Mohnton, PA 19540 Frost Dates
Mohnton, PA: when does the frost end?
Typically, the last spring freeze lands around 04/16, roughly 231 days out. Fall's first freeze usually shows up around 10/27, roughly 193 days after the last spring frost.
Mohnton 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
With roughly 9 weeks until Mohnton's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
04/16 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/03 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/30 and only about 1 year in 10 sees frost after that.
Mohnton against the rest of the dataset
Mohnton's growing season runs about 193 days, ranking 19,933 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 479 of 2,088.
Learn more
Before leaning on 19540's figures: the frost range explains how to read the range around Mohnton's dates instead of trusting one, while local microclimates explains what one yard in Mohnton can differ from the 19540 normal.