Chalfont, PA 18914 Frost Dates
18914, near Chalfont, PA: the frost window
Around 04/13 is the usual last spring frost, about 228 days away. Fall's first freeze usually shows up around 10/30, roughly 198 days after the last spring frost.
Chalfont 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
Chalfont'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 04/13 isn't a guarantee
04/13 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/01 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/27 and only about 1 year in 10 sees frost after that.
Chalfont against the rest of the dataset
About 198 days separate Chalfont's last and first frost, putting it 18,429 of 40,283 ZIP codes nationally. Within PA, it ranks 346 of 2,088.
Learn more
Two guides worth reading on 18914: the frost range, on how to read the range around Chalfont's dates instead of trusting one, and local microclimates, on what one yard in Chalfont can differ from the 18914 normal.