Weatherly, PA 18255 Frost Dates
18255, near Weatherly, PA: the frost window
Typically, the last spring freeze lands around 04/21, roughly 236 days out. Fall's first freeze usually shows up around 10/23, roughly 184 days after the last spring frost.
Weatherly 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
Weatherly's growing season runs out in roughly 8 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 04/21 isn't a guarantee
04/21 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/07 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/09 and only about 1 year in 10 sees frost after that.
Weatherly against the rest of the dataset
Weatherly's growing season runs about 184 days, ranking 23,558 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 802 of 2,088.
Learn more
Two guides worth reading on 18255: local microclimates, on what one yard in Weatherly can differ from the 18255 normal, and zone vs. frost date, on why Zone 6b and Weatherly's frost date answer different questions.