Mesa, AZ 85206 Frost Dates
Frost dates for Mesa, AZ, ZIP 85206
Around 02/01 is the usual last spring frost, about 157 days away. The first fall frost typically arrives around 12/10, about 312 frost-free days later.
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.
What to do before the first frost
Zone 9b around Mesa has about 15 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.
Why 02/01 isn't a guarantee
02/01 is the middle of 30 years of NOAA records, not a promise. Plant by 01/01 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 Mesa compares
Mesa's growing season runs about 312 days, ranking 3,452 of 40,283 US ZIP codes measured here, longest to shortest. Within AZ, it ranks 224 of 506.
Learn more
the frost range explains how to read the range around Mesa's dates instead of trusting one, and local microclimates explains what one yard in Mesa can differ from the 85206 normal.