Jennerstown, PA 15520 Frost Dates
15520, near Jennerstown, PA: the frost window
Around 04/29 is the usual last spring frost, about 244 days away. Fall's first freeze usually shows up around 10/21, roughly 176 days after the last spring frost.
Jennerstown 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
Jennerstown's growing season runs out in roughly 8 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 04/29 isn't a guarantee
04/29 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/14 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/17 and only about 1 year in 10 sees frost after that.
Jennerstown against the rest of the dataset
About 176 days separate Jennerstown's last and first frost, putting it 26,577 of 40,283 ZIP codes nationally. Within PA, it ranks 1,077 of 2,088.
Learn more
Two guides worth reading on 15520: local microclimates, on what one yard in Jennerstown can differ from the 15520 normal, and zone vs. frost date, on why Zone 6a and Jennerstown's frost date answer different questions.