Detroit's zone didn't change from the 2012 map, remaining Zone 6b, an extreme minimum winter temperature of minus 5 degrees to zero. But the 6b zone expanded farther north into the Detroit suburbs ...

The USDA divides the United States into seven planting regions, known as hardiness zones, which were most recently updated in 2023. The maps below show these planting regions. Need a break? Play ...

This describes a plant’s cold tolerance. The zone map is updated once every 10 years to reflect changes in climate and most of our area is now considered half a zone warmer.