Pittsburgh, PA 15219 Frost Dates
15219, near Pittsburgh, PA: the frost window
Typically, the last spring freeze lands around 04/18, roughly 233 days out. Fall's first freeze usually shows up around 10/28, roughly 193 days after the last spring frost.
Pittsburgh 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
Pittsburgh's growing season runs out in roughly 9 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Pittsburgh's last frost
04/18 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/02 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/06 and only about 1 year in 10 sees frost after that.
Pittsburgh against the rest of the dataset
Pittsburgh's growing season runs about 193 days, ranking 19,672 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 407 of 2,088.
Learn more
Two guides worth reading on 15219: local microclimates, on what one yard in Pittsburgh can differ from the 15219 normal, and zone vs. frost date, on why Zone 6b and Pittsburgh's frost date answer different questions.