Sunbury, PA 17801 Frost Dates
Frost dates for Sunbury, PA, ZIP 17801
The last spring frost here typically falls around 04/30, about 245 days from today. The first fall frost typically arrives around 10/13, about 166 frost-free days later.
Sunbury sits in USDA Zone 6b (-5 to 0°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
Zone 6b around Sunbury 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.
Why 04/30 isn't a guarantee
04/30 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. 05/19 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Sunbury compares
About 166 days separate Sunbury's last and first frost, putting it 30,319 of 40,283 ZIP codes nationally. Within PA, it ranks 1,528 of 2,088.
Learn more
local microclimates explains what one yard in Sunbury can differ from the 17801 normal, and zone vs. frost date explains why Zone 6b and Sunbury's frost date answer different questions.