What Growing Zone Is Rock River?

Our records indicate the United States Department of Agriculture has given Rock River a growing zone designation of 4b. Sometimes also called the planting or hardiness zone, this zone number gives you an idea of what plants can and cannot grow in Rock River's climate based on the average extreme annual temperature.Our data is based on the latest 2023 USDA maps, which used Rock River's weather data from 1991 - 2020 in their analysis.

map of growing zone 4bLatest WY growing zone map

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

Metal Arbor Trellis

Metal Arbor Trellis

Decorative arbor trellis for climbing plants and garden entrance.
Metal Seed Storage Box

Metal Seed Storage Box

Organized storage solution for your seed collection.
Raised Garden Planter

Raised Garden Planter

Elevated planter for easy access and better drainage.
Small Greenhouse Kit

Small Greenhouse Kit

Compact greenhouse perfect for small spaces.
Worm Composting Kit

Worm Composting Kit

Complete kit for starting your own worm composting system.
map of growing zone 4bLatest WY 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 Rock River is in growing zone 4b this means that plants there can survive temperatures as low as -25 to -20 degrees Fahrenheit. Plants for Rock River'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 Rock River 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 2023Half 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!

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 Rock River, WY.

The USDA hardiness zone is 4b for Rock River. This is sometimes also referred to as the growing or planting zone. These terms are used interchangeably.

Rock River's Growing Zone Details

USDA Growing Zone: 4b

Zip Codes: 82083

Longitude: -105.9752

Latitude: 41.7317

Lowest Avg Temperatures (F): -25 to -20

Worm Composting Kit

Worm Composting Kit

Complete kit for starting your own worm composting system.
Shiitake Mushroom Kit

Shiitake Mushroom Kit

Grow your own delicious shiitake mushrooms at home.
Stainless Steel Garden Tool Set

Stainless Steel Garden Tool Set

Complete garden tool set with heavy-duty stainless steel tools for all your gardening needs.
Fiskars Garden Harvest Basket

Fiskars Garden Harvest Basket

Sturdy basket for collecting and carrying your garden harvest.
Metal Arbor Trellis

Metal Arbor Trellis

Decorative arbor trellis for climbing plants and garden entrance.

Map of the Rock River Area

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Hoeing Ain't Easy Garden Sign

Hoeing Ain't Easy Garden Sign

Fun and decorative garden sign to add personality to your space.
Shiitake Mushroom Kit

Shiitake Mushroom Kit

Grow your own delicious shiitake mushrooms at home.
Rustic Iron Garden Trellis

Rustic Iron Garden Trellis

Sturdy trellis for supporting climbing plants and vines.
Fiskars Garden Harvest Basket

Fiskars Garden Harvest Basket

Sturdy basket for collecting and carrying your garden harvest.
Brass Decorative Faucet Handle

Brass Decorative Faucet Handle

Elegant brass handle to enhance your garden faucet.

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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Shiitake Mushroom Kit

Shiitake Mushroom Kit

Grow your own delicious shiitake mushrooms at home.
Small Greenhouse Kit

Small Greenhouse Kit

Compact greenhouse perfect for small spaces.
Hydroponic Garden Grow Kit

Hydroponic Garden Grow Kit

Grow fresh herbs and vegetables year-round with this indoor hydroponic garden system.
Rustic Iron Garden Trellis

Rustic Iron Garden Trellis

Sturdy trellis for supporting climbing plants and vines.
Raised Garden Planter

Raised Garden Planter

Elevated planter for easy access and better drainage.

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