Catasauqua, PA 18002 Frost Dates
18002, near Catasauqua, PA: the frost window
Around 04/20 is the usual last spring frost, about 235 days away. Fall's first freeze usually shows up around 10/24, roughly 184 days after the last spring frost.
Zone 7a (0 to 5°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 Catasauqua, not a forecast for this year.
Stretching the season past the first frost
Catasauqua'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 04/20 isn't a guarantee
04/20 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/06 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.
Catasauqua against the rest of the dataset
At roughly 184 frost-free days, Catasauqua places 23,487 of 40,283 ZIP codes in this dataset. Within PA, it ranks 770 of 2,088.
Learn more
Two guides worth reading on 18002: the frost range, on how to read the range around Catasauqua's dates instead of trusting one, and local microclimates, on what one yard in Catasauqua can differ from the 18002 normal.