Milan, MI 48190 Frost Dates
48190, near Milan, MI: the frost window
Around 05/03 is the usual last spring frost, about 248 days away. Fall's first freeze usually shows up around 10/10, roughly 158 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Milan 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
Milan's growing season runs out in roughly 6 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 05/03 isn't a guarantee
05/03 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/17 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/25 and only about 1 year in 10 sees frost after that.
Milan against the rest of the dataset
Milan's growing season runs about 158 days, ranking 32,960 of 40,283 US ZIP codes measured here, longest to shortest. Within MI, it ranks 661 of 1,153.
Learn more
Two guides worth reading on 48190: the frost range, on how to read the range around Milan's dates instead of trusting one, and local microclimates, on what one yard in Milan can differ from the 48190 normal.