Mariemont, OH 45227 Frost Dates
45227, near Mariemont, 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 Mariemont, not a forecast for this year.
Stretching the season past the first frost
Mariemont'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.
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.
Mariemont against the rest of the dataset
About 190 days separate Mariemont's last and first frost, putting it 21,166 of 40,283 ZIP codes nationally. Within OH, it ranks 327 of 1,383.
Learn more
Two guides worth reading on 45227: zone vs. frost date, on why Zone 6b and Mariemont's frost date answer different questions, and the frost range, on how to read the range around Mariemont's dates instead of trusting one.