Dunbar, PA 15465 Frost Dates
Frost dates for Dunbar, PA, ZIP 15465
Around 04/28 is the usual last spring frost, about 243 days away. The first fall frost typically arrives around 10/21, about 175 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 Dunbar, not a forecast for this year.
What to do before the first frost
Zone 6b around Dunbar has about 8 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.
Why 04/28 isn't a guarantee
04/28 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. 05/14 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Dunbar compares
Dunbar's growing season runs about 175 days, ranking 27,088 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 1,219 of 2,088.
Learn more
the frost range explains how to read the range around Dunbar's dates instead of trusting one, and local microclimates explains what one yard in Dunbar can differ from the 15465 normal.