Mesa, AZ 85207 Frost Dates
85207, near Mesa, 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 12/10, roughly 312 days after the last spring frost.
Mesa sits in USDA Zone 9b (25 to 30°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
Mesa'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.
How much risk comes with planting early here
02/01 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 01/01 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.
Mesa against the rest of the dataset
At roughly 312 frost-free days, Mesa places 3,453 of 40,283 ZIP codes in this dataset. Within AZ, it ranks 225 of 506.
Learn more
Two guides worth reading on 85207: local microclimates, on what one yard in Mesa can differ from the 85207 normal, and zone vs. frost date, on why Zone 9b and Mesa's frost date answer different questions.