Mesa, AZ 85205 Frost Dates
Mesa, AZ: when does the frost end?
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.
The USDA Plant Hardiness Zone Map puts Mesa 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
With roughly 15 weeks until Mesa's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
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
About 312 days separate Mesa's last and first frost, putting it 3,451 of 40,283 ZIP codes nationally. Within AZ, it ranks 223 of 506.
Learn more
Before leaning on 85205's figures: local microclimates explains what one yard in Mesa can differ from the 85205 normal, while zone vs. frost date explains why Zone 9b and Mesa's frost date answer different questions.