Napoleon, OH 43545 Frost Dates
When can you plant in Napoleon, OH?
Typically, the last spring freeze lands around 04/28, roughly 243 days out. The first fall frost typically arrives around 10/17, about 170 frost-free days later.
Napoleon 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
About 7 weeks of growing season left in Napoleon before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 04/28 isn't a guarantee
04/28 is the middle of 30 years of NOAA records, not a promise. Plant by 04/13 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 Napoleon compares
About 170 days separate Napoleon's last and first frost, putting it 28,949 of 40,283 ZIP codes nationally. Within OH, it ranks 1,153 of 1,383.
Learn more
zone vs. frost date covers why Zone 6a and Napoleon's frost date answer different questions. the frost range covers how to read the range around Napoleon's dates instead of trusting one.