San Jose, CA 95135 Frost Dates
95135, near San Jose, CA: the frost window
Around 05/03 is the usual last spring frost, about 248 days away. Fall's first freeze usually shows up around 11/18, roughly 197 days after the last spring frost.
Zone 9b (25 to 30°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for San Jose, not a forecast for this year.
Stretching the season past the first frost
San Jose's growing season runs out in roughly 12 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 05/03 isn't a guarantee
05/03 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/07 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/05 and only about 1 year in 10 sees frost after that.
San Jose against the rest of the dataset
At roughly 197 frost-free days, San Jose places 18,569 of 40,283 ZIP codes in this dataset. Within CA, it ranks 2,244 of 2,555.
Learn more
Two guides worth reading on 95135: local microclimates, on what one yard in San Jose can differ from the 95135 normal, and zone vs. frost date, on why Zone 9b and San Jose's frost date answer different questions.