North Irwin, PA 15615 Frost Dates
When can you plant in North Irwin, PA?
The last spring frost here typically falls around 05/02, about 247 days from today. The first fall frost typically arrives around 10/20, about 170 frost-free days later.
Zone 6b (-5 to 0°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 North Irwin, not a forecast for this year.
What to do before the first frost
About 8 weeks of growing season left in North Irwin before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around North Irwin's last frost
05/02 is the middle of 30 years of NOAA records, not a promise. Plant by 04/17 and you're betting against frost in roughly 9 years out of 10. 05/20 is the safer bet, historically only a 1-in-10 chance of frost that late.
How North Irwin compares
About 170 days separate North Irwin's last and first frost, putting it 29,143 of 40,283 ZIP codes nationally. Within PA, it ranks 1,497 of 2,088.
Learn more
zone vs. frost date covers why Zone 6b and North Irwin's frost date answer different questions. the frost range covers how to read the range around North Irwin's dates instead of trusting one.