Pottstown, PA 19465 Frost Dates
Frost dates for Pottstown, PA, ZIP 19465
Typically, the last spring freeze lands around 04/20, roughly 235 days out. The first fall frost typically arrives around 10/23, about 186 frost-free days later.
The USDA Plant Hardiness Zone Map puts Pottstown 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 Pottstown has about 8 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.
Why 04/20 isn't a guarantee
04/20 is the middle of 30 years of NOAA records, not a promise. Plant by 04/05 and you're betting against frost in roughly 9 years out of 10. 05/06 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Pottstown compares
About 186 days separate Pottstown's last and first frost, putting it 22,722 of 40,283 ZIP codes nationally. Within PA, it ranks 640 of 2,088.
Learn more
zone vs. frost date explains why Zone 7a and Pottstown's frost date answer different questions, and the frost range explains how to read the range around Pottstown's dates instead of trusting one.