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Gardeners Need to Adjust as Hardiness Zones Shift in Wisconsin
Wisconsin Ag Connection - 04/19/2024

Most growers rely on a map from the United States Department of Agriculture (USDA) which are known as 'Hardiness Zones'.

It’s a data driven map that tells which plants grow better than others depending on the temperatures, and there have been some big shifts over the past decade.

The map gives us the coldest temperatures every year to let us know which plants will be hardy enough to survive it.

The eastern side of the state saw big changes along Lake Michigan in the Milwaukee and Kenosha areas.

Closer to home here in Central Wisconsin we're not out of the weeds either, especially along the Wisconsin River.

Some plants that historically have grown well in the area can't survive the temperature shift anymore, while others may be able to thrive

Janell Wehr, a Horticulture Educator in Marathon and Wood County said, "The area along the Wisconsin River between Stevens Point and Wausau, that's now showing as a 5A where before it was a 4B. Zone three virtually disappeared from Wisconsin. There's a couple spots left but had major shifts out of zone three or those colder zones and into warmer zones."

So what can gardeners in Central Wisconsin expect when throwing seeds into the earth?

"One of the things that gardeners can expect," Wehr said. "We can use the map as a rule of thumb. It's not going to tell us the coldest temperatures in the given year, but it'll give us a rule of thumb as to what types of plants will be hardy for us. So gardeners can use that indicator of whether or not they can grow zone 4. Perhaps they can even experiment with zone 5 plants."





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