Glendale, AZ 85305 Frost Dates
Frost dates for Glendale, AZ, ZIP 85305
Around 01/20 is the usual last spring frost, about 145 days away. The first fall frost typically arrives around 12/15, about 331 frost-free days later.
The USDA Plant Hardiness Zone Map puts Glendale 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 Glendale has about 16 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.
How much risk comes with planting early here
01/20 is the middle of 30 years of NOAA records, not a promise. Plant by 02/18 and you're betting against frost in roughly 9 years out of 10. 12/23 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Glendale compares
About 331 days separate Glendale's last and first frost, putting it 2,920 of 40,283 ZIP codes nationally. Within AZ, it ranks 167 of 506.
Learn more
the frost range explains how to read the range around Glendale's dates instead of trusting one, and local microclimates explains what one yard in Glendale can differ from the 85305 normal.