Mechanicsburg, PA 17050 Frost Dates
17050, near Mechanicsburg, PA: the frost window
The last spring frost here typically falls around 04/09, about 224 days from today. Fall's first freeze usually shows up around 11/01, roughly 205 days after the last spring frost.
Mechanicsburg 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
Mechanicsburg'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.
How much risk comes with planting early here
04/09 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/27 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/25 and only about 1 year in 10 sees frost after that.
Mechanicsburg against the rest of the dataset
About 205 days separate Mechanicsburg's last and first frost, putting it 16,206 of 40,283 ZIP codes nationally. Within PA, it ranks 127 of 2,088.
Learn more
Two guides worth reading on 17050: the frost range, on how to read the range around Mechanicsburg's dates instead of trusting one, and local microclimates, on what one yard in Mechanicsburg can differ from the 17050 normal.