Hummelstown, PA 17036 Frost Dates
17036, near Hummelstown, 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 11/02, roughly 206 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Hummelstown 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
Hummelstown'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.
The actual range around Hummelstown's last frost
04/09 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/28 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.
Hummelstown against the rest of the dataset
About 206 days separate Hummelstown's last and first frost, putting it 16,007 of 40,283 ZIP codes nationally. Within PA, it ranks 105 of 2,088.
Learn more
Two guides worth reading on 17036: the frost range, on how to read the range around Hummelstown's dates instead of trusting one, and local microclimates, on what one yard in Hummelstown can differ from the 17036 normal.