St. Charles, MI 48614 Frost Dates
48614, near St. Charles, 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 164 days after the last spring frost.
St. Charles 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
St. Charles'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 St. Charles'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 05/17 and only about 1 year in 10 sees frost after that.
St. Charles against the rest of the dataset
At roughly 164 frost-free days, St. Charles places 31,001 of 40,283 ZIP codes in this dataset. Within MI, it ranks 488 of 1,153.
Learn more
Two guides worth reading on 48614: local microclimates, on what one yard in St. Charles can differ from the 48614 normal, and zone vs. frost date, on why Zone 6a and St. Charles's frost date answer different questions.