Corona, CA 92883 Frost Dates
Frost dates for Corona, CA, ZIP 92883
Typically, the last spring freeze lands around 01/28, roughly 153 days out. The first fall frost typically arrives around 12/18, about 329 frost-free days later.
Zone 10a (30 to 35°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Corona, not a forecast for this year.
What to do before the first frost
Zone 10a around Corona has about 16 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
01/28 is the middle of 30 years of NOAA records, not a promise. Plant by 02/27 and you're betting against frost in roughly 9 years out of 10. 12/24 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Corona compares
Corona's growing season runs about 329 days, ranking 3,071 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 1,324 of 2,555.
Learn more
zone vs. frost date explains why Zone 10a and Corona's frost date answer different questions, and the frost range explains how to read the range around Corona's dates instead of trusting one.