Three Rivers, MI 49093 Frost Dates
49093, near Three Rivers, MI: the frost window
Around 05/04 is the usual last spring frost, about 249 days away. Fall's first freeze usually shows up around 10/11, roughly 158 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Three Rivers 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
Three Rivers'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.
The actual range around Three Rivers's last frost
05/04 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/21 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/22 and only about 1 year in 10 sees frost after that.
Three Rivers against the rest of the dataset
Three Rivers's growing season runs about 158 days, ranking 32,954 of 40,283 US ZIP codes measured here, longest to shortest. Within MI, it ranks 659 of 1,153.
Learn more
Two guides worth reading on 49093: local microclimates, on what one yard in Three Rivers can differ from the 49093 normal, and zone vs. frost date, on why Zone 6a and Three Rivers's frost date answer different questions.