Mountville, PA 17582 Frost Dates
17582, near Mountville, PA: the frost window
Around 04/30 is the usual last spring frost, about 245 days away. Fall's first freeze usually shows up around 10/10, roughly 162 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Mountville in Zone 7a (0 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
Mountville's growing season runs out in roughly 6 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 04/30 isn't a guarantee
04/30 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/16 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/13 and only about 1 year in 10 sees frost after that.
Mountville against the rest of the dataset
About 162 days separate Mountville's last and first frost, putting it 31,737 of 40,283 ZIP codes nationally. Within PA, it ranks 1,660 of 2,088.
Learn more
Two guides worth reading on 17582: local microclimates, on what one yard in Mountville can differ from the 17582 normal, and zone vs. frost date, on why Zone 7a and Mountville's frost date answer different questions.