Northampton, PA 18109 Frost Dates
When can you plant in Northampton, PA?
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.
The USDA Plant Hardiness Zone Map puts Northampton in Zone 7a (0 to 5°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
About 8 weeks of growing season left in Northampton before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Northampton's last frost
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 23,476 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 769 of 2,088.
Learn more
local microclimates covers what one yard in Northampton can differ from the 18109 normal. zone vs. frost date covers why Zone 7a and Northampton's frost date answer different questions.