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Hardiness Zones By State

Gardening across the United States can look very different depending on where you are from. Some areas experience cold and hot season variations while others have wet and dry seasons. These differences make a great impact on the steps you will need to take to have a successful garden. To help you better understand your local climates we have compiled some resources for you to get the best information for your location. Below you will find some university links that will either take you to your Land Grant University, its extention website, or another university with a valuable reputation for agricultural information. We encourage you to utilize the information they provide, as well as the universities of other states which share similar climates with you.

Please note that this information is mainly gathered keeping the USDA Cold Hardiness Zones by state in mind, however the best success will be had when other microclimate factors such as precipitation, humidity, heat zones, elevation, etc. are taken into account. For this reason we recomend you gain an understanding of your most important factors to consider through your Land Grant University.

Alabama

Additional Resources:

University of Arkansas

Mississippi State University

Prairie View A&M University

Clemson University

Alaska

Zones 1-8a
University of Alaska Fairbanks
Univ. of Alaska Fairbanks - Lawn & Garden

Additional Resources:

University of Minnesota

Michigan State University

North Dakota State University

University of Idaho

University of Maine

Arizona

Zones 6-10a
University of Arizona
University of Arizona - Home Gardening

Additional Resources:

University of California

New Mexico State University

University of Nevada

Prairie View A&M University

University of Florida

Arkansas

Zones 6b-8a
University of Arkansas

Additional Resources:

Mississippi State University

University of Missouri

University of Georgia

Oklahoma State University

North Carolina State University

California

Zones 6-11a
University of California

Additional Resources:

Utah State University

Oregon State University

University of Nevada

New Mexico State University

University of Florida

Prairie View A&M University

Colorado

Additional Resources:

Utah State University

University of Alaska Fairbanks

University of Wyoming

University of Idaho

Montana State University

Michigan State University

Connecticut

Zones 5b-7
University of Connecticut

Additional Resources:

University of Delaware

University of Maryland

University of Massachusetts Amherst

Pennsylvania State University

Rutgers University

Delaware

Additional Resources:

University of Connecticut

University of Maryland

University of Massachusetts Amherst

Rutgers University

University of Rhode Island

Florida

Zones 8-11a
University of Florida

Additional Resources:

University of California

Louisiana State University

University of Hawaii

Georgia

Zones 6-9
University of Georgia

Additional Resources:

University of Arkansas

North Carolina State University

University of California

Prairie View A&M University

Clemson University

Hawaii

Zone 11
University of Hawaii

Additional Resources:

University of Florida

Idaho

Zones 3-7
University of Idaho
University of Idaho Garden & Landscapes

Additional Resources:

University of Alaska Fairbanks

University of Wyoming

Utah State University

Colorado State University

Michigan State University

Illinois

Zones 5-7a
University of Illinois

Additional Resources:

University of Missouri

Kansas State University

University of Kentucky

Pennsylvania State University

Tennessee State University

Purdue University

Indiana

Zones 5b-6
Purdue University

Additional Resources:

University of Illinois

Kansas State University

University of Kentucky

Ohio State University

West Virginia University

Iowa

Zone 5
Iowa State University

Purdue University

Iowa State University Yard & Garden

Additional Resources:

University of Nebraska

University of Wisconsin - Madison

Kansas

Zones 5-6
Kansas State University

Additional Resources:

University of Illinois

West Virginia University

Ohio State University

Purdue University

University of Kentucky

University of Connecticut

Kentucky

Zone 6
University of Kentucky

Additional Resources:

Purdue University

University of Illinois

University of Connecticut

University of Delaware

Louisiana

Zones 8-9
Louisiana State University

Additional Resources:

Mississippi State University

University of Georgia

Alabama A&M

Clemson University

Maine

Zones 3-6
University of Maine

Additional Resources:

University of Alaska Fairbanks

Michigan State University

Cornell University

Colorado State University

University of Vermont

University of New Hampshire

Maryland

Zones 5b-8a
University of Maryland

Additional Resources:

University of Connecticut

University of Delaware

University of Massachusetts Amherst

Purdue University

North Carolina State University

Massachusetts

Zones 5-7
University of Massachusetts Amherst

Additional Resources:

University of Connecticut

University of Delaware

Purdue University

University of Maryland

Rutgers University

Michigan

Zones 3b-6
Michigan State University

Additional Resources:

University of Alaska Fairbanks

Utah State University

University of Maine

University of Idaho

Cornell University

University of Wyoming

Minnesota

Additional Resources:

University of Alaska Fairbanks

University of Maine

Michigan State University

Colorado State University

North Dakota State University

University of Vermont

Mississippi

Zones 7b-9a
Mississippi State University

Additional Resources:

Clemson University

University of Arkansas

Prairie View A&M University

North Carolina State University

Oregon State University

Missouri

Zones 5b-7
University of Missouri Extension

Additional Resources:

Purdue University

Pennsylvania State University

Kansas State University

Tennessee State University

University of Illinois

Montana

Zones 3-6a
Montana State University

Additional Resources:

University of Alaska Fairbanks

Colorado State University

University of Idaho

Utah State University

University of Wyoming

Michigan State University

Nebraska

Zones 4-5b
University of Nebraska

Additional Resources:

University of Alaska Fairbanks

South Dakota State University

Iowa State University

Colorado State University

Nevada

Zones 4-10a
University of Nevada

Additional Resources:

University of Arizona

University of California

New Mexico State University

Utah State University

Prairie View A&M University

University of Florida

New Hampshire

Zones 3b-6a
University of New Hampshire

Additional Resources:

University of Alaska Fairbanks

University of Maine

Michigan State University

Cornell University

University of Wisconsin - Madison

University of Vermont

New Jersey

Zones 6-7b
Rutgers University

Additional Resources:

University of Connecticut

University of Delaware

University of Maryland

University of Massachusetts Amherst

University of Missouri

University of Rhode Island

New Mexico

Zones 5-9a
New Mexico State University

Additional Resources:

University of Arizona

University of California

Utah State University

University of Nevada

New York

Zones 3-7
Cornell University

Additional Resources:

University of Alaska Fairbanks

University of Maine

Michigan State University

University of Vermont

University of New Hampshire

Colorado State University

North Carolina

Zones 5-8
North Carolina State University

Additional Resources:

Virginia Tech

Rutgers University

University of Missouri

Purdue University

University of Massachusetts Amherst

University of Georgia

University of Arkansas

North Dakota

Zones 2b-4
North Dakota State University

Additional Resources:

University of Alaska Fairbanks

Colorado State University

University of Idaho

University of Wyoming

University of Minnesota

University of Wisconsin - Madison

Ohio

Zones 5b-6
Ohio State University

Additional Resources:

University of Illinois

Purdue University

Kansas State University

West Virginia University

University of Missouri

University of Kentucky

Oklahoma

Zones 6-8a
Oklahoma State University

Additional Resources:

Utah State University

Rutgers University

University of Arkansas

University of Delaware

University of Georgia

Oregon

Zones 5-9
Oregon State University
Oregon State University Veg. Production

Additional Resources:

University of California

University of Missouri

Utah State University

Washington State University

University of Arkansas

Pennsylvania

Additional Resources:

Purdue University

University of Missouri

Ohio State University

University of Illinois

University of Connecticut

Rhode Island

Zones 6-7a
University of Rhode Island

Additional Resources:

University of Connecticut

University of Delaware

University of Illinois

Purdue University

University of Massachusetts Amherst

Rutgers University

South Carolina

Zones 7b-9a
Clemson University

Additional Resources:

University of Arkansas

North Carolina State University

Prairie View A&M University

Oregon State University

University of Maryland

South Dakota

Zones 4-5a
South Dakota State University

Additional Resources:

University of Nebraska

University of Alaska Fairbanks

Iowa State University

University of Minnesota

Montana State University

Tennessee

Additional Resources:

Kansas State University

University of Kentucky

University of Missouri

Pennsylvania State University

University of Illinois

Texas

Zones 6b-10a
Prairie View A&M University

Additional Resources:

University of Arkansas

Louisiana State University

Utah State University

Oklahoma State University

University of Nevada

New Mexico State University

Utah

Zones 3b-9a
Utah State University

Additional Resources:

Colorado State University

University of Idaho

Michigan State University

University of Nevada

Cornell University

University of Arizona

Vermont

Zones 3-5
University of Vermont

Additional Resources:

University of Alaska Fairbanks

University of Maine

University of Minnesota

University of New Hampshire

University of Wisconsin - Madison

Colorado State University

Virginia

Zones 5b-8a
Virginia Tech

Additional Resources:

University of Connecticut

Rutgers University

Purdue University

University of Massachusetts Amherst

University of Missouri

North Carolina State University

Pennsylvania State University

Washington

Zones 4b-9a
Washington State University

Additional Resources:

Utah State University

University of Arkansas

University of California

Oregon State University

University of Connecticut

West Virginia

Zones 5-6
West Virginia University

Additional Resources:

University of Massachusetts Amherst

University of Kentucky

University of Illinois

Ohio State University

University of Missouri

University of Maryland

Wisconsin

Zones 3b-5
University of Wisconsin - Madison

Additional Resources:

University of Alaska Fairbanks

University of Maine

Michigan State University

University of Minnesota

North Dakota State University

Montana State University

Wyoming

Additional Resources:

University of Alaska Fairbanks

Colorado State University

University of Idaho

Utah State University

Michigan State University

University of Wisconsin - Madison