Mesa, AZ 85204 Frost Dates
When can you plant in Mesa, AZ?
Around 02/13 is the usual last spring frost, about 169 days away. The first fall frost typically arrives around 12/05, about 298 frost-free days later.
Zone 9b (25 to 30°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Mesa, not a forecast for this year.
What to do before the first frost
About 14 weeks of growing season left in Mesa before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 02/13 isn't a guarantee
02/13 is the middle of 30 years of NOAA records, not a promise. Plant by 01/12 and you're betting against frost in roughly 9 years out of 10. 03/09 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Mesa compares
Mesa's growing season runs about 298 days, ranking 4,185 of 40,283 US ZIP codes measured here, longest to shortest. Within AZ, it ranks 256 of 506.
Learn more
the frost range covers how to read the range around Mesa's dates instead of trusting one. local microclimates covers what one yard in Mesa can differ from the 85204 normal.