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.
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.
Shiitake Mushroom Kit
Grow your own delicious shiitake mushrooms at home.
Metal Seed Storage Box
Organized storage solution for your seed collection.
Worm Composting Kit
Complete kit for starting your own worm composting system.
Raised Garden Bed Kit
Easy-to-assemble raised garden bed for better soil control and drainage.
Seed Starting Trays
Perfect for starting seeds indoors before transplanting to your garden.
Latest MI growing zone mapThe 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.
Half zone changes from 2012 to 2023The 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!
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
Hoeing Ain't Easy Garden Sign
Fun and decorative garden sign to add personality to your space.
Metal Arbor Trellis
Decorative arbor trellis for climbing plants and garden entrance.
Cluck Around Sign
Whimsical sign for your chicken coop area.
Worm Composting Kit
Complete kit for starting your own worm composting system.
Metal Seed Storage Box
Organized storage solution for your seed collection.
Map of the Ironwood Area
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Hoeing Ain't Easy Garden Sign
Fun and decorative garden sign to add personality to your space.
Self Watering Plant Pots
Innovative pots that maintain optimal moisture levels.
Large Greenhouse Kit
Spacious greenhouse for extending your growing season.
Fiskars Garden Harvest Basket
Sturdy basket for collecting and carrying your garden harvest.
Brass Watering Can
Elegant brass watering can with classic design and durability.
Plants For Other States:
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Wooden Chicken Coop
Spacious and secure home for your backyard chickens.
Fiskars Garden Harvest Basket
Sturdy basket for collecting and carrying your garden harvest.
Reusable Grow Bags
Breathable fabric grow bags that promote healthy root growth for your vegetables and fruits.
Self Watering Plant Pots
Innovative pots that maintain optimal moisture levels.
Brass Watering Can
Elegant brass watering can with classic design and durability.
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