Irvine, CA 92814 Frost Dates
Irvine, CA: when does the frost end?
Typically, the last spring freeze lands around 01/05, roughly 130 days out. Fall's first freeze usually shows up around 12/25, roughly 365 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 Irvine, not a forecast for this year.
Stretching the season past the first frost
With roughly 17 weeks until Irvine's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Irvine's last frost
01/05 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/02 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/14 and only about 1 year in 10 sees frost after that.
Irvine against the rest of the dataset
Irvine's growing season runs about 365 days, ranking 276 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 71 of 2,555.
Learn more
Before leaning on 92814's figures: the frost range explains how to read the range around Irvine's dates instead of trusting one, while local microclimates explains what one yard in Irvine can differ from the 92814 normal.