Kittanning, PA 16259 Frost Dates
Kittanning, PA: when does the frost end?
Typically, the last spring freeze lands around 05/10, roughly 255 days out. Fall's first freeze usually shows up around 10/12, roughly 155 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Kittanning in Zone 6b (-5 to 0°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 6 weeks until Kittanning's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 05/10 isn't a guarantee
05/10 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/24 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/28 and only about 1 year in 10 sees frost after that.
Kittanning against the rest of the dataset
At roughly 155 frost-free days, Kittanning places 33,969 of 40,283 ZIP codes in this dataset. Within PA, it ranks 1,779 of 2,088.
Learn more
Before leaning on 16259's figures: the frost range explains how to read the range around Kittanning's dates instead of trusting one, while local microclimates explains what one yard in Kittanning can differ from the 16259 normal.