Downingtown, PA 19397 Frost Dates
When can you plant in Downingtown, PA?
Typically, the last spring freeze lands around 04/26, roughly 241 days out. 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
About 7 weeks of growing season left in Downingtown before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
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
At roughly 174 frost-free days, Downingtown places 27,419 of 40,283 ZIP codes in this dataset. Within PA, it ranks 1,294 of 2,088.
Learn more
zone vs. frost date covers why Zone 7a and Downingtown's frost date answer different questions. the frost range covers how to read the range around Downingtown's dates instead of trusting one.