Corunna, IN 46730 Frost Dates
Corunna, IN: when does the frost end?
Typically, the last spring freeze lands around 05/02, roughly 247 days out. Fall's first freeze usually shows up around 10/10, roughly 159 days after the last spring frost.
Zone 6a (-10 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 Corunna, not a forecast for this year.
Stretching the season past the first frost
With roughly 6 weeks until Corunna's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 05/02 isn't a guarantee
05/02 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/19 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.
Corunna against the rest of the dataset
Corunna's growing season runs about 159 days, ranking 32,779 of 40,283 US ZIP codes measured here, longest to shortest. Within IN, it ranks 927 of 927.
Learn more
Before leaning on 46730's figures: local microclimates explains what one yard in Corunna can differ from the 46730 normal, while zone vs. frost date explains why Zone 6a and Corunna's frost date answer different questions.