San Jose, CA 95148 Frost Dates
95148, near San Jose, CA: the frost window
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.
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.
Stretching the season past the first frost
San Jose's growing season runs out in roughly 17 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
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 2,055 of 40,283 ZIP codes in this dataset. Within CA, it ranks 941 of 2,555.
Learn more
Two guides worth reading on 95148: zone vs. frost date, on why Zone 9b and San Jose's frost date answer different questions, and the frost range, on how to read the range around San Jose's dates instead of trusting one.