Yucaipa, CA 92399 Frost Dates
Frost dates for Yucaipa, CA, ZIP 92399
The last spring frost here typically falls around 01/27, about 152 days from today. The first fall frost typically arrives around 12/19, about 329 frost-free days later.
The USDA Plant Hardiness Zone Map puts Yucaipa in Zone 9b (25 to 30°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 9b around Yucaipa 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
01/27 is the middle of 30 years of NOAA records, not a promise. Plant by 02/28 and you're betting against frost in roughly 9 years out of 10. 12/21 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Yucaipa compares
At roughly 329 frost-free days, Yucaipa places 3,086 of 40,283 ZIP codes in this dataset. Within CA, it ranks 1,339 of 2,555.
Learn more
local microclimates explains what one yard in Yucaipa can differ from the 92399 normal, and zone vs. frost date explains why Zone 9b and Yucaipa's frost date answer different questions.