Donora, PA 15087 Frost Dates
Donora, PA: when does the frost end?
Around 05/02 is the usual last spring frost, about 247 days away. Fall's first freeze usually shows up around 10/20, roughly 170 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Donora 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 8 weeks until Donora'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
05/02 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/17 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/20 and only about 1 year in 10 sees frost after that.
Donora against the rest of the dataset
About 170 days separate Donora's last and first frost, putting it 28,992 of 40,283 ZIP codes nationally. Within PA, it ranks 1,467 of 2,088.
Learn more
Before leaning on 15087's figures: the frost range explains how to read the range around Donora's dates instead of trusting one, while local microclimates explains what one yard in Donora can differ from the 15087 normal.