Greencastle, PA 17256 Frost Dates
Greencastle, PA: when does the frost end?
The last spring frost here typically falls around 04/07, about 222 days from today. Fall's first freeze usually shows up around 11/04, roughly 209 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 Greencastle, not a forecast for this year.
Stretching the season past the first frost
With roughly 10 weeks until Greencastle's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/07 isn't a guarantee
04/07 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/25 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/21 and only about 1 year in 10 sees frost after that.
Greencastle against the rest of the dataset
At roughly 209 frost-free days, Greencastle places 15,230 of 40,283 ZIP codes in this dataset. Within PA, it ranks 86 of 2,088.
Learn more
Before leaning on 17256's figures: local microclimates explains what one yard in Greencastle can differ from the 17256 normal, while zone vs. frost date explains why Zone 7a and Greencastle's frost date answer different questions.