What Growing Zone Is Winthrop Harbor?
Our records indicate the United States Department of Agriculture has given Winthrop Harbor a growing zone designation of 6a. Sometimes also called the planting or hardiness zone, this zone number gives you an idea of what plants can and cannot grow in Winthrop Harbor's climate based on the average extreme annual temperature.Our data is based on the latest 2023 USDA maps, which used Winthrop Harbor's weather data from 1991 - 2020 in their analysis.
Latest IL growing zone mapIf you are looking for plants suitable for growing in the Winthrop Harbor area, head on over to our page on plants that grow well in Winthrop Harbor, IL.
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Latest IL 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 Winthrop Harbor is in growing zone 6a this means that plants there can survive temperatures as low as -10 to -5 degrees Fahrenheit. Plants for Winthrop Harbor'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 Winthrop Harbor 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!
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 Winthrop Harbor, IL.
The USDA hardiness zone is 6a for Winthrop Harbor. This is sometimes also referred to as the growing or planting zone. These terms are used interchangeably.
Winthrop Harbor's Growing Zone Details
USDA Growing Zone: 6a
Zip Codes: 60096
Longitude: -87.8293
Latitude: 42.4805
Lowest Avg Temperatures (F): -10 to -5
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Map of the Winthrop Harbor Area
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Plants For Other States
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Shiitake Mushroom Kit
Grow your own delicious shiitake mushrooms at home.
Seed Starting Trays
Perfect for starting seeds indoors before transplanting to your garden.
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Innovative pots that maintain optimal moisture levels.
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