Detroit, MI 48204 Frost Dates
Detroit, MI: when does the frost end?
Around 04/27 is the usual last spring frost, about 242 days away. Fall's first freeze usually shows up around 10/25, roughly 181 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Detroit 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
With roughly 8 weeks until Detroit's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Detroit's last frost
04/27 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/12 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/11 and only about 1 year in 10 sees frost after that.
Detroit against the rest of the dataset
About 181 days separate Detroit's last and first frost, putting it 24,366 of 40,283 ZIP codes nationally. Within MI, it ranks 66 of 1,153.
Learn more
Before leaning on 48204's figures: the frost range explains how to read the range around Detroit's dates instead of trusting one, while local microclimates explains what one yard in Detroit can differ from the 48204 normal.