Hillsboro, OH 45133 Frost Dates
45133, near Hillsboro, OH: the frost window
Around 04/19 is the usual last spring frost, about 234 days away. Fall's first freeze usually shows up around 10/22, roughly 185 days after the last spring frost.
Hillsboro 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
Hillsboro'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 Hillsboro's last frost
04/19 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/05 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/06 and only about 1 year in 10 sees frost after that.
Hillsboro against the rest of the dataset
At roughly 185 frost-free days, Hillsboro places 23,130 of 40,283 ZIP codes in this dataset. Within OH, it ranks 557 of 1,383.
Learn more
Two guides worth reading on 45133: local microclimates, on what one yard in Hillsboro can differ from the 45133 normal, and zone vs. frost date, on why Zone 6b and Hillsboro's frost date answer different questions.