Shrewsbury, PA 17361 Frost Dates
17361, near Shrewsbury, PA: the frost window
The last spring frost here typically falls around 04/19, about 234 days from today. Fall's first freeze usually shows up around 10/25, roughly 188 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Shrewsbury 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
Shrewsbury's growing season runs out in roughly 8 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
04/19 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/04 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/08 and only about 1 year in 10 sees frost after that.
Shrewsbury against the rest of the dataset
Shrewsbury's growing season runs about 188 days, ranking 22,036 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 582 of 2,088.
Learn more
Two guides worth reading on 17361: the frost range, on how to read the range around Shrewsbury's dates instead of trusting one, and local microclimates, on what one yard in Shrewsbury can differ from the 17361 normal.