Northampton, PA 18067 Frost Dates
18067, near Northampton, PA: the frost window
Around 04/20 is the usual last spring frost, about 235 days away. Fall's first freeze usually shows up around 10/24, roughly 184 days after the last spring frost.
Zone 7a (0 to 5°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Northampton, not a forecast for this year.
Stretching the season past the first frost
Northampton'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 04/20 isn't a guarantee
04/20 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/06 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/06 and only about 1 year in 10 sees frost after that.
Northampton against the rest of the dataset
Northampton's growing season runs about 184 days, ranking 23,471 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 764 of 2,088.
Learn more
Two guides worth reading on 18067: local microclimates, on what one yard in Northampton can differ from the 18067 normal, and zone vs. frost date, on why Zone 7a and Northampton's frost date answer different questions.