Mount Ayr, IN 47964 Frost Dates
Mount Ayr, IN: when does the frost end?
Around 04/23 is the usual last spring frost, about 238 days away. Fall's first freeze usually shows up around 10/18, roughly 177 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 Mount Ayr, not a forecast for this year.
Stretching the season past the first frost
With roughly 7 weeks until Mount Ayr's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Mount Ayr's last frost
04/23 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/09 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/07 and only about 1 year in 10 sees frost after that.
Mount Ayr against the rest of the dataset
At roughly 177 frost-free days, Mount Ayr places 26,300 of 40,283 ZIP codes in this dataset. Within IN, it ranks 617 of 927.
Learn more
Before leaning on 47964's figures: zone vs. frost date explains why Zone 6a and Mount Ayr's frost date answer different questions, while the frost range explains how to read the range around Mount Ayr's dates instead of trusting one.