Greensburg, PA 15633 Frost Dates
15633, near Greensburg, PA: the frost window
Typically, the last spring freeze lands around 05/01, roughly 246 days out. Fall's first freeze usually shows up around 10/13, roughly 164 days after the last spring frost.
Greensburg sits in USDA Zone 6b (-5 to 0°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
Greensburg's growing season runs out in roughly 7 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 05/01 isn't a guarantee
05/01 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 05/19 and only about 1 year in 10 sees frost after that.
Greensburg against the rest of the dataset
At roughly 164 frost-free days, Greensburg places 30,864 of 40,283 ZIP codes in this dataset. Within PA, it ranks 1,555 of 2,088.
Learn more
Two guides worth reading on 15633: local microclimates, on what one yard in Greensburg can differ from the 15633 normal, and zone vs. frost date, on why Zone 6b and Greensburg's frost date answer different questions.