San Jose, CA 95111 Frost Dates
San Jose, CA: when does the frost end?
The last spring frost here typically falls around 01/02, about 127 days from today. Fall's first freeze usually shows up around 12/25, roughly 362 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts San Jose in Zone 9b (25 to 30°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 17 weeks until San Jose's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 01/02 isn't a guarantee
01/02 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 01/23 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/14 and only about 1 year in 10 sees frost after that.
San Jose against the rest of the dataset
At roughly 362 frost-free days, San Jose places 2,049 of 40,283 ZIP codes in this dataset. Within CA, it ranks 935 of 2,555.
Learn more
Before leaning on 95111's figures: local microclimates explains what one yard in San Jose can differ from the 95111 normal, while zone vs. frost date explains why Zone 9b and San Jose's frost date answer different questions.