Pomona, CA 91767 Frost Dates
Frost dates for Pomona, CA, ZIP 91767
Typically, the last spring freeze lands around 01/08, roughly 133 days out. The first fall frost typically arrives around 12/28, about 354 frost-free days later.
The USDA Plant Hardiness Zone Map puts Pomona in Zone 10a (30 to 35°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 10a around Pomona has about 17 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
01/08 is the middle of 30 years of NOAA records, not a promise. Plant by 02/18 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 Pomona compares
Pomona's growing season runs about 354 days, ranking 2,165 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 969 of 2,555.
Learn more
the frost range explains how to read the range around Pomona's dates instead of trusting one, and local microclimates explains what one yard in Pomona can differ from the 91767 normal.