Pen Argyl, PA 18354 Frost Dates
18354, near Pen Argyl, PA: the frost window
Typically, the last spring freeze lands around 05/06, roughly 251 days out. Fall's first freeze usually shows up around 10/08, roughly 154 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Pen Argyl 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
Pen Argyl's growing season runs out in roughly 6 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
05/06 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/21 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/23 and only about 1 year in 10 sees frost after that.
Pen Argyl against the rest of the dataset
At roughly 154 frost-free days, Pen Argyl places 34,285 of 40,283 ZIP codes in this dataset. Within PA, it ranks 1,869 of 2,088.
Learn more
Two guides worth reading on 18354: local microclimates, on what one yard in Pen Argyl can differ from the 18354 normal, and zone vs. frost date, on why Zone 6b and Pen Argyl's frost date answer different questions.