Irvine, CA 90622 Frost Dates
Frost dates for Irvine, CA, ZIP 90622
The last spring frost here typically falls around 01/05, about 130 days from today. The first fall frost typically arrives around 12/25, about 365 frost-free days later.
The USDA Plant Hardiness Zone Map puts Irvine in Zone 10a (30 to 35°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 10a around Irvine has about 17 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
How much risk comes with planting early here
01/05 is the middle of 30 years of NOAA records, not a promise. Plant by 02/02 and you're betting against frost in roughly 9 years out of 10. 12/14 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Irvine compares
Irvine's growing season runs about 365 days, ranking 241 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 36 of 2,555.
Learn more
the frost range explains how to read the range around Irvine's dates instead of trusting one, and local microclimates explains what one yard in Irvine can differ from the 90622 normal.