Prescott, AZ 86321 Frost Dates
Prescott, AZ: when does the frost end?
Typically, the last spring freeze lands around 04/07, roughly 222 days out. Fall's first freeze usually shows up around 11/12, roughly 217 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Prescott in Zone 9a (20 to 25°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 11 weeks until Prescott's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/07 isn't a guarantee
04/07 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/14 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/03 and only about 1 year in 10 sees frost after that.
Prescott against the rest of the dataset
At roughly 217 frost-free days, Prescott places 13,402 of 40,283 ZIP codes in this dataset. Within AZ, it ranks 358 of 506.
Learn more
Before leaning on 86321'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 86321 normal.