Northampton, PA 18099 Frost Dates
Frost dates for Northampton, PA, ZIP 18099
The last spring frost here typically falls around 04/20, about 235 days from today. The first fall frost typically arrives around 10/24, about 184 frost-free days later.
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.
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
Northampton's growing season runs about 184 days, ranking 23,474 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 767 of 2,088.
Learn more
the frost range explains how to read the range around Northampton's dates instead of trusting one, and local microclimates explains what one yard in Northampton can differ from the 18099 normal.