Penbrook, PA 17106 Frost Dates
Frost dates for Penbrook, PA, ZIP 17106
The last spring frost here typically falls around 04/09, about 224 days from today. The first fall frost typically arrives around 11/01, about 205 frost-free days later.
Penbrook sits in USDA Zone 7a (0 to 5°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a 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
Penbrook's growing season runs about 205 days, ranking 16,295 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 155 of 2,088.
Learn more
zone vs. frost date explains why Zone 7a and Penbrook's frost date answer different questions, and the frost range explains how to read the range around Penbrook's dates instead of trusting one.