The zones, according to Michigan State University, are divided mostly into 10-degree increments with the coldest zone, zone 1, in northern Alaska and the warmest zone, zone 13, in Hawaii and ...

The zones, according to Michigan State University, are divided mostly into 10-degree increments with the coldest zone, zone 1, in northern Alaska and the warmest zone, zone 13, in Hawaii and ...

Michigan is home to seven of the 26 half zones, starting as low as minus 30 to minus 25 degrees and topping out at 0 to 5 degrees. Below is a map by zip code of the plant hardiness zones in Michigan.

Weather Why Here's Why: Planting Zones Are Shifting In The U.S. Planting zones have been shifting across the United States in recent decades. Meteorologist Michael Behrens explains why.

The image above shows the USDA hardiness zones during the period of 1971-2000. Next we can compare the hardiness zones to the latest update from the USDA. The latest update was issued after 2010.