Michigan climate almanac
Michigan's climate, read through its 70 NOAA stations, is mainly mild humid continental (northeast, midwest, pacific northwest), then cold continental (upper midwest, rocky mountains). The mean frost-free season runs from about May 12 to October 10, roughly 147 days.
Stations 70 NOAA 1991-2020 normals
Mean frost-free season 147 days 94 to 196 across the state
Typical frost window May 12 - October 10 Median last and first frost
Main climate types 2 Mild humid continental (Northeast, Midwest, Pacific Northwest) (35); Cold continental (Upper Midwest, Rocky Mountains) (35)
What this means for your home
In Michigan, the difference between the shortest and longest frost-free pockets is 102 days. That is the difference between a tomato crop that struggles and one that runs into October, between one fertilizer timing and another. Set your place above to tune every date to your nearest station.
Major cities in Michigan
Pick a city to see its frost and planting dates, or set your own place above.