Cincinnati, OH 45225 Frost Dates
45225, near Cincinnati, OH: the frost window
The last spring frost here typically falls around 04/16, about 231 days from today. Fall's first freeze usually shows up around 10/25, roughly 190 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 Cincinnati, not a forecast for this year.
Stretching the season past the first frost
Cincinnati's growing season runs out in roughly 8 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Cincinnati's last frost
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.
Cincinnati against the rest of the dataset
Cincinnati's growing season runs about 190 days, ranking 20,964 of 40,283 US ZIP codes measured here, longest to shortest. Within OH, it ranks 308 of 1,383.
Learn more
Two guides worth reading on 45225: the frost range, on how to read the range around Cincinnati's dates instead of trusting one, and local microclimates, on what one yard in Cincinnati can differ from the 45225 normal.