Lansdale, PA 19446 Frost Dates
19446, near Lansdale, PA: the frost window
Typically, the last spring freeze lands around 04/24, roughly 239 days out. Fall's first freeze usually shows up around 10/15, roughly 173 days after the last spring frost.
Lansdale sits in USDA Zone 7a (0 to 5°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
Lansdale'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 04/24 isn't a guarantee
04/24 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/10 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.
Lansdale against the rest of the dataset
Lansdale's growing season runs about 173 days, ranking 27,802 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 1,315 of 2,088.
Learn more
Two guides worth reading on 19446: local microclimates, on what one yard in Lansdale can differ from the 19446 normal, and zone vs. frost date, on why Zone 7a and Lansdale's frost date answer different questions.