Phoenix, AZ 85013 Frost Dates
Phoenix, AZ: when does the frost end?
The last spring frost here typically falls around 01/05, about 130 days from today. Fall's first freeze usually shows up around 01/03, roughly 365 days after the last spring frost.
Phoenix 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 18 weeks until Phoenix's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 01/05 isn't a guarantee
01/05 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 01/22 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/19 and only about 1 year in 10 sees frost after that.
Phoenix against the rest of the dataset
Phoenix's growing season runs about 365 days, ranking 10 of 40,283 US ZIP codes measured here, longest to shortest. Within AZ, it ranks 5 of 506.
Learn more
Before leaning on 85013's figures: the frost range explains how to read the range around Phoenix's dates instead of trusting one, while local microclimates explains what one yard in Phoenix can differ from the 85013 normal.