Downingtown, PA 19354 Frost Dates
Downingtown, PA: when does the frost end?
Typically, the last spring freeze lands around 04/11, roughly 226 days out. Fall's first freeze usually shows up around 11/01, roughly 205 days after the last spring frost.
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.
Stretching the season past the first frost
With roughly 9 weeks until Downingtown's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/11 isn't a guarantee
04/11 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/28 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/29 and only about 1 year in 10 sees frost after that.
Downingtown against the rest of the dataset
Downingtown's growing season runs about 205 days, ranking 16,217 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 131 of 2,088.
Learn more
Before leaning on 19354's figures: local microclimates explains what one yard in Downingtown can differ from the 19354 normal, while zone vs. frost date explains why Zone 7a and Downingtown's frost date answer different questions.