What Growing Zone Is St. Mary's?

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

Latest AK growing zone map

If you are looking for plants suitable for growing in the St. Mary's area, head on over to our page on plants that grow well in St. Mary's, AK.

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

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

St. Mary's's Growing Zone Details

USDA Growing Zone: 4a

Zip Codes: 99658

Longitude: -163.2805

Latitude: 62.0718

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

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Map of the St. Mary's Area

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Brass Decorative Faucet Handle

Elegant brass handle to enhance your garden faucet.

Worm Composting Kit

Complete kit for starting your own worm composting system.

Small Greenhouse Kit

Compact greenhouse perfect for small spaces.

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Spacious greenhouse for extending your growing season.

Wooden Chicken Coop

Spacious and secure home for your backyard chickens.

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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