Boyertown, PA 19519 Frost Dates
Boyertown, PA: when does the frost end?
Typically, the last spring freeze lands around 04/20, roughly 235 days out. Fall's first freeze usually shows up around 10/23, roughly 186 days after the last spring frost.
Boyertown 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 8 weeks until Boyertown's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Boyertown's last frost
04/20 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/05 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/06 and only about 1 year in 10 sees frost after that.
Boyertown against the rest of the dataset
About 186 days separate Boyertown's last and first frost, putting it 22,790 of 40,283 ZIP codes nationally. Within PA, it ranks 657 of 2,088.
Learn more
Before leaning on 19519's figures: local microclimates explains what one yard in Boyertown can differ from the 19519 normal, while zone vs. frost date explains why Zone 7a and Boyertown's frost date answer different questions.