Casa Grande, AZ 85194 Frost Dates
Frost dates for Casa Grande, AZ, ZIP 85194
Typically, the last spring freeze lands around 02/05, roughly 161 days out. The first fall frost typically arrives around 12/06, about 305 frost-free days later.
The USDA Plant Hardiness Zone Map puts Casa Grande in Zone 9a (20 to 25°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 9a around Casa Grande 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
02/05 is the middle of 30 years of NOAA records, not a promise. Plant by 01/05 and you're betting against frost in roughly 9 years out of 10. 02/28 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Casa Grande compares
At roughly 305 frost-free days, Casa Grande places 3,732 of 40,283 ZIP codes in this dataset. Within AZ, it ranks 249 of 506.
Learn more
the frost range explains how to read the range around Casa Grande's dates instead of trusting one, and local microclimates explains what one yard in Casa Grande can differ from the 85194 normal.