Penbrook, PA 17177 Frost Dates
Frost dates for Penbrook, PA, ZIP 17177
Typically, the last spring freeze lands around 04/09, roughly 224 days out. The first fall frost typically arrives around 11/01, about 205 frost-free days later.
The USDA Plant Hardiness Zone Map puts Penbrook 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 Penbrook has about 9 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 Penbrook's last frost
04/09 is the middle of 30 years of NOAA records, not a promise. Plant by 03/27 and you're betting against frost in roughly 9 years out of 10. 04/25 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Penbrook compares
At roughly 205 frost-free days, Penbrook places 16,300 of 40,283 ZIP codes in this dataset. Within PA, it ranks 160 of 2,088.
Learn more
local microclimates explains what one yard in Penbrook can differ from the 17177 normal, and zone vs. frost date explains why Zone 7a and Penbrook's frost date answer different questions.