Northampton, PA 18059 Frost Dates
Frost dates for Northampton, PA, ZIP 18059
Around 04/20 is the usual last spring frost, about 235 days away. The first fall frost typically arrives around 10/24, about 184 frost-free days later.
Northampton 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.
What to do before the first frost
Zone 7a around Northampton has about 8 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
Why 04/20 isn't a guarantee
04/20 is the middle of 30 years of NOAA records, not a promise. Plant by 04/06 and you're betting against frost in roughly 9 years out of 10. 05/06 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Northampton compares
At roughly 184 frost-free days, Northampton places 23,470 of 40,283 ZIP codes in this dataset. Within PA, it ranks 763 of 2,088.
Learn more
local microclimates explains what one yard in Northampton can differ from the 18059 normal, and zone vs. frost date explains why Zone 7a and Northampton's frost date answer different questions.