost-free days later.
The USDA Plant Hardiness Zone Map puts King City in Zone 9a (20 to 25°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 9a around King City has about 12 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 02/23 isn't a guarantee
02/23 is the middle of 30 years of NOAA records, not a promise. Plant by 01/19 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 King City compares
King City's growing season runs about 271 days, ranking 5,424 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 1,880 of 2,555.
Learn more
local microclimates explains what one yard in King City can differ from the 93928 normal, and zone vs. frost date explains why Zone 9a and King City's frost date answer different questions.