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USDA Plant Hardiness Zone Map & Legend

(provided by the United States National Arboretum)

The Chicago area is zone 5a & 5b.

It is important to understand that this determines the plants, shrubs, and trees that are most likely to survive our winter weather. When reading plant tags on perennials, shrubs, and trees, verify that the hardiness is listed as 5 or less, if you wish to see them return for future seasons of enjoyment.

USDA Plant Hardiness Zone Map

USDA Hardiness Zones and Average Annual Minimum Temperature Range

Zone

Fahrenheit

Celsius

Example Cities

1

Below -50 F

Below -45.6 C

Fairbanks, Alaska; Resolute, Northwest Territories (Canada)

2a

-50 to -45 F

-42.8 to -45.5 C

Prudhoe Bay, Alaska; Flin Flon, Manitoba (Canada)

2b

-45 to -40 F

-40.0 to -42.7 C

Unalakleet, Alaska; Pinecreek, Minnesota

3a

-40 to -35 F

-37.3 to -39.9 C

International Falls, Minnesota; St. Michael, Alaska

3b

-35 to -30 F

-34.5 to -37.2 C

Tomahawk, Wisconsin; Sidney, Montana

4a

-30 to -25 F

-31.7 to -34.4 C

Minneapolis/St.Paul, Minnesota; Lewistown, Montana

4b

-25 to -20 F

-28.9 to -31.6 C

Northwood, Iowa; Nebraska

5a

-20 to -15 F

-26.2 to -28.8 C

Des Moines, Iowa; Illinois

5b

-15 to -10 F

-23.4 to -26.1 C

Columbia, Missouri; Mansfield, Pennsylvania

6a

-10 to -5 F

-20.6 to -23.3 C

St. Louis, Missouri; Lebanon, Pennsylvania

6b

-5 to 0 F

-17.8 to -20.5 C

McMinnville, Tennessee; Branson, Missouri

7a

0 to 5 F

-15.0 to -17.7 C

Oklahoma City, Oklahoma; South Boston, Virginia

7b

5 to 10 F

-12.3 to -14.9 C

Little Rock, Arkansas; Griffin, Georgia

8a

10 to 15 F

-9.5 to -12.2 C

Tifton, Georgia; Dallas, Texas

8b

15 to 20 F

-6.7 to -9.4 C

Austin, Texas; Gainesville, Florida

9a

20 to 25 F

-3.9 to -6.6 C

Houston, Texas; St. Augustine, Florida

9b

25 to 30 F

-1.2 to -3.8 C

Brownsville, Texas; Fort Pierce, Florida

10a

30 to 35 F

1.6 to -1.1 C

Naples, Florida; Victorville, California

10b

35 to 40 F

4.4 to 1.7 C

Miami, Florida; Coral Gables, Florida

11

above 40 F

above 4.5 C

Honolulu, Hawaii; Mazatlan, Mexico

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web page updated: 02.26.14