Casselman, PA 15540 Frost Dates
15540, near Casselman, PA: the frost window
The last spring frost here typically falls around 04/29, about 244 days from today. Fall's first freeze usually shows up around 10/18, roughly 171 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Casselman in Zone 6a (-10 to -5°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
Casselman'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 04/29 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 05/15 and only about 1 year in 10 sees frost after that.
Casselman against the rest of the dataset
At roughly 171 frost-free days, Casselman places 28,847 of 40,283 ZIP codes in this dataset. Within PA, it ranks 1,450 of 2,088.
Learn more
Two guides worth reading on 15540: local microclimates, on what one yard in Casselman can differ from the 15540 normal, and zone vs. frost date, on why Zone 6a and Casselman's frost date answer different questions.