San Jose, CA 95116 Frost Dates
Frost dates for San Jose, CA, ZIP 95116
The last spring frost here typically falls around 01/02, about 127 days from today. The first fall frost typically arrives around 12/25, about 362 frost-free days later.
San Jose 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 San Jose has about 17 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
01/02 is the middle of 30 years of NOAA records, not a promise. Plant by 01/23 and you're betting against frost in roughly 9 years out of 10. 12/14 is the safer bet, historically only a 1-in-10 chance of frost that late.
How San Jose compares
About 362 days separate San Jose's last and first frost, putting it 2,050 of 40,283 ZIP codes nationally. Within CA, it ranks 936 of 2,555.
Learn more
zone vs. frost date explains why Zone 9b and San Jose's frost date answer different questions, and the frost range explains how to read the range around San Jose's dates instead of trusting one.