Phoenix, AZ 85053 Frost Dates
Phoenix, AZ: when does the frost end?
The last spring frost here typically falls around 01/08, about 133 days from today. Fall's first freeze usually shows up around 12/25, roughly 354 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Phoenix in Zone 9b (25 to 30°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 17 weeks until Phoenix'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
01/08 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/12 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/16 and only about 1 year in 10 sees frost after that.
Phoenix against the rest of the dataset
At roughly 354 frost-free days, Phoenix places 2,158 of 40,283 ZIP codes in this dataset. Within AZ, it ranks 46 of 506.
Learn more
Before leaning on 85053's figures: local microclimates explains what one yard in Phoenix can differ from the 85053 normal, while zone vs. frost date explains why Zone 9b and Phoenix's frost date answer different questions.