Butler, PA 16021 Frost Dates
Butler, PA: when does the frost end?
The last spring frost here typically falls around 04/16, about 231 days from today. Fall's first freeze usually shows up around 11/02, roughly 199 days after the last spring frost.
Butler sits in USDA Zone 6a (-10 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 Butler's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/16 isn't a guarantee
04/16 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/31 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/02 and only about 1 year in 10 sees frost after that.
Butler against the rest of the dataset
Butler's growing season runs about 199 days, ranking 18,059 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 288 of 2,088.
Learn more
Before leaning on 16021's figures: local microclimates explains what one yard in Butler can differ from the 16021 normal, while zone vs. frost date explains why Zone 6a and Butler's frost date answer different questions.