What Growing Zone Is Ironwood?

Our records indicate the United States Department of Agriculture has given Ironwood a growing zone designation of 4b. Sometimes also called the planting or hardiness zone, this zone number gives you an idea of what plants can and cannot grow in Ironwood's climate based on the average extreme annual temperature.Our data is based on the latest 2023 USDA maps, which used Ironwood's weather data from 1991 - 2020 in their analysis.

Latest MI growing zone map

If you are looking for plants suitable for growing in the Ironwood area, head on over to our page on plants that grow well in Ironwood, MI.

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Latest MI growing zone map

The growing zone is a measure of the lowest temperature that a plant can survive based on average lowest year temperatures, helping you to decide what plants would grow best in your particular climate. Since Ironwood is in growing zone 4b this means that plants there can survive temperatures as low as -25 to -20 degrees Fahrenheit. Plants for Ironwood's climate should be chosen with this in mind, or plants should be moved inside to keep their core temperature in the right range if necessary.

Some zones may have been changed by the USDA as of 2023. To see if the Ironwood area has been affected, refer to this map of half zone changes from the 2012 version of the USDA zones to the 2023 version.

The updated map shows that over half of the Southeast has warmed by about half a zone. For gardeners, that means you can now grow plants that tolerate a bit more heat and less frost than before. The tan areas reflect this shift. Meanwhile, the white areas had slight temperature changes, but not enough to move them into a new zone. In the Western U.S., a few spots shifted cooler. That’s not due to a colder climate, but because the new map uses a larger dataset, giving a more accurate picture of local conditions. It's important to keep track of these changes when planning your garden!

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Hardiness Zone FAQ

Have questions about hardiness zones and what they mean for your garden? Check out our FAQ below for quick answers to common questions about USDA hardiness zones and how they affect plant selection in Ironwood, MI.

The USDA hardiness zone is 4b for Ironwood. This is sometimes also referred to as the growing or planting zone. These terms are used interchangeably.

Ironwood's Growing Zone Details

USDA Growing Zone: 4b

Zip Codes:

49938

Longitude: -90.1505

Latitude: 46.4522

Lowest Avg Temperatures (F): -25 to -20

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Map of the Ironwood Area

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Plants For Other States

Looking for the best plants in a different area of the United States? Click on a button below to find plants that are ideal for that state's temperatures.