Dayton, OH 45402 Frost Dates
Dayton, OH: when does the frost end?
Typically, the last spring freeze lands around 04/16, roughly 231 days out. Fall's first freeze usually shows up around 10/28, roughly 194 days after the last spring frost.
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 Dayton, not a forecast for this year.
Stretching the season past the first frost
With roughly 9 weeks until Dayton's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
04/16 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/02 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/03 and only about 1 year in 10 sees frost after that.
Dayton against the rest of the dataset
At roughly 194 frost-free days, Dayton places 19,405 of 40,283 ZIP codes in this dataset. Within OH, it ranks 144 of 1,383.
Learn more
Before leaning on 45402's figures: zone vs. frost date explains why Zone 6b and Dayton's frost date answer different questions, while the frost range explains how to read the range around Dayton's dates instead of trusting one.