What Growing Zone Is Mercer?

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

Latest WI growing zone map

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

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Latest WI 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 Mercer is in growing zone 4a this means that plants there can survive temperatures as low as -30 to -25 degrees Fahrenheit. Plants for Mercer'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 Mercer 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 Mercer, WI.

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

Mercer's Growing Zone Details

USDA Growing Zone: 4a

Zip Codes:

54547

Longitude: -90.0528

Latitude: 46.1635

Lowest Avg Temperatures (F): -30 to -25

Cute Foldable Straw Bow Hat

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Hoeing Ain't Easy Garden Sign

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Map of the Mercer Area

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Hook Sauk City Saukville Saxon Sayner Scandinavia Schofield Seneca Sextonville Seymour Sharon Shawano Sheboygan Sheboygan Falls Sheldon Shell Lake Sherwood Shiocton Shopiere Shorewood Shorewood Hills Shullsburg Siren Sister Bay Slinger Sobieski Soldiers Grove Solon Springs Somers Somerset South Milwaukee South Wayne Sparta Spencer Spooner Spring Green Spring Valley Springbrook Springfield St. Cloud St. Croix Falls St. Francis St. Joseph St. Nazianz St. Peter Stanley Star Prairie Stetsonville Steuben Stevens Point Stockbridge Stockholm Stoddard Stone Lake Stoughton Stratford Strum Sturgeon Bay Sturtevant Suamico Sullivan Summit Lake Sun Prairie Superior Suring Sussex Tainter Lake Taycheedah Taylor Tennyson Theresa Thiensville Thornton Thorp Three Lakes Tichigan Tigerton Tilleda Tomah Tomahawk Tony Townsend Trego Trempealeau Tunnel City Turtle Lake Tustin Twin Lakes Two Rivers Union Center Union Grove Unity Valders Van Dyne Vernon Verona Vesper Village of Waukesha Viola Viroqua Wabeno 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Decorative arbor trellis for climbing plants and garden entrance.

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Spacious greenhouse for extending your growing season.

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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.

Metal Arbor Trellis

Decorative arbor trellis for climbing plants and garden entrance.

Small Greenhouse Kit

Compact greenhouse perfect for small spaces.

Large Greenhouse Kit

Spacious greenhouse for extending your growing season.

Cute Foldable Straw Bow Hat

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Add a touch of feng shui to the garden with this popular pagoda statue.

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