Irvine, CA 92842 Frost Dates
When can you plant in Irvine, CA?
Typically, the last spring freeze lands around 01/05, roughly 130 days out. The first fall frost typically arrives around 12/25, about 365 frost-free days later.
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.
What to do before the first frost
About 17 weeks of growing season left in Irvine before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
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 286 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 81 of 2,555.
Learn more
local microclimates covers what one yard in Irvine can differ from the 92842 normal. zone vs. frost date covers why Zone 10b and Irvine's frost date answer different questions.