Hallam, PA 17405 Frost Dates
17405, near Hallam, PA: the frost window
Typically, the last spring freeze lands around 04/26, roughly 241 days out. Fall's first freeze usually shows up around 10/19, roughly 177 days after the last spring frost.
Hallam sits in USDA Zone 7a (0 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
Hallam'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.
The actual range around Hallam's last frost
04/26 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/07 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/13 and only about 1 year in 10 sees frost after that.
Hallam against the rest of the dataset
Hallam's growing season runs about 177 days, ranking 26,124 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 949 of 2,088.
Learn more
Two guides worth reading on 17405: the frost range, on how to read the range around Hallam's dates instead of trusting one, and local microclimates, on what one yard in Hallam can differ from the 17405 normal.