Corona, CA 92881 Frost Dates
When can you plant in Corona, CA?
Typically, the last spring freeze lands around 01/09, roughly 134 days out. The first fall frost typically arrives around 12/30, about 362 frost-free days later.
Corona 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 18 weeks of growing season left in Corona before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 01/09 isn't a guarantee
01/09 is the middle of 30 years of NOAA records, not a promise. Plant by 02/21 and you're betting against frost in roughly 9 years out of 10. 12/16 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Corona compares
Corona's growing season runs about 362 days, ranking 2,058 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 944 of 2,555.
Learn more
local microclimates covers what one yard in Corona can differ from the 92881 normal. zone vs. frost date covers why Zone 10a and Corona's frost date answer different questions.