Gilroy, CA 95021 Frost Dates
Gilroy, CA: when does the frost end?
The last spring frost here typically falls around 02/24, about 180 days from today. Fall's first freeze usually shows up around 11/27, roughly 277 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 Gilroy, not a forecast for this year.
Stretching the season past the first frost
With roughly 13 weeks until Gilroy's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 02/24 isn't a guarantee
02/24 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 04/04 and only about 1 year in 10 sees frost after that.
Gilroy against the rest of the dataset
At roughly 277 frost-free days, Gilroy places 4,960 of 40,283 ZIP codes in this dataset. Within CA, it ranks 1,815 of 2,555.
Learn more
Before leaning on 95021's figures: the frost range explains how to read the range around Gilroy's dates instead of trusting one, while local microclimates explains what one yard in Gilroy can differ from the 95021 normal.