Glendale, AZ 85031 Frost Dates
When can you plant in Glendale, AZ?
Typically, the last spring freeze lands around 01/21, roughly 146 days out. The first fall frost typically arrives around 12/16, 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
About 16 weeks of growing season left in Glendale before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Glendale's last frost
01/21 is the middle of 30 years of NOAA records, not a promise. Plant by 02/20 and you're betting against frost in roughly 9 years out of 10. 12/24 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Glendale compares
Glendale's growing season runs about 331 days, ranking 2,913 of 40,283 US ZIP codes measured here, longest to shortest. Within AZ, it ranks 160 of 506.
Learn more
local microclimates covers what one yard in Glendale can differ from the 85031 normal. zone vs. frost date covers why Zone 9b and Glendale's frost date answer different questions.