Ecorse, MI 48121 Frost Dates
48121, near Ecorse, MI: the frost window
Typically, the last spring freeze lands around 05/01, roughly 246 days out. Fall's first freeze usually shows up around 10/15, roughly 166 days after the last spring frost.
Ecorse sits in USDA Zone 6b (-5 to 0°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
Ecorse'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.
The actual range around Ecorse's last frost
05/01 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/17 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/18 and only about 1 year in 10 sees frost after that.
Ecorse against the rest of the dataset
At roughly 166 frost-free days, Ecorse places 30,324 of 40,283 ZIP codes in this dataset. Within MI, it ranks 392 of 1,153.
Learn more
Two guides worth reading on 48121: local microclimates, on what one yard in Ecorse can differ from the 48121 normal, and zone vs. frost date, on why Zone 6b and Ecorse's frost date answer different questions.