Are you wondering what zone you're in?
Here is a list:
Alabama: 7a, 7b, 8a, 8b
Alaska: 1a, 1b, 2a, 2b
Arizona: 3a, 3b, 4a, 4b, 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b
Arkansas: 6a, 6b, 7a, 7b, 8a, 8b
California: 4a, 4b, 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b, 9a, 9b, 10a, 10b
Colorado: 4a, 4b, 5a, 5b, 6a, 6b, 7a, 7b
Connecticut: 5a, 5b, 6a, 6b
Delaware: 6a, 6b, 7a, 7b
Florida: 8a, 8b, 9a, 9b, 10a, 10b
Georgia: 7a, 7b, 8a, 8b, 9a, 9b
Hawaii: 9a, 9b, 10a, 10b
Idaho: 4a, 4b, 5a, 5b, 6a, 6b
Illinois: 5a, 5b, 6a, 6b, 7a, 7b
Indiana: 5a, 5b, 6a, 6b, 7a
Iowa: 4a, 4b, 5a, 5b, 6a
Kansas: 5a, 5b, 6a, 6b, 7a
Kentucky: 6a, 6b, 7a, 7b
Louisiana: 7a, 7b, 8a, 8b
Maine: 4a, 4b, 5a, 5b, 6a
Maryland: 6a, 6b, 7a, 7b, 8a
Massachusetts: 5a, 5b, 6a, 6b, 7a
Michigan: 4a, 4b, 5a, 5b, 6a, 6b
Minnesota: 4a, 4b, 5a, 5b, 6a
Mississippi: 7a, 7b, 8a, 8b
Missouri: 6a, 6b, 7a, 7b
Montana: 3a, 3b, 4a, 4b, 5a, 5b
Nebraska: 5a, 5b, 6a, 6b
Nevada: 5a, 5b, 6a, 6b, 7a, 7b
New Hampshire: 5a, 5b, 6a, 6b
New Jersey: 6a, 6b, 7a, 7b
New Mexico: 5a, 5b, 6a, 6b, 7a, 7b
New York: 5a, 5b, 6a, 6b, 7a, 7b
North Carolina: 7a, 7b, 8a, 8b, 9a
North Dakota: 3a, 3b, 4a, 4b
Ohio: 5a, 5b, 6a, 6b, 7a
Oklahoma: 6a, 6b, 7a, 7b
Oregon: 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b
Pennsylvania: 6a, 6b, 7a, 7b
Rhode Island: 5a, 5b, 6a, 6b
South Carolina: 8a, 8b, 9a
South Dakota: 4a, 4b, 5a, 5b, 6a
Tennessee: 6a, 6b, 7a, 7b, 8a
Texas: 7a, 7b, 8a, 8b, 9a, 9b
Utah: 5a, 5b, 6a, 6b, 7a, 7b
Vermont: 4a, 4b, 5a, 5b, 6a
Virginia: 7a, 7b, 8a, 8b
Washington: 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b
West Virginia: 6a, 6b, 7a, 7b
Wisconsin: 4a, 4b, 5a, 5b, 6a
Wyoming: 4a, 4b, 5a, 5b, 6a
Still unsure? If you're in the coldest part of a state, the zone lowest in number will be yours.