Croswell, MI 48422 Frost Dates
48422, near Croswell, MI: the frost window
Typically, the last spring freeze lands around 05/04, roughly 249 days out. Fall's first freeze usually shows up around 10/24, roughly 171 days after the last spring frost.
Croswell sits in USDA Zone 6a (-10 to -5°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
Croswell's growing season runs out in roughly 8 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
05/04 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.
Croswell against the rest of the dataset
Croswell's growing season runs about 171 days, ranking 28,678 of 40,283 US ZIP codes measured here, longest to shortest. Within MI, it ranks 290 of 1,153.
Learn more
Two guides worth reading on 48422: local microclimates, on what one yard in Croswell can differ from the 48422 normal, and zone vs. frost date, on why Zone 6a and Croswell's frost date answer different questions.