Donora, PA 15033 Frost Dates
When can you plant in Donora, PA?
Typically, the last spring freeze lands around 05/02, roughly 247 days out. The first fall frost typically arrives around 10/20, about 170 frost-free days later.
Zone 6b (-5 to 0°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Donora, not a forecast for this year.
What to do before the first frost
About 8 weeks of growing season left in Donora before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/02 isn't a guarantee
05/02 is the middle of 30 years of NOAA records, not a promise. Plant by 04/17 and you're betting against frost in roughly 9 years out of 10. 05/20 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Donora compares
At roughly 170 frost-free days, Donora places 28,991 of 40,283 ZIP codes in this dataset. Within PA, it ranks 1,466 of 2,088.
Learn more
the frost range covers how to read the range around Donora's dates instead of trusting one. local microclimates covers what one yard in Donora can differ from the 15033 normal.