Jefferson, PA 15344 Frost Dates
Frost dates for Jefferson, PA, ZIP 15344
The last spring frost here typically falls around 05/03, about 248 days from today. The first fall frost typically arrives around 10/15, about 164 frost-free days later.
The USDA Plant Hardiness Zone Map puts Jefferson in Zone 6b (-5 to 0°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
Zone 6b around Jefferson has about 7 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.
The actual range around Jefferson's last frost
05/03 is the middle of 30 years of NOAA records, not a promise. Plant by 04/19 and you're betting against frost in roughly 9 years out of 10. 05/21 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Jefferson compares
Jefferson's growing season runs about 164 days, ranking 31,202 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 1,627 of 2,088.
Learn more
the frost range explains how to read the range around Jefferson's dates instead of trusting one, and local microclimates explains what one yard in Jefferson can differ from the 15344 normal.