Gilbert, AZ 85297 Frost Dates
85297, near Gilbert, AZ: the frost window
Typically, the last spring freeze lands around 02/01, roughly 157 days out. Fall's first freeze usually shows up around 12/11, roughly 315 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Gilbert in Zone 9b (25 to 30°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
Gilbert's growing season runs out in roughly 15 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 02/01 isn't a guarantee
02/01 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 01/02 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 02/27 and only about 1 year in 10 sees frost after that.
Gilbert against the rest of the dataset
About 315 days separate Gilbert's last and first frost, putting it 3,394 of 40,283 ZIP codes nationally. Within AZ, it ranks 206 of 506.
Learn more
Two guides worth reading on 85297: the frost range, on how to read the range around Gilbert's dates instead of trusting one, and local microclimates, on what one yard in Gilbert can differ from the 85297 normal.