Grover Beach, CA 93433 Frost Dates
Grover Beach, CA: when does the frost end?
Typically, the last spring freeze lands around 02/01, roughly 157 days out. Fall's first freeze usually shows up around 01/04, roughly 362 days after the last spring frost.
Zone 10a (30 to 35°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 Grover Beach, not a forecast for this year.
Stretching the season past the first frost
With roughly 18 weeks until Grover Beach's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 02/01 isn't a guarantee
02/01 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/13 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/18 and only about 1 year in 10 sees frost after that.
Grover Beach against the rest of the dataset
At roughly 362 frost-free days, Grover Beach places 2,075 of 40,283 ZIP codes in this dataset. Within CA, it ranks 957 of 2,555.
Learn more
Before leaning on 93433's figures: the frost range explains how to read the range around Grover Beach's dates instead of trusting one, while local microclimates explains what one yard in Grover Beach can differ from the 93433 normal.