Irvine, CA 92850 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.
How much risk comes with planting early here
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 288 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 83 of 2,555.
Learn more
Before leaning on 92850's figures: zone vs. frost date explains why Zone 10b and Irvine's frost date answer different questions, while the frost range explains how to read the range around Irvine's dates instead of trusting one.