Carrolltown, PA 15737 Frost Dates
15737, near Carrolltown, PA: the frost window
The last spring frost here typically falls around 04/29, about 244 days from today. Fall's first freeze usually shows up around 10/21, roughly 176 days after the last spring frost.
Zone 6a (-10 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 Carrolltown, not a forecast for this year.
Stretching the season past the first frost
Carrolltown'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 04/29 isn't a guarantee
04/29 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/14 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/17 and only about 1 year in 10 sees frost after that.
Carrolltown against the rest of the dataset
At roughly 176 frost-free days, Carrolltown places 26,541 of 40,283 ZIP codes in this dataset. Within PA, it ranks 1,066 of 2,088.
Learn more
Two guides worth reading on 15737: local microclimates, on what one yard in Carrolltown can differ from the 15737 normal, and zone vs. frost date, on why Zone 6a and Carrolltown's frost date answer different questions.