Darby, PA 19023 Frost Dates
When can you plant in Darby, PA?
Typically, the last spring freeze lands around 04/02, roughly 217 days out. The first fall frost typically arrives around 11/10, about 224 frost-free days later.
Darby sits in USDA Zone 7b (5 to 10°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 11 weeks of growing season left in Darby before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
How much risk comes with planting early here
04/02 is the middle of 30 years of NOAA records, not a promise. Plant by 03/19 and you're betting against frost in roughly 9 years out of 10. 04/13 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Darby compares
About 224 days separate Darby's last and first frost, putting it 11,795 of 40,283 ZIP codes nationally. Within PA, it ranks 8 of 2,088.
Learn more
zone vs. frost date covers why Zone 7b and Darby's frost date answer different questions. the frost range covers how to read the range around Darby's dates instead of trusting one.