What Growing Zone Is 57439?

Our records indicate the United States Department of Agriculture has given zip code 57439 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 zip code 57439's climate based on the average extreme annual temperature.Our data is based on the latest 2023 USDA maps, which used weather data from 1991 - 2020 in their analysis.

Latest South Dakota growing zone map

If you are looking for plants suitable for growing in zip code 57439, head on over to our page on plants that grow well in Ferney, South Dakota.

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Latest South Dakota 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 zip code 57439 is in growing zone 4a this means that plants there can survive temperatures as low as -30 to -25 degrees Fahrenheit. Plants for zip code 57439'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 zip code 57439 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 for zip code 57439.

The USDA hardiness zone is 4a for zip code 57439. This is sometimes also referred to as the growing or planting zone. These terms are used interchangeably.

57439's Growing Zone Details

USDA Growing Zone: 4a

Zip Codes:

57439

Longitude: -98.10007

Latitude: 45.33464

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

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Map of the 57439 Area

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