New Madison, OH 45346 Frost Dates
New Madison, OH: when does the frost end?
Typically, the last spring freeze lands around 04/21, roughly 236 days out. Fall's first freeze usually shows up around 10/20, roughly 180 days after the last spring frost.
New Madison 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.
Stretching the season past the first frost
With roughly 8 weeks until New Madison's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/21 isn't a guarantee
04/21 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/07 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/07 and only about 1 year in 10 sees frost after that.
New Madison against the rest of the dataset
About 180 days separate New Madison's last and first frost, putting it 24,975 of 40,283 ZIP codes nationally. Within OH, it ranks 792 of 1,383.
Learn more
Before leaning on 45346's figures: zone vs. frost date explains why Zone 6a and New Madison's frost date answer different questions, while the frost range explains how to read the range around New Madison's dates instead of trusting one.