Colwyn, PA 19153 Frost Dates
When can you plant in Colwyn, PA?
The last spring frost here typically falls around 04/02, about 217 days from today. The first fall frost typically arrives around 11/10, about 224 frost-free days later.
Zone 7b (5 to 10°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 Colwyn, not a forecast for this year.
What to do before the first frost
About 11 weeks of growing season left in Colwyn 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 Colwyn compares
About 224 days separate Colwyn's last and first frost, putting it 11,892 of 40,283 ZIP codes nationally. Within PA, it ranks 37 of 2,088.
Learn more
the frost range covers how to read the range around Colwyn's dates instead of trusting one. local microclimates covers what one yard in Colwyn can differ from the 19153 normal.