Irvine, CA 92652 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.
Irvine sits in USDA Zone 10a (30 to 35°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
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.
Why 01/05 isn't a guarantee
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
About 365 days separate Irvine's last and first frost, putting it 259 of 40,283 ZIP codes nationally. Within CA, it ranks 54 of 2,555.
Learn more
Before leaning on 92652's figures: local microclimates explains what one yard in Irvine can differ from the 92652 normal, while zone vs. frost date explains why Zone 10a and Irvine's frost date answer different questions.