Fountain Hills, AZ 85268 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.
Fountain Hills sits in USDA Zone 9b (25 to 30°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
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.
Why 01/06 isn't a guarantee
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 2,113 of 40,283 ZIP codes nationally. Within AZ, it ranks 37 of 506.
Learn more
Before leaning on 85268's figures: local microclimates explains what one yard in Fountain Hills can differ from the 85268 normal, while zone vs. frost date explains why Zone 9b and Fountain Hills's frost date answer different questions.