What Growing Zone Is Mill Valley?

Our records indicate the United States Department of Agriculture has given Mill Valley 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 Mill Valley's climate based on the average extreme annual temperature.Our data is based on the latest 2023 USDA maps, which used Mill Valley'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 Mill Valley area, head on over to our page on plants that grow well in Mill Valley, CA.

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Deluxe Plastic Watering Can

High-capacity watering can with comfortable grip and precise spout.
Hydroponic Garden Grow Kit

Hydroponic Garden Grow Kit

Grow fresh herbs and vegetables year-round with this indoor hydroponic garden system.
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.
Self Watering Plant Pots

Self Watering Plant Pots

Innovative pots that maintain optimal moisture levels.
Shiitake Mushroom Kit

Shiitake Mushroom Kit

Grow your own delicious shiitake mushrooms at home.
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 Mill Valley is in growing zone 10a this means that plants there can survive temperatures as low as 30 to 35 degrees Fahrenheit. Plants for Mill Valley'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 Mill Valley 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 Mill Valley, CA.

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

Mill Valley's Growing Zone Details

USDA Growing Zone: 10a

Zip Codes: 94941, 94942

Longitude: -122.5421

Latitude: 37.9086

Lowest Avg Temperatures (F): 30 to 35

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Brass Decorative Faucet Handle

Elegant brass handle to enhance your garden faucet.
Shiitake Mushroom Kit

Shiitake Mushroom Kit

Grow your own delicious shiitake mushrooms at home.
Steel Hori Hori Weeding Knife

Steel Hori Hori Weeding Knife

Versatile Japanese-style gardening knife for weeding and planting.
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.

Map of the Mill Valley Area

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Deluxe Plastic Watering Can

Deluxe Plastic Watering Can

High-capacity watering can with comfortable grip and precise spout.
Seed Starting Trays

Seed Starting Trays

Perfect for starting seeds indoors before transplanting to your garden.
Hydroponic Garden Grow Kit

Hydroponic Garden Grow Kit

Grow fresh herbs and vegetables year-round with this indoor hydroponic garden system.
Raised Garden Bed Kit

Raised Garden Bed Kit

Easy-to-assemble raised garden bed for better soil control and drainage.
Hoeing Ain't Easy Garden Sign

Hoeing Ain't Easy Garden Sign

Fun and decorative garden sign to add personality to your space.

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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Metal Arbor Trellis

Metal Arbor Trellis

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

Raised Garden Bed Kit

Easy-to-assemble raised garden bed for better soil control and drainage.
Deluxe Plastic Watering Can

Deluxe Plastic Watering Can

High-capacity watering can with comfortable grip and precise spout.
Steel Hori Hori Weeding Knife

Steel Hori Hori Weeding Knife

Versatile Japanese-style gardening knife for weeding and planting.
Large Greenhouse Kit

Large Greenhouse Kit

Spacious greenhouse for extending your growing season.

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