Portsmouth, OH 45662 Frost Dates
Portsmouth, OH: when does the frost end?
The last spring frost here typically falls around 04/17, about 232 days from today. Fall's first freeze usually shows up around 10/25, roughly 191 days after the last spring frost.
Zone 7a (0 to 5°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 Portsmouth, not a forecast for this year.
Stretching the season past the first frost
With roughly 8 weeks until Portsmouth'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
04/17 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/03 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/05 and only about 1 year in 10 sees frost after that.
Portsmouth against the rest of the dataset
At roughly 191 frost-free days, Portsmouth places 20,725 of 40,283 ZIP codes in this dataset. Within OH, it ranks 285 of 1,383.
Learn more
Before leaning on 45662's figures: local microclimates explains what one yard in Portsmouth can differ from the 45662 normal, while zone vs. frost date explains why Zone 7a and Portsmouth's frost date answer different questions.