Port Jefferson, OH 45340 Frost Dates
45340, near Port Jefferson, OH: the frost window
The last spring frost here typically falls around 04/27, about 242 days from today. Fall's first freeze usually shows up around 10/20, roughly 175 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Port Jefferson in Zone 6a (-10 to -5°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
Port Jefferson'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 Port Jefferson's last frost
04/27 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/12 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/12 and only about 1 year in 10 sees frost after that.
Port Jefferson against the rest of the dataset
Port Jefferson's growing season runs about 175 days, ranking 27,222 of 40,283 US ZIP codes measured here, longest to shortest. Within OH, it ranks 1,074 of 1,383.
Learn more
Two guides worth reading on 45340: the frost range, on how to read the range around Port Jefferson's dates instead of trusting one, and local microclimates, on what one yard in Port Jefferson can differ from the 45340 normal.