Hesperia, CA 92345 Frost Dates
Frost dates for Hesperia, CA, ZIP 92345
Typically, the last spring freeze lands around 02/28, roughly 184 days out. The first fall frost typically arrives around 12/01, about 270 frost-free days later.
The USDA Plant Hardiness Zone Map puts Hesperia in Zone 8b (15 to 20°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 8b around Hesperia has about 14 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
02/28 is the middle of 30 years of NOAA records, not a promise. Plant by 02/01 and you're betting against frost in roughly 9 years out of 10. 04/03 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Hesperia compares
At roughly 270 frost-free days, Hesperia places 5,477 of 40,283 ZIP codes in this dataset. Within CA, it ranks 1,899 of 2,555.
Learn more
local microclimates explains what one yard in Hesperia can differ from the 92345 normal, and zone vs. frost date explains why Zone 8b and Hesperia's frost date answer different questions.