What Growing Zone Is Castaic?

Our records indicate the United States Department of Agriculture has given Castaic a growing zone designation of 10a. Sometimes also called the planting or hardiness zone, this zone number gives you an idea of what plants can and cannot grow in Castaic's climate based on the average extreme annual temperature.Our data is based on the latest 2023 USDA maps, which used Castaic's weather data from 1991 - 2020 in their analysis.

map of growing zone 10a (Northern California)map of growing zone 10aLatest CA growing zone map

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

Hoeing Ain't Easy Garden Sign

Hoeing Ain't Easy Garden Sign

Fun and decorative garden sign to add personality to your space.
Reusable Grow Bags

Reusable Grow Bags

Breathable fabric grow bags that promote healthy root growth for your vegetables and fruits.
Metal Seed Storage Box

Metal Seed Storage Box

Organized storage solution for your seed collection.
Cluck Around Sign

Cluck Around Sign

Whimsical sign for your chicken coop area.
Worm Composting Kit

Worm Composting Kit

Complete kit for starting your own worm composting system.
map of growing zone 10a (Northern California)map of growing zone 10aLatest CA 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 Castaic is in growing zone 10a this means that plants there can survive temperatures as low as 30 to 35 degrees Fahrenheit. Plants for Castaic'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 Castaic 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 Castaic, CA.

The USDA hardiness zone is 10a for Castaic. This is sometimes also referred to as the growing or planting zone. These terms are used interchangeably.

Castaic's Growing Zone Details

USDA Growing Zone: 10a

Zip Codes: 91384, 91310

Longitude: -118.6316

Latitude: 34.4818

Lowest Avg Temperatures (F): 30 to 35

Reusable Grow Bags

Reusable Grow Bags

Breathable fabric grow bags that promote healthy root growth for your vegetables and fruits.
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.
Steel Hori Hori Weeding Knife

Steel Hori Hori Weeding Knife

Versatile Japanese-style gardening knife for weeding and planting.
Brass Watering Can

Brass Watering Can

Elegant brass watering can with classic design and durability.

Map of the Castaic Area

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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.
Shiitake Mushroom Kit

Shiitake Mushroom Kit

Grow your own delicious shiitake mushrooms at home.
Brass Watering Can

Brass Watering Can

Elegant brass watering can with classic design and durability.
Worm Composting Kit

Worm Composting Kit

Complete kit for starting your own worm composting 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.

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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.
Hydroponic Garden Grow Kit

Hydroponic Garden Grow Kit

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

Wooden Chicken Coop

Spacious and secure home for your backyard chickens.
Brass Decorative Faucet Handle

Brass Decorative Faucet Handle

Elegant brass handle to enhance your garden faucet.
Metal Arbor Trellis

Metal Arbor Trellis

Decorative arbor trellis for climbing plants and garden entrance.

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