Kennett Square, PA 19348 Frost Dates
19348, near Kennett Square, PA: the frost window
Typically, the last spring freeze lands around 04/19, roughly 234 days out. Fall's first freeze usually shows up around 10/26, roughly 189 days after the last spring frost.
Kennett Square 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
Kennett Square'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.
How much risk comes with planting early here
04/19 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/01 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/03 and only about 1 year in 10 sees frost after that.
Kennett Square against the rest of the dataset
Kennett Square's growing season runs about 189 days, ranking 21,507 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 558 of 2,088.
Learn more
Two guides worth reading on 19348: zone vs. frost date, on why Zone 7a and Kennett Square's frost date answer different questions, and the frost range, on how to read the range around Kennett Square's dates instead of trusting one.