What Growing Zone Is Coulee Dam?

Our records indicate the United States Department of Agriculture has given Coulee Dam a growing zone designation of 7a. Sometimes also called the planting or hardiness zone, this zone number gives you an idea of what plants can and cannot grow in Coulee Dam's climate based on the average extreme annual temperature. .Our data is based on the latest 2023 USDA maps, which used Coulee Dam's weather data from 1991 - 2020 in their analysis.

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

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Latest WA 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 Coulee Dam is in growing zone 7a this means that plants there can survive temperatures as low as 0 to 5 degrees Fahrenheit. Plants for Coulee Dam'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.

USDA growing zone map of the United States

Some zones may have been changed by the USDA as of 2023. To see if the Coulee Dam area has been affected, refer to this map of half zone changes from the 2012 version of the USDA zones to the 2023 version.

map of usda hardiness zone changes from 2012 to 2023

Half zone changes from 2012 to 2023

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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Coulee Dam's Growing Zone Details

USDA Growing Zone: 7a

Zip Codes: 99116

Longitude: -118.9759

Latitude: 47.9689

Lowest Avg Temperatures (F): 0 to 5

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Map of the Coulee Dam Area

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Shiitake Mushroom Kit

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Plants For Other States:

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Seed Starting Trays

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Brass Decorative Faucet Handle

Elegant brass handle to enhance your garden faucet.

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