Rio Grande, OH 45674 Frost Dates
45674, near Rio Grande, OH: the frost window
Typically, the last spring freeze lands around 04/30, roughly 245 days out. Fall's first freeze usually shows up around 10/15, roughly 167 days after the last spring frost.
Rio Grande 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
Rio Grande's growing season runs out in roughly 7 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 Rio Grande's last frost
04/30 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/15 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/16 and only about 1 year in 10 sees frost after that.
Rio Grande against the rest of the dataset
Rio Grande's growing season runs about 167 days, ranking 30,112 of 40,283 US ZIP codes measured here, longest to shortest. Within OH, it ranks 1,314 of 1,383.
Learn more
Two guides worth reading on 45674: local microclimates, on what one yard in Rio Grande can differ from the 45674 normal, and zone vs. frost date, on why Zone 6b and Rio Grande's frost date answer different questions.