What Growing Zone Is Fort Irwin?

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

map of growing zone 9a (Northern California)map of growing zone 9aLatest CA growing zone map

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

Seed Starting Trays

Seed Starting Trays

Perfect for starting seeds indoors before transplanting to your garden.
Steel Hori Hori Weeding Knife

Steel Hori Hori Weeding Knife

Versatile Japanese-style gardening knife for weeding and planting.
Reusable Grow Bags

Reusable Grow Bags

Breathable fabric grow bags that promote healthy root growth for your vegetables and fruits.
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.
map of growing zone 9a (Northern California)map of growing zone 9aLatest 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 Fort Irwin is in growing zone 9a this means that plants there can survive temperatures as low as 20 to 25 degrees Fahrenheit. Plants for Fort Irwin'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 Fort Irwin 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 Fort Irwin, CA.

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

Fort Irwin's Growing Zone Details

USDA Growing Zone: 9a

Zip Codes: 92310

Longitude: -116.6834

Latitude: 35.2477

Lowest Avg Temperatures (F): 20 to 25

Wooden Chicken Coop

Wooden Chicken Coop

Spacious and secure home for your backyard chickens.
Metal Arbor Trellis

Metal Arbor Trellis

Decorative arbor trellis for climbing plants and garden entrance.
Fiskars Garden Harvest Basket

Fiskars Garden Harvest Basket

Sturdy basket for collecting and carrying your garden harvest.
Metal Seed Storage Box

Metal Seed Storage Box

Organized storage solution for your seed collection.
Worm Composting Kit

Worm Composting Kit

Complete kit for starting your own worm composting system.

Map of the Fort Irwin Area

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Reusable Grow Bags

Reusable Grow Bags

Breathable fabric grow bags that promote healthy root growth for your vegetables and fruits.
Worm Composting Kit

Worm Composting Kit

Complete kit for starting your own worm composting system.
Hoeing Ain't Easy Garden Sign

Hoeing Ain't Easy Garden Sign

Fun and decorative garden sign to add personality to your space.
Seed Starting Trays

Seed Starting Trays

Perfect for starting seeds indoors before transplanting to your garden.
Large Greenhouse Kit

Large Greenhouse Kit

Spacious greenhouse for extending your growing season.

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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Self Watering Plant Pots

Self Watering Plant Pots

Innovative pots that maintain optimal moisture levels.
Cluck Around Sign

Cluck Around Sign

Whimsical sign for your chicken coop area.
Steel Hori Hori Weeding Knife

Steel Hori Hori Weeding Knife

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

Deluxe Plastic Watering Can

High-capacity watering can with comfortable grip and precise spout.
Brass Decorative Faucet Handle

Brass Decorative Faucet Handle

Elegant brass handle to enhance your garden faucet.

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