Corona, CA 92879 Frost Dates
Corona, CA: when does the frost end?
Typically, the last spring freeze lands around 01/09, roughly 134 days out. Fall's first freeze usually shows up around 12/30, 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 Corona, not a forecast for this year.
Stretching the season past the first frost
With roughly 18 weeks until Corona's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Corona's last frost
01/09 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/21 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/16 and only about 1 year in 10 sees frost after that.
Corona against the rest of the dataset
About 362 days separate Corona's last and first frost, putting it 2,057 of 40,283 ZIP codes nationally. Within CA, it ranks 943 of 2,555.
Learn more
Before leaning on 92879's figures: the frost range explains how to read the range around Corona's dates instead of trusting one, while local microclimates explains what one yard in Corona can differ from the 92879 normal.