Irvine, CA 92620 Frost Dates
Frost dates for Irvine, CA, ZIP 92620
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.
The actual range around Irvine's last frost
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 256 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 51 of 2,555.
Learn more
local microclimates explains what one yard in Irvine can differ from the 92620 normal, and zone vs. frost date explains why Zone 10a and Irvine's frost date answer different questions.