Butler, PA 16039 Frost Dates
Frost dates for Butler, PA, ZIP 16039
Typically, the last spring freeze lands around 04/16, roughly 231 days out. The first fall frost typically arrives around 11/02, about 199 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 Butler, not a forecast for this year.
What to do before the first frost
Zone 6b around Butler has about 9 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.
How much risk comes with planting early here
04/16 is the middle of 30 years of NOAA records, not a promise. Plant by 03/31 and you're betting against frost in roughly 9 years out of 10. 05/02 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Butler compares
At roughly 199 frost-free days, Butler places 18,060 of 40,283 ZIP codes in this dataset. Within PA, it ranks 289 of 2,088.
Learn more
local microclimates explains what one yard in Butler can differ from the 16039 normal, and zone vs. frost date explains why Zone 6b and Butler's frost date answer different questions.