San Joaquin, CA 93668 Frost Dates
Frost dates for San Joaquin, CA, ZIP 93668
The last spring frost here typically falls around 02/27, about 183 days from today. The first fall frost typically arrives around 11/26, about 271 frost-free days later.
San Joaquin sits in USDA Zone 9a (20 to 25°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 9a around San Joaquin has about 13 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
02/27 is the middle of 30 years of NOAA records, not a promise. Plant by 01/21 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 San Joaquin compares
San Joaquin's growing season runs about 271 days, ranking 5,437 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 1,891 of 2,555.
Learn more
the frost range explains how to read the range around San Joaquin's dates instead of trusting one, and local microclimates explains what one yard in San Joaquin can differ from the 93668 normal.