Northumberland, PA 17857 Frost Dates
When can you plant in Northumberland, PA?
Around 04/30 is the usual last spring frost, about 245 days away. The first fall frost typically arrives around 10/13, about 166 frost-free days later.
Northumberland sits in USDA Zone 6b (-5 to 0°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
About 7 weeks of growing season left in Northumberland before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Northumberland's last frost
04/30 is the middle of 30 years of NOAA records, not a promise. Plant by 04/15 and you're betting against frost in roughly 9 years out of 10. 05/19 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Northumberland compares
Northumberland's growing season runs about 166 days, ranking 30,371 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 1,531 of 2,088.
Learn more
zone vs. frost date covers why Zone 6b and Northumberland's frost date answer different questions. the frost range covers how to read the range around Northumberland's dates instead of trusting one.