What Growing Zone Is Castle Hills?

Our records indicate the United States Department of Agriculture has given Castle Hills a growing zone designation of 9a. Sometimes also called the planting or hardiness zone, this zone number gives you an idea of what plants can and cannot grow in Castle Hills's climate based on the average extreme annual temperature.Our data is based on the latest 2023 USDA maps, which used Castle Hills's weather data from 1991 - 2020 in their analysis.

map of growing zone 9aLatest TX growing zone map

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

Large Greenhouse Kit

Large Greenhouse Kit

Spacious greenhouse for extending your growing season.
Brass Watering Can

Brass Watering Can

Elegant brass watering can with classic design and durability.
Raised Garden Bed Kit

Raised Garden Bed Kit

Easy-to-assemble raised garden bed for better soil control and drainage.
Wooden Chicken Coop

Wooden Chicken Coop

Spacious and secure home for your backyard chickens.
Raised Garden Planter

Raised Garden Planter

Elevated planter for easy access and better drainage.
map of growing zone 9aLatest TX 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 Castle Hills is in growing zone 9a this means that plants there can survive temperatures as low as 20 to 25 degrees Fahrenheit. Plants for Castle Hills'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 Castle Hills 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 Castle Hills, TX.

The USDA hardiness zone is 9a for Castle Hills. This is sometimes also referred to as the growing or planting zone. These terms are used interchangeably.

Castle Hills's Growing Zone Details

USDA Growing Zone: 9a

Zip Codes: 78213

Longitude: -98.5197

Latitude: 29.5229

Lowest Avg Temperatures (F): 20 to 25

Cluck Around Sign

Cluck Around Sign

Whimsical sign for your chicken coop area.
Metal Arbor Trellis

Metal Arbor Trellis

Decorative arbor trellis for climbing plants and garden entrance.
Raised Garden Planter

Raised Garden Planter

Elevated planter for easy access and better drainage.
Brass Decorative Faucet Handle

Brass Decorative Faucet Handle

Elegant brass handle to enhance your garden faucet.
Large Greenhouse Kit

Large Greenhouse Kit

Spacious greenhouse for extending your growing season.

Map of the Castle Hills Area

All Towns In TX

Shiitake Mushroom Kit

Shiitake Mushroom Kit

Grow your own delicious shiitake mushrooms at home.
Raised Garden Planter

Raised Garden Planter

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

Large Greenhouse Kit

Spacious greenhouse for extending your growing season.
Hoeing Ain't Easy Garden Sign

Hoeing Ain't Easy Garden Sign

Fun and decorative garden sign to add personality to your space.
Hydroponic Garden Grow Kit

Hydroponic Garden Grow Kit

Grow fresh herbs and vegetables year-round with this indoor hydroponic garden system.

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.

Alaska Alabama Arkansas Arizona California Colorado Connecticut Delaware Florida Georgia Hawaii Iowa Idaho Illinois Indiana Kansas Kentucky Louisiana Massachusetts Maryland Maine Michigan Minnesota Missouri Mississippi Montana North Carolina North Dakota Nebraska New Hampshire New Jersey New Mexico Nevada New York Ohio Oklahoma Oregon Pennsylvania Rhode Island South Carolina South Dakota Tennessee Texas Utah Virginia Vermont Washington Wisconsin West Virginia Wyoming
Metal Arbor Trellis

Metal Arbor Trellis

Decorative arbor trellis for climbing plants and garden entrance.
Seed Starting Trays

Seed Starting Trays

Perfect for starting seeds indoors before transplanting to your garden.
Worm Composting Kit

Worm Composting Kit

Complete kit for starting your own worm composting system.
Large Greenhouse Kit

Large Greenhouse Kit

Spacious greenhouse for extending your growing season.
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.

To see our latest gardening and homesteading projects, you can find us on Facebook, Instagram, and TikTok.