Greencastle, PA 17235 Frost Dates
Frost dates for Greencastle, PA, ZIP 17235
Around 04/07 is the usual last spring frost, about 222 days away. The first fall frost typically arrives around 11/04, about 209 frost-free days later.
The USDA Plant Hardiness Zone Map puts Greencastle in Zone 7a (0 to 5°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 7a around Greencastle has about 10 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
The actual range around Greencastle's last frost
04/07 is the middle of 30 years of NOAA records, not a promise. Plant by 03/25 and you're betting against frost in roughly 9 years out of 10. 04/21 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Greencastle compares
At roughly 209 frost-free days, Greencastle places 15,229 of 40,283 ZIP codes in this dataset. Within PA, it ranks 85 of 2,088.
Learn more
local microclimates explains what one yard in Greencastle can differ from the 17235 normal, and zone vs. frost date explains why Zone 7a and Greencastle's frost date answer different questions.