Carmel, IN 46280 Frost Dates
46280, near Carmel, IN: the frost window
The last spring frost here typically falls around 04/18, about 233 days from today. Fall's first freeze usually shows up around 10/26, roughly 190 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Carmel in Zone 6a (-10 to -5°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
Carmel'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.
Why 04/18 isn't a guarantee
04/18 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/03 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.
Carmel against the rest of the dataset
At roughly 190 frost-free days, Carmel places 20,974 of 40,283 ZIP codes in this dataset. Within IN, it ranks 250 of 927.
Learn more
Two guides worth reading on 46280: local microclimates, on what one yard in Carmel can differ from the 46280 normal, and zone vs. frost date, on why Zone 6a and Carmel's frost date answer different questions.