Jermyn, PA 18433 Frost Dates
18433, near Jermyn, PA: the frost window
Around 05/14 is the usual last spring frost, about 259 days away. Fall's first freeze usually shows up around 10/01, roughly 140 days after the last spring frost.
Jermyn 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
Jermyn's growing season runs out in roughly 5 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 Jermyn's last frost
05/14 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/30 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/29 and only about 1 year in 10 sees frost after that.
Jermyn against the rest of the dataset
Jermyn's growing season runs about 140 days, ranking 37,060 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 1,984 of 2,088.
Learn more
Two guides worth reading on 18433: zone vs. frost date, on why Zone 6a and Jermyn's frost date answer different questions, and the frost range, on how to read the range around Jermyn's dates instead of trusting one.