Lake Ann, MI 49643 Frost Dates
49643, near Lake Ann, MI: the frost window
Typically, the last spring freeze lands around 05/09, roughly 254 days out. Fall's first freeze usually shows up around 10/15, roughly 156 days after the last spring frost.
Lake Ann 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
Lake Ann'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.
How much risk comes with planting early here
05/09 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/26 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/23 and only about 1 year in 10 sees frost after that.
Lake Ann against the rest of the dataset
At roughly 156 frost-free days, Lake Ann places 33,834 of 40,283 ZIP codes in this dataset. Within MI, it ranks 761 of 1,153.
Learn more
Two guides worth reading on 49643: zone vs. frost date, on why Zone 6a and Lake Ann's frost date answer different questions, and the frost range, on how to read the range around Lake Ann's dates instead of trusting one.