Kennett Square, PA 19375 Frost Dates
19375, near Kennett Square, PA: the frost window
Around 04/19 is the usual last spring frost, about 234 days away. Fall's first freeze usually shows up around 10/26, roughly 189 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 Kennett Square, not a forecast for this year.
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
At roughly 189 frost-free days, Kennett Square places 21,508 of 40,283 ZIP codes in this dataset. Within PA, it ranks 559 of 2,088.
Learn more
Two guides worth reading on 19375: local microclimates, on what one yard in Kennett Square can differ from the 19375 normal, and zone vs. frost date, on why Zone 7a and Kennett Square's frost date answer different questions.