Irvine, CA 92846 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 10a (30 to 35°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 287 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 82 of 2,555.
Learn more
the frost range covers how to read the range around Irvine's dates instead of trusting one. local microclimates covers what one yard in Irvine can differ from the 92846 normal.