Dallastown, PA 17313 Frost Dates
17313, near Dallastown, PA: the frost window
Typically, the last spring freeze lands around 04/26, roughly 241 days out. Fall's first freeze usually shows up around 10/19, roughly 177 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 Dallastown, not a forecast for this year.
Stretching the season past the first frost
Dallastown'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 Dallastown's last frost
04/26 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/07 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/13 and only about 1 year in 10 sees frost after that.
Dallastown against the rest of the dataset
At roughly 177 frost-free days, Dallastown places 26,110 of 40,283 ZIP codes in this dataset. Within PA, it ranks 948 of 2,088.
Learn more
Two guides worth reading on 17313: zone vs. frost date, on why Zone 7a and Dallastown's frost date answer different questions, and the frost range, on how to read the range around Dallastown's dates instead of trusting one.