Derry, PA 15627 Frost Dates
Frost dates for Derry, PA, ZIP 15627
Typically, the last spring freeze lands around 05/01, roughly 246 days out. The first fall frost typically arrives around 10/13, about 164 frost-free days later.
Zone 6b (-5 to 0°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 Derry, not a forecast for this year.
What to do before the first frost
Zone 6b around Derry has about 7 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 Derry's last frost
05/01 is the middle of 30 years of NOAA records, not a promise. Plant by 04/17 and you're betting against frost in roughly 9 years out of 10. 05/19 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Derry compares
About 164 days separate Derry's last and first frost, putting it 30,965 of 40,283 ZIP codes nationally. Within PA, it ranks 1,581 of 2,088.
Learn more
local microclimates explains what one yard in Derry can differ from the 15627 normal, and zone vs. frost date explains why Zone 6b and Derry's frost date answer different questions.