Jennerstown, PA 15555 Frost Dates
15555, near Jennerstown, PA: the frost window
Typically, the last spring freeze lands around 04/29, roughly 244 days out. Fall's first freeze usually shows up around 10/21, roughly 176 days after the last spring frost.
Zone 6a (-10 to -5°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Jennerstown, not a forecast for this year.
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.
The actual range around Jennerstown's last frost
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 26,582 of 40,283 ZIP codes nationally. Within PA, it ranks 1,082 of 2,088.
Learn more
Two guides worth reading on 15555: the frost range, on how to read the range around Jennerstown's dates instead of trusting one, and local microclimates, on what one yard in Jennerstown can differ from the 15555 normal.