What Growing Zone Is Westminster?

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

Latest CO growing zone map

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

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Latest CO 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 Westminster is in growing zone 6a this means that plants there can survive temperatures as low as -10 to -5 degrees Fahrenheit. Plants for Westminster'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 Westminster 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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Westminster's Growing Zone Details

USDA Growing Zone: 6a

Zip Codes: 80030, 80031, 80234, 80005, 80003, 80021, 80020, 80035

Longitude: -105.0624

Latitude: 39.8837

Lowest Avg Temperatures (F): -10 to -5

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Map of the Westminster Area

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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.

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