Irvine, CA 92618 Frost Dates
92618, near Irvine, CA: the frost window
The last spring frost here typically falls around 01/05, about 130 days from today. Fall's first freeze usually shows up around 12/25, roughly 365 days after the last spring frost.
Irvine sits in USDA Zone 10b (35 to 40°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
Irvine's growing season runs out in roughly 17 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
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
About 365 days separate Irvine's last and first frost, putting it 254 of 40,283 ZIP codes nationally. Within CA, it ranks 49 of 2,555.
Learn more
Two guides worth reading on 92618: zone vs. frost date, on why Zone 10b and Irvine's frost date answer different questions, and the frost range, on how to read the range around Irvine's dates instead of trusting one.