Casa Grande, AZ 85193 Frost Dates
85193, near Casa Grande, AZ: the frost window
Typically, the last spring freeze lands around 02/05, roughly 161 days out. Fall's first freeze usually shows up around 12/06, roughly 305 days after the last spring frost.
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.
Stretching the season past the first frost
Casa Grande's growing season runs out in roughly 14 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Casa Grande's last frost
02/05 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 01/05 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 02/28 and only about 1 year in 10 sees frost after that.
Casa Grande against the rest of the dataset
Casa Grande's growing season runs about 305 days, ranking 3,731 of 40,283 US ZIP codes measured here, longest to shortest. Within AZ, it ranks 248 of 506.
Learn more
Two guides worth reading on 85193: local microclimates, on what one yard in Casa Grande can differ from the 85193 normal, and zone vs. frost date, on why Zone 9a and Casa Grande's frost date answer different questions.