Flint, MI 48552 Frost Dates
48552, near Flint, MI: the frost window
Around 05/06 is the usual last spring frost, about 251 days away. Fall's first freeze usually shows up around 10/10, roughly 155 days after the last spring frost.
Zone 6a (-10 to -5°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Flint, not a forecast for this year.
Stretching the season past the first frost
Flint'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 Flint's last frost
05/06 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 05/23 and only about 1 year in 10 sees frost after that.
Flint against the rest of the dataset
At roughly 155 frost-free days, Flint places 33,906 of 40,283 ZIP codes in this dataset. Within MI, it ranks 770 of 1,153.
Learn more
Two guides worth reading on 48552: local microclimates, on what one yard in Flint can differ from the 48552 normal, and zone vs. frost date, on why Zone 6a and Flint's frost date answer different questions.