The ‘USDA Plant Hardiness Zone Map’ outlines the different zones in which various types of trees, shrubs and plants will most likely survive. It is based on average extreme low temperatures over a 30 year period—not just the lowest temperature ever reached at any given time. Gardeners should understand that this map is a guide only – not a guarantee of gardening success, as climatic conditions are constantly changing and there are many other factors that can affect the success and failure of plants.
This map is an excellent starting point however if you are wondering if a certain plant will generally over-winter (survive the coolest temperatures). As well as using this map for reference, we recommend consulting other gardeners who have ‘hands-on’ experience of weather and gardening patterns in your area.
Along with year-to-year variations in weather, microclimates can also play a role in determining the right plants for your garden. Microclimates, which are small areas of varying weather conditions within larger zones, can be caused by local geography of the area such as hills and valleys as well as variations of solar and wind exposure. Even buildings and pavement in urban areas can create relatively small microclimates that can potentially produce different gardening results.
United States Frost Dates
Frost dates are arranged by region and include the first frost date of the season and the final frost date of the season. This simply means a period of time where you can safely set your plants out in your garden ensuring them with optimal growing temperatures during both day and night.
These frost dates reflect the average frost date for a region and may not be reliable in a particular year. You may want to check with local gardeners for more accurate frost date information.
Alabama – Indiana
Alabama
Station
Last Frost
First Frost
Birmingham
April 23
October 23
Dayton
April 18
October 16
Mobile
March 29
October 30
Ozark
April 10
October 25
Thomasville
April 19
October 18
Tuscaloosa
April 20
October 15
Alaska
Station
Last Frost
First Frost
Barrow
August 3
July 30
Beaver Falls
June 2
September 29
Fairbanks
June 21
August 14
Juneau
June 20
August 23
Ketchikan
May 29
September 25
Nome
July 24
August 2
Seward
June 6
September 8
Arkansas
Station
Last Frost
First Frost
Batesville
May 15
September 29
Fayetteville
May 9
November 29
Fort Smith
April 28
October 6
Hot Springs
April 21
October 18
Newport
April 23
October 8
Pine Bluff
April 16
October 14
Texarkana
April 22
October 22
Arizona
Station
Last Frost
First Frost
Flagstaff
July 3
August 16
Holbrook
June 16
September 13
Phoenix
March 23
November 9
Snowflake
June 20
September 13
Tucson
April 17
November 5
Yuma
March 11
November 21
California
Station
Last Frost
First Frost
Auburn
May 13
October 30
Berkeley
March 5
December 1
Chico
May 7
October 19
Eureka
April 25
November 5
Fresno
April 27
November 27
Lodi
May 2
October 18
Palm Springs
April 7
November 6
Pasadena
April 4
November 21
Sacramento
April 28
November 2
San Francisco
March 20
November 20
San Luis Obispo
May 8
November 1
UCLA
January 3
January 1
Colorado
Station
Last Frost
First Frost
Boulder
May 31
September 12
Denver
June 1
September 10
Durango
July 1
August 24
Estes Park
July 19
August 11
Las Animas
May 25
September 15
Norwood
June 28
August 20
Steamboat Springs
August 2
July 31
Sterling
May 30
September 5
Connecticut
Station
Last Frost
First Frost
Panbury
June 1
September 14
Hartford Brainard
May 25
September 15
Mount Carmel
May 29
September 15
Norfolk
June 11
September 9
Norwalk
May 24
September 21
Storrs
May 29
September 20
W. Thompson Dam
June 14
August 20
Delaware
Station
Last Frost
First Frost
Bridgeville
May 10
September 26
Dover
May 6
October 5
Georgetown
May 18
September 24
Lewes
May 4
October 6
Milford
May 14
September 25
Wilmington
May 10
October 3
Wheaton
June 1
September 16
Windsor
May 20
September 22
Florida
Station
Last Frost
First Frost
Fort Pierce
March 3
December 5
Gainesville
April 5
October 30
Jacksonville Beach
March 24
November 8
Miami
February 7
December 30
Sanford
March 14
November 16
Tallahassee
April 12
October 20
Tampa
March 11
November 15
Georgia
Station
Last Frost
First Frost
Athens
April 21
October 14
Augusta
April 26
October 12
Brunswick
March 31
November 5
Columbus
April 16
October 20
Macon
April 14
October 14
Savannah
April 11
October 26
Waycross
April 22
October 15
Hawaii
Station
Last Frost
First Frost
Haleakala
June 16
October 15
Hilo
none
none
Lahaina
none
none
Lihue
none
none
Idaho
Station
Last Frost
First Frost
Boise
June 9
September 13
Kellogg
July 4
August 23
Moscow
July 23
August 14
Pocatello
June 25
August 24
Salmon
July 12
August 19
Sandpoint
July 8
August 19
Shoshone
June 25
August 31
Illinois
Station
Last Frost
First Frost
Cairo
April 16
October 21
Chicago
May 17
September 30
Peoria
May 23
September 25
Rockford
May 26
September 19
Springfield
May 16
September 27
Wheaton
June 1
September 16
Windsor
May 20
September 22
Indiana
Station
Last Frost
First Frost
Columbia City
May 25
September 15
Evansville
May 10
October 4
Hobart
May 31
September 24
Indianapolis
May 19
September 28
Mount Vernon
May 9
October 1
Princeton
May 15
September 29
South Bend
May 27
September 20
Terre Haute
May 23
September 23
Iowa – Mississippi
Iowa
Station
Last Frost
First Frost
Ames
May 22
September 15
Cedar Rapids
May 25
September 16
Clarinda
May 7
September 12
Davenport
May 10
September 29
Le Mars
May 31
September 9
Mason City
May 30
September 9
Ottumwa
May 14
September 26
Kansas
Station
Last Frost
First Frost
Dodge City
May 11
September 29
Goodland
May 27
September 13
Newton
May 11
September 29
Phillipsburg
May 19
September 18
Salina
May 13
September 28
Topeka
May 15
September 23
Troy
May 15
September 23
Kentucky
Station
Last Frost
First Frost
Bowling Green
May 11
October 2
Ford's Ferry
April 30
October 7
Lexington
May 13
September 30
Middlesboro
May 23
September 25
Owensboro
May 11
September 26
Paducah
May 7
October 4
Vanceburg
May 31
September 21
Louisiana
Station
Last Frost
First Frost
Alexandria
April 5
October 21
Bastrop
April 13
October 18
Bunkie
April 2
October 22
Elizabeth
April 10
October 15
Houma
March 24
October 30
Lafayette
April 27
October 26
New Orleans
April 4
October 30
Maine
Station
Last Frost
First Frost
Houlton
July 3
August 25
Lewiston
April 23
September 19
Portland
June 4
September 8
Presque Isle.
June 18
August 23
Ripogenus
June 16
September 7
Rumford
June 14
September 5
Waterville
June 9
September 6
Maryland
Station
Last Frost
First Frost
Baltimore City
April 21
October 19
Cambridge
May 6
September 30
Crisfield Somers Cove
April 18
October 19
Hagerstown
April 18
September 22
Laurel
May 5
October 5
Pocomoke City
May 22
September 23
Salisbury
May 9
September 30
Massachusetts
Station
Last Frost
First Frost
Amherst
June 8
September 2
Birch Hill Dam
June 25
August 14
Blue Hill
May 18
September 23
Haverhill
May 23
September 18
New Bedford
May 3
October 10
Rochester
June 1
September 13
Worchester
May 23
September 21
Michigan
Station
Last Frost
First Frost
Cheboygan
June 11
September 15
Evart
June 29
August 13
Lansing
June 8
September 9
Marquette
June 5
September 19
Muskegon
June 4
September 9
Pontiac
May 31
September 18
Sault Ste Marie
June 23
August 29
Traverse City
June 22
September 6
Minnesota
Station
Last Frost
First Frost
Canby
May 30
September 8
Duluth
June 22
August 27
Faribault
June 2
September 8
Hallock
June 15
August 27
Intnl Falls
June 30
August 21
Marshall
May 24
September 12
Warroad
June 16
August 21
Mississippi
Station
Last Frost
First Frost
Biloxi
March 27
October 31
Columbus
April 21
October 7
Gulfport
March 27
October 27
Holly Springs
April 30
October 2
Meridian
April 17
October 10
Natchez
April 12
October 21
Yazoo City
April 15
October 10
Missouri – Oregon
Missouri
Station
Last Frost
First Frost
Canton
May 14
September 22
Charleston
May 4
October 2
Jefferson City
May 22
September 20
Joplin
May 5
October 4
Maryville
May 12
September 24
Macon
May 21
September 14
Maryville
May 1
October 2
Montana
Station
Last Frost
First Frost
Montana
Billings
June 10
September 1
Bozeman
June 3
July 30
Brady Aznde
July 21
August 12
Chinook
June 19
August 22
Choteau
June 27
August 26
Helena
June 23
August 25
Libby
August 3
August 3
Nebraska
Station
Last Frost
First Frost
Ainsworth
May 31
September 10
Falls City
May 9
September 25
Grand Island
May 21
September 12
North Platte
June 1
September 4
Scottsbluff
June 4
September 4
York
May 18
September 18
Nevada
Station
Last Frost
First Frost
Boulder City
April 9
November 10
Carson City
July 8
August 18
Ely
July 14
August 13
Las Vegas
April 19
October 31
Reno
July 9
August 12
Wells
July 21
August 5
Winnemucca
July 9
August 12
New Hampshire
Station
Last Frost
First Frost
Concord
June 21
August 21
Hanover
June 13
September 9
Keene
June 19
August 24
Lake Port
May 26
September 18
Mt. Washington
August 3
July 31
Nashua
June 15
September 1
Surry Mountain
June 18
August 25
New Jersey
Station
Last Frost
First Frost
Hammonton
May 19
September 23
Jersey City
April 30
October 9
Millville
May 13
September 27
Newark
April 26
October 13
Newton
June 6
September 9
Shiloh
May 12
October 2
Trenton
April 29
October 11
New Mexico
Station
Last Frost
First Frost
Aztec Ruins Nat. Mon.
June 18
September 8
Carlsbad Caverns
April 27
October 18
Fort Sumner
May 15
September 28
Las Vegas
June 3
September 15
Lordsburg
May 25
October 11
Socorro
May 22
September 27
Springer
June 8
September 12
New York
Station
Last Frost
First Frost
Albany
June 5
September 12
Dannemora
June 6
September 11
Elmira
April 26
September 8
New York
May 28
October 19
Syracuse
June 4
September 18
Watertown
May 18
September 13
North Carolina
Station
Last Frost
First Frost
Elizabeth City
May 2
October 11
Greensboro
May 12
October 5
Hickory
May 7
October 4
Lumberton
May 10
October 5
Morehead City
April 17
October 22
Raleigh
May 11
October 6
Waynesville
May 31
September 20
North Dakota
Station
Last Frost
First Frost
Cavalier
June 11
August 27
Jamestown
June 9
August 28
Linton
June 27
August 28
Minot
June 8
August 29
New Salem
June 21
August 17
Wahpeton
May 31
September 6
Ohio
Station
Last Frost
First Frost
Akron
May 29
September 26
Athens
June 8
September 10
Cinicinnati
May 12
October 1
Columbus
May 23
September 23
Dayton
May 19
September 26
Lima
May 24
September 15
Sandusky
May 10
October 2
Youngstown
June 6
September 17
Oklahoma
Station
Last Frost
First Frost
Boise City
May 9
September 21
Chattanooga
April 29
October 10
Idabel
April 24
October 12
Kingfisher
May 6
October 6
Lawton
April 24
October 13
Perry
May 1
October 7
Tulsa
April 27
October 13
Oregon
Station
Last Frost
First Frost
Brookings
May 6
October 28
Condon
July 11
August 16
Eugene
June 10
September 15
Grizzly
August 6
July 30
Newport
May 30
September 27
Pendleton
May 23
August 22
Portland
May 15
October 3
Pennsylvania – Wyoming
Pennsylvania
Station
Last Frost
First Frost
Allentown
May 19
September 22
Gettysburg
May 19
September 23
Johnstown
May 16
September 16
Pendelton
May 23
September 22
Portland
May 15
October 3
Meadville
June 8
September 11
Williamsport
May 21
September 19
Rhode Island
Station
Last Frost
First Frost
Block Island
May 9
October 13
Kingston
June 5
September 8
South Carolina
Station
Last Frost
First Frost
Anderson
April 26
October 9
Beaufort
April 13
October 26
Charleston City
March 28
November 9
Chester
May 8
October 7
Columbia
April 29
October 13
Union
May 16
October 3
Winnsbotle
May 2
October 11
South Dakota
Station
Last Frost
First Frost
Castlewood
June 23
August 29
Custer
July 20
August 7
Gettysburg
June 4
September 5
Huron
June 4
September 4
Mobridge
May 30
September 9
Rapid City
June 9
September 8
Sioux Falls
June 4
September 10
Tennessee
Station
Last Frost
First Frost
Chattanooga
April 3
October 9
Knoxville
April 22
October 13
Martin
May 4
October 3
Memphis
April 16
October 18
Nashville
April 30
October 7
Tullahoma
May 12
October 3
Union City
May 11
September 28
Texas
Station
Last Frost
First Frost
Austin
March 31
November 1
Brownsville
March 7
November 24
Corpus Christi
March 9
November 23
Denton
April 20
October 19
Galveston
March 15
November 21
Lubbock
May 5
October 8
Pecos
April 25
October 11
San Antonio
April 10
October 27
Utah
Station
Last Frost
First Frost
Black Rock
June 2
August 20
Cedar City
June 22
September 5
Logan
June 5
September 13
Nephi
June 16
September 9
Vernal
June 25
August 19
Wendover
May 19
September 26
Vermont
Station
Last Frost
First Frost
Bellows Falls
June 10
September 10
Burlington
June 8
September 7
Chelsea
June 15
August 6
Dorset
June 27
August 26
Montpelier
June 24
September 2
Newport
June 13
September 4
Virginia
Station
Last Frost
First Frost
Bedford
May 14
September 24
Burkes Garden
June 24
August 29
Lexington
May 26
September 23
Lynchburg
May 11
October 2
Norfolk
April 23
October 20
Richmond
May 7
October 2
Winchester
May 20
September 22
Washington
Station
Last Frost
First Frost
Bellingham
June 15
September 4
Davenport
July 21
August 19
Longview
June 3
September 29
Seattle
May 14
October 10
Spokane
June 6
September 7
Vancouver
June 1
October 11
Walla Walla
May 2
October 4
West Virginia
Station
Last Frost
First Frost
Beckley
June 13
August 31
Elkins
June 10
September 21
Fairmont
June 1
September 19
Hamlin
May 30
September 20
Martinsburg
May 21
September 17
Parkersburg
May 18
September 23
Wheeling
May 20
September 27
Wisconsin
Station
Last Frost
First Frost
Ashland
June 28
August 22
Green Bay
June 9
September 10
Janesville
May 27
September 16
La Crosse
May 25
September 17
Milwaukee
June 1
September 17
Wausau
June 5
September 9
Wyoming
Station
Last Frost
First Frost
Casper
June 20
August 28
Dixon
July 13
August 12
Jackson
August 3
July 31
Laramie
July 8
August 14
Powell
June 10
September 3
Rock Springs
June 29
August 23
Sheridan
June 29
August 29
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