Downingtown, PA 19351 Frost Dates
Frost dates for Downingtown, PA, ZIP 19351
The last spring frost here typically falls around 04/26, about 241 days from today. The first fall frost typically arrives around 10/18, about 174 frost-free days later.
Downingtown 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 Downingtown has about 7 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 Downingtown's last frost
04/26 is the middle of 30 years of NOAA records, not a promise. Plant by 04/10 and you're betting against frost in roughly 9 years out of 10. 05/11 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Downingtown compares
About 174 days separate Downingtown's last and first frost, putting it 27,413 of 40,283 ZIP codes nationally. Within PA, it ranks 1,288 of 2,088.
Learn more
local microclimates explains what one yard in Downingtown can differ from the 19351 normal, and zone vs. frost date explains why Zone 7a and Downingtown's frost date answer different questions.