San Joaquin, CA 93608 Frost Dates
When can you plant in San Joaquin, CA?
Around 02/27 is the usual last spring frost, about 183 days away. The first fall frost typically arrives around 11/26, about 271 frost-free days later.
The USDA Plant Hardiness Zone Map puts San Joaquin in Zone 9b (25 to 30°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
About 13 weeks of growing season left in San Joaquin before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around San Joaquin's last frost
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
About 271 days separate San Joaquin's last and first frost, putting it 5,434 of 40,283 ZIP codes nationally. Within CA, it ranks 1,888 of 2,555.
Learn more
zone vs. frost date covers why Zone 9b and San Joaquin's frost date answer different questions. the frost range covers how to read the range around San Joaquin's dates instead of trusting one.