Green Tree, PA 15220 Frost Dates
15220, near Green Tree, PA: the frost window
Around 04/18 is the usual last spring frost, about 233 days away. Fall's first freeze usually shows up around 10/28, roughly 193 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 Green Tree, not a forecast for this year.
Stretching the season past the first frost
Green Tree's growing season runs out in roughly 9 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 04/18 isn't a guarantee
04/18 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/02 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/06 and only about 1 year in 10 sees frost after that.
Green Tree against the rest of the dataset
Green Tree's growing season runs about 193 days, ranking 19,851 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 434 of 2,088.
Learn more
Two guides worth reading on 15220: local microclimates, on what one yard in Green Tree can differ from the 15220 normal, and zone vs. frost date, on why Zone 6b and Green Tree's frost date answer different questions.