Flint, MI 48532 Frost Dates
Flint, MI: when does the frost end?
Typically, the last spring freeze lands around 05/03, roughly 248 days out. Fall's first freeze usually shows up around 10/13, roughly 162 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Flint 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
With roughly 7 weeks until Flint's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
05/03 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 05/20 and only about 1 year in 10 sees frost after that.
Flint against the rest of the dataset
Flint's growing season runs about 162 days, ranking 31,583 of 40,283 US ZIP codes measured here, longest to shortest. Within MI, it ranks 540 of 1,153.
Learn more
Before leaning on 48532's figures: local microclimates explains what one yard in Flint can differ from the 48532 normal, while zone vs. frost date explains why Zone 6a and Flint's frost date answer different questions.