Manistique, MI 49840 Frost Dates
49840, near Manistique, MI: the frost window
The last spring frost here typically falls around 05/09, about 254 days from today. Fall's first freeze usually shows up around 10/10, roughly 154 days after the last spring frost.
Zone 5a (-20 to -15°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Manistique, not a forecast for this year.
Stretching the season past the first frost
Manistique'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.
The actual range around Manistique's last frost
05/09 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/27 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.
Manistique against the rest of the dataset
About 154 days separate Manistique's last and first frost, putting it 34,323 of 40,283 ZIP codes nationally. Within MI, it ranks 790 of 1,153.
Learn more
Two guides worth reading on 49840: the frost range, on how to read the range around Manistique's dates instead of trusting one, and local microclimates, on what one yard in Manistique can differ from the 49840 normal.