A hardiness zone is a geographic area with a similar average minimum temperature. The map is based on the average annual extreme minimum temperature, so people in those areas know which plants can ...

The USDA's plant hardiness zone map was updated in 2023 ... "Based on our maps, that means that this particular tree can tolerate extreme cold temperatures down to around -20 degrees Fahrenheit ...

Here's which planting region Wisconsin falls in and how to look up the plant hardiness in your zip code. Trouble seeing the map? Click here to view the planting zones for the North Central U.S ...

However, average minimum temperatures vary widely from south to north Wisconsin, meaning plants that may do well in Milwaukee ...