Glen Rock, PA 17327 Frost Dates
17327, near Glen Rock, PA: the frost window
Typically, the last spring freeze lands around 04/19, roughly 234 days out. Fall's first freeze usually shows up around 10/25, roughly 188 days after the last spring frost.
Glen Rock 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
Glen Rock'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.
Why 04/19 isn't a guarantee
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.
Glen Rock against the rest of the dataset
Glen Rock's growing season runs about 188 days, ranking 22,075 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 588 of 2,088.
Learn more
Two guides worth reading on 17327: the frost range, on how to read the range around Glen Rock's dates instead of trusting one, and local microclimates, on what one yard in Glen Rock can differ from the 17327 normal.