Bethel Park, PA 15241 Frost Dates
15241, near Bethel Park, 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.
The USDA Plant Hardiness Zone Map puts Bethel Park in Zone 6b (-5 to 0°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
Bethel Park'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.
Bethel Park against the rest of the dataset
At roughly 193 frost-free days, Bethel Park places 19,735 of 40,283 ZIP codes in this dataset. Within PA, it ranks 411 of 2,088.
Learn more
Two guides worth reading on 15241: the frost range, on how to read the range around Bethel Park's dates instead of trusting one, and local microclimates, on what one yard in Bethel Park can differ from the 15241 normal.