Helena, OH 43435 Frost Dates
43435, near Helena, OH: the frost window
Around 04/21 is the usual last spring frost, about 236 days away. Fall's first freeze usually shows up around 10/24, roughly 183 days after the last spring frost.
Helena 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
Helena'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 Helena's last frost
04/21 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/08 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.
Helena against the rest of the dataset
About 183 days separate Helena's last and first frost, putting it 24,025 of 40,283 ZIP codes nationally. Within OH, it ranks 716 of 1,383.
Learn more
Two guides worth reading on 43435: the frost range, on how to read the range around Helena's dates instead of trusting one, and local microclimates, on what one yard in Helena can differ from the 43435 normal.