What Growing Zone Is Haswell?

Our records indicate the United States Department of Agriculture has given Haswell a growing zone designation of 5b. Sometimes also called the planting or hardiness zone, this zone number gives you an idea of what plants can and cannot grow in Haswell's climate based on the average extreme annual temperature.Our data is based on the latest 2023 USDA maps, which used Haswell'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 Haswell area, head on over to our page on plants that grow well in Haswell, 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 Haswell is in growing zone 5b this means that plants there can survive temperatures as low as -15 to -10 degrees Fahrenheit. Plants for Haswell'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 Haswell 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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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 Haswell, CO.

The USDA hardiness zone is 5b for Haswell. This is sometimes also referred to as the growing or planting zone. These terms are used interchangeably.

Haswell's Growing Zone Details

USDA Growing Zone: 5b

Zip Codes: 81045

Longitude: -103.1649

Latitude: 38.4525

Lowest Avg Temperatures (F): -15 to -10

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Map of the Haswell Area

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