Marietta, OH 45787 Frost Dates
Marietta, OH: when does the frost end?
Typically, the last spring freeze lands around 04/23, roughly 238 days out. Fall's first freeze usually shows up around 10/22, roughly 180 days after the last spring frost.
Marietta sits in USDA Zone 6b (-5 to 0°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 Marietta's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/23 isn't a guarantee
04/23 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 05/11 and only about 1 year in 10 sees frost after that.
Marietta against the rest of the dataset
At roughly 180 frost-free days, Marietta places 24,809 of 40,283 ZIP codes in this dataset. Within OH, it ranks 785 of 1,383.
Learn more
Before leaning on 45787's figures: local microclimates explains what one yard in Marietta can differ from the 45787 normal, while zone vs. frost date explains why Zone 6b and Marietta's frost date answer different questions.