Denver, PA 17578 Frost Dates
17578, near Denver, PA: the frost window
Typically, the last spring freeze lands around 04/18, roughly 233 days out. Fall's first freeze usually shows up around 10/25, roughly 186 days after the last spring frost.
Denver 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
Denver'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
04/18 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 05/05 and only about 1 year in 10 sees frost after that.
Denver against the rest of the dataset
About 186 days separate Denver's last and first frost, putting it 22,803 of 40,283 ZIP codes nationally. Within PA, it ranks 667 of 2,088.
Learn more
Two guides worth reading on 17578: zone vs. frost date, on why Zone 7a and Denver's frost date answer different questions, and the frost range, on how to read the range around Denver's dates instead of trusting one.