Coloma, MI 49038 Frost Dates
49038, near Coloma, MI: the frost window
Around 05/05 is the usual last spring frost, about 250 days away. Fall's first freeze usually shows up around 10/15, roughly 161 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Coloma 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
Coloma's growing season runs out in roughly 7 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 05/05 isn't a guarantee
05/05 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/20 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/26 and only about 1 year in 10 sees frost after that.
Coloma against the rest of the dataset
At roughly 161 frost-free days, Coloma places 32,081 of 40,283 ZIP codes in this dataset. Within MI, it ranks 582 of 1,153.
Learn more
Two guides worth reading on 49038: zone vs. frost date, on why Zone 6b and Coloma's frost date answer different questions, and the frost range, on how to read the range around Coloma's dates instead of trusting one.