Indianapolis, IN 46207 Frost Dates
Indianapolis, IN: when does the frost end?
Around 04/20 is the usual last spring frost, about 235 days away. Fall's first freeze usually shows up around 10/21, roughly 183 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Indianapolis in Zone 6b (-5 to 0°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 8 weeks until Indianapolis's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Indianapolis's last frost
04/20 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/06 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/05 and only about 1 year in 10 sees frost after that.
Indianapolis against the rest of the dataset
About 183 days separate Indianapolis's last and first frost, putting it 23,705 of 40,283 ZIP codes nationally. Within IN, it ranks 397 of 927.
Learn more
Before leaning on 46207's figures: local microclimates explains what one yard in Indianapolis can differ from the 46207 normal, while zone vs. frost date explains why Zone 6b and Indianapolis's frost date answer different questions.