Bluffton, OH 45817 Frost Dates
Frost dates for Bluffton, OH, ZIP 45817
Around 04/22 is the usual last spring frost, about 237 days away. The first fall frost typically arrives around 10/22, about 181 frost-free days later.
Bluffton sits in USDA Zone 6a (-10 to -5°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 6a around Bluffton 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.
How much risk comes with planting early here
04/22 is the middle of 30 years of NOAA records, not a promise. Plant by 04/07 and you're betting against frost in roughly 9 years out of 10. 05/07 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Bluffton compares
At roughly 181 frost-free days, Bluffton places 24,531 of 40,283 ZIP codes in this dataset. Within OH, it ranks 764 of 1,383.
Learn more
local microclimates explains what one yard in Bluffton can differ from the 45817 normal, and zone vs. frost date explains why Zone 6a and Bluffton's frost date answer different questions.