Mackinaw City, MI 49701 Frost Dates
Frost dates for Mackinaw City, MI, ZIP 49701
Typically, the last spring freeze lands around 05/07, roughly 252 days out. The first fall frost typically arrives around 10/23, about 167 frost-free days later.
Zone 5b (-15 to -10°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 Mackinaw City, not a forecast for this year.
What to do before the first frost
Zone 5b around Mackinaw City has about 8 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
How much risk comes with planting early here
05/07 is the middle of 30 years of NOAA records, not a promise. Plant by 04/25 and you're betting against frost in roughly 9 years out of 10. 05/22 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Mackinaw City compares
At roughly 167 frost-free days, Mackinaw City places 30,099 of 40,283 ZIP codes in this dataset. Within MI, it ranks 372 of 1,153.
Learn more
the frost range explains how to read the range around Mackinaw City's dates instead of trusting one, and local microclimates explains what one yard in Mackinaw City can differ from the 49701 normal.