Tolleson, AZ 85037 Frost Dates
Frost dates for Tolleson, AZ, ZIP 85037
Typically, the last spring freeze lands around 01/07, roughly 132 days out. The first fall frost typically arrives around 12/24, about 351 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 Tolleson, not a forecast for this year.
What to do before the first frost
Zone 9b around Tolleson 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.
How much risk comes with planting early here
01/07 is the middle of 30 years of NOAA records, not a promise. Plant by 02/05 and you're betting against frost in roughly 9 years out of 10. 12/17 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Tolleson compares
Tolleson's growing season runs about 351 days, ranking 2,304 of 40,283 US ZIP codes measured here, longest to shortest. Within AZ, it ranks 66 of 506.
Learn more
local microclimates explains what one yard in Tolleson can differ from the 85037 normal, and zone vs. frost date explains why Zone 9b and Tolleson's frost date answer different questions.