Fountain Hills, AZ 85264 Frost Dates
Fountain Hills, AZ: when does the frost end?
The last spring frost here typically falls around 01/06, about 131 days from today. Fall's first freeze usually shows up around 12/28, roughly 356 days after the last spring frost.
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.
Stretching the season past the first frost
With roughly 17 weeks until Fountain Hills's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
01/06 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/11 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/14 and only about 1 year in 10 sees frost after that.
Fountain Hills against the rest of the dataset
About 356 days separate Fountain Hills's last and first frost, putting it 2,112 of 40,283 ZIP codes nationally. Within AZ, it ranks 36 of 506.
Learn more
Before leaning on 85264's figures: the frost range explains how to read the range around Fountain Hills's dates instead of trusting one, while local microclimates explains what one yard in Fountain Hills can differ from the 85264 normal.