Norristown, PA 19462 Frost Dates
Frost dates for Norristown, PA, ZIP 19462
The last spring frost here typically falls around 04/08, about 223 days from today. The first fall frost typically arrives around 10/31, about 203 frost-free days later.
Zone 7b (5 to 10°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 Norristown, not a forecast for this year.
What to do before the first frost
Zone 7b around Norristown 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.
Why 04/08 isn't a guarantee
04/08 is the middle of 30 years of NOAA records, not a promise. Plant by 03/28 and you're betting against frost in roughly 9 years out of 10. 04/23 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Norristown compares
At roughly 203 frost-free days, Norristown places 16,847 of 40,283 ZIP codes in this dataset. Within PA, it ranks 190 of 2,088.
Learn more
the frost range explains how to read the range around Norristown's dates instead of trusting one, and local microclimates explains what one yard in Norristown can differ from the 19462 normal.