Spring City, PA 19421 Frost Dates
19421, near Spring City, PA: the frost window
The last spring frost here typically falls around 04/11, about 226 days from today. Fall's first freeze usually shows up around 11/01, roughly 205 days after the last spring frost.
Spring City 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
Spring City'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.
Why 04/11 isn't a guarantee
04/11 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 04/29 and only about 1 year in 10 sees frost after that.
Spring City against the rest of the dataset
Spring City's growing season runs about 205 days, ranking 16,285 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 149 of 2,088.
Learn more
Two guides worth reading on 19421: zone vs. frost date, on why Zone 7a and Spring City's frost date answer different questions, and the frost range, on how to read the range around Spring City's dates instead of trusting one.