Prescott, AZ 86303 Frost Dates
Prescott, AZ: when does the frost end?
Typically, the last spring freeze lands around 04/30, roughly 245 days out. Fall's first freeze usually shows up around 10/20, roughly 172 days after the last spring frost.
Prescott sits in USDA Zone 7b (5 to 10°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 8 weeks until Prescott's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Prescott's last frost
04/30 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/14 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/15 and only about 1 year in 10 sees frost after that.
Prescott against the rest of the dataset
At roughly 172 frost-free days, Prescott places 28,157 of 40,283 ZIP codes in this dataset. Within AZ, it ranks 439 of 506.
Learn more
Before leaning on 86303's figures: the frost range explains how to read the range around Prescott's dates instead of trusting one, while local microclimates explains what one yard in Prescott can differ from the 86303 normal.