Hollister, CA 95023 Frost Dates
95023, near Hollister, CA: the frost window
Around 02/19 is the usual last spring frost, about 175 days away. Fall's first freeze usually shows up around 12/01, roughly 287 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Hollister 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
Hollister's growing season runs out in roughly 14 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 02/19 isn't a guarantee
02/19 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 01/10 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 03/28 and only about 1 year in 10 sees frost after that.
Hollister against the rest of the dataset
At roughly 287 frost-free days, Hollister places 4,580 of 40,283 ZIP codes in this dataset. Within CA, it ranks 1,718 of 2,555.
Learn more
Two guides worth reading on 95023: local microclimates, on what one yard in Hollister can differ from the 95023 normal, and zone vs. frost date, on why Zone 9b and Hollister's frost date answer different questions.