Phoenix, AZ 85306 Frost Dates
Frost dates for Phoenix, AZ, ZIP 85306
Typically, the last spring freeze lands around 01/08, roughly 133 days out. The first fall frost typically arrives around 12/25, about 354 frost-free days later.
The USDA Plant Hardiness Zone Map puts Phoenix 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 Phoenix has about 17 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.
The actual range around Phoenix's last frost
01/08 is the middle of 30 years of NOAA records, not a promise. Plant by 02/12 and you're betting against frost in roughly 9 years out of 10. 12/16 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Phoenix compares
About 354 days separate Phoenix's last and first frost, putting it 2,159 of 40,283 ZIP codes nationally. Within AZ, it ranks 47 of 506.
Learn more
the frost range explains how to read the range around Phoenix's dates instead of trusting one, and local microclimates explains what one yard in Phoenix can differ from the 85306 normal.