Mattawan, MI 49071 Frost Dates
Frost dates for Mattawan, MI, ZIP 49071
Around 05/07 is the usual last spring frost, about 252 days away. The first fall frost typically arrives around 10/11, about 156 frost-free days later.
The USDA Plant Hardiness Zone Map puts Mattawan in Zone 6a (-10 to -5°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 6a around Mattawan has about 6 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.
Why 05/07 isn't a guarantee
05/07 is the middle of 30 years of NOAA records, not a promise. Plant by 04/23 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 Mattawan compares
At roughly 156 frost-free days, Mattawan places 33,628 of 40,283 ZIP codes in this dataset. Within MI, it ranks 744 of 1,153.
Learn more
the frost range explains how to read the range around Mattawan's dates instead of trusting one, and local microclimates explains what one yard in Mattawan can differ from the 49071 normal.