Frankenmuth, MI 48734 Frost Dates
48734, near Frankenmuth, MI: the frost window
Typically, the last spring freeze lands around 05/03, roughly 248 days out. Fall's first freeze usually shows up around 10/12, roughly 161 days after the last spring frost.
Frankenmuth 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
Frankenmuth's growing season runs out in roughly 6 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 05/03 isn't a guarantee
05/03 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/19 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.
Frankenmuth against the rest of the dataset
About 161 days separate Frankenmuth's last and first frost, putting it 32,026 of 40,283 ZIP codes nationally. Within MI, it ranks 567 of 1,153.
Learn more
Two guides worth reading on 48734: the frost range, on how to read the range around Frankenmuth's dates instead of trusting one, and local microclimates, on what one yard in Frankenmuth can differ from the 48734 normal.