Selinsgrove, PA 17870 Frost Dates
17870, near Selinsgrove, PA: the frost window
Typically, the last spring freeze lands around 04/27, roughly 242 days out. Fall's first freeze usually shows up around 10/16, roughly 172 days after the last spring frost.
Zone 6b (-5 to 0°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 Selinsgrove, not a forecast for this year.
Stretching the season past the first frost
Selinsgrove's growing season runs out in roughly 7 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 04/27 isn't a guarantee
04/27 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/13 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/12 and only about 1 year in 10 sees frost after that.
Selinsgrove against the rest of the dataset
Selinsgrove's growing season runs about 172 days, ranking 28,271 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 1,352 of 2,088.
Learn more
Two guides worth reading on 17870: local microclimates, on what one yard in Selinsgrove can differ from the 17870 normal, and zone vs. frost date, on why Zone 6b and Selinsgrove's frost date answer different questions.