Madison, PA 15637 Frost Dates
Frost dates for Madison, PA, ZIP 15637
The last spring frost here typically falls around 05/02, about 247 days from today. The first fall frost typically arrives around 10/20, about 170 frost-free days later.
Madison sits in USDA Zone 6b (-5 to 0°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 6b around Madison 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 05/02 isn't a guarantee
05/02 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. 05/20 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Madison compares
At roughly 170 frost-free days, Madison places 29,212 of 40,283 ZIP codes in this dataset. Within PA, it ranks 1,507 of 2,088.
Learn more
local microclimates explains what one yard in Madison can differ from the 15637 normal, and zone vs. frost date explains why Zone 6b and Madison's frost date answer different questions.