Downingtown, PA 19495 Frost Dates
19495, near Downingtown, PA: the frost window
The last spring frost here typically falls around 04/26, about 241 days from today. Fall's first freeze usually shows up around 10/18, roughly 174 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 Downingtown, not a forecast for this year.
Stretching the season past the first frost
Downingtown'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.
The actual range around Downingtown's last frost
04/26 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 05/11 and only about 1 year in 10 sees frost after that.
Downingtown against the rest of the dataset
At roughly 174 frost-free days, Downingtown places 27,424 of 40,283 ZIP codes in this dataset. Within PA, it ranks 1,299 of 2,088.
Learn more
Two guides worth reading on 19495: zone vs. frost date, on why Zone 7a and Downingtown's frost date answer different questions, and the frost range, on how to read the range around Downingtown's dates instead of trusting one.