Irvine, CA 92605 Frost Dates
Irvine, CA: when does the frost end?
Around 01/05 is the usual last spring frost, about 130 days away. Fall's first freeze usually shows up around 12/25, roughly 365 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Irvine in Zone 10b (35 to 40°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's 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
At roughly 365 frost-free days, Irvine places 248 of 40,283 ZIP codes in this dataset. Within CA, it ranks 43 of 2,555.
Learn more
Before leaning on 92605'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 92605 normal.