Fountain Hills, AZ 85263 Frost Dates
Frost dates for Fountain Hills, AZ, ZIP 85263
Typically, the last spring freeze lands around 01/06, roughly 131 days out. The first fall frost typically arrives around 12/28, about 356 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 Fountain Hills, not a forecast for this year.
What to do before the first frost
Zone 9b around Fountain Hills 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
01/06 is the middle of 30 years of NOAA records, not a promise. Plant by 02/11 and you're betting against frost in roughly 9 years out of 10. 12/14 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Fountain Hills compares
At roughly 356 frost-free days, Fountain Hills places 2,111 of 40,283 ZIP codes in this dataset. Within AZ, it ranks 35 of 506.
Learn more
local microclimates explains what one yard in Fountain Hills can differ from the 85263 normal, and zone vs. frost date explains why Zone 9b and Fountain Hills's frost date answer different questions.