Zone 1: (Upper) Midwestern United States – Illinois, Indiana, Iowa, Kansas, Kentucky, Michigan, Minnesota, Missouri and Ohio.
Zone 2: (Lower) Plains states from Texas to New Mexico and California.
Zone 3: (Newly Discovered) Mountainous areas in the Rockies and Sierra Nevada mountains. These include parts of Colorado and Wyoming; Utah; Idaho; Montana; Washington state; Oregon and British Columbia.
Zone 4: (Extremely Hot) Deserts in the Southwest and Central America. These include parts of Arizona, California, Nevada, New Mexico and Texas.
Zone 5: (Very Hot) Mountains in the Rocky Mountains region. These include most of Colorado, Wyoming, Montana and North Dakota.
Zone 6: (Average Temperature): Most temperate regions in Europe from England to Russia.
Zone 7: (Cold) Northern Europe, Scandinavia and northern Asia.
Zone 8: (Average Temperature): Most of southern Europe including Spain, Portugal, Italy and Greece.
Zone 9: (Temperate) Most of the US, including the Pacific coast, the plains states and east to the Mississippi River.
Zone 10: (Mild) Most of the Mediterranean including Spain, Portugal and Italy.
Zone 11: (Warm Wet) Marshes in southern Europe and northern Africa. These include parts of Spain, Portugal, Morocco, Tunisia and Algeria.
Zone 12: (Warm Mild) Most of the Caribbean Islands. These include the Bahamas, Cuba, Jamaica and Haiti.
Hardiness Zones of Each Country
Nearly each country has its own Hardiness Zones. The USA has 11 zones, while the UK has 7 zones.
Most countries have a Hardiness Zone map that you can use to see what zone you live in. These maps are readily available online and at your local nursery.
In this blog about Hardiness Zones Outside U.S.
you can read more about this topic. In this article you can also read about hardiness zones in canada, hardiness zones in australia and hardiness zones in mexico. We also write about hardiness zones in uk, hardiness zones for south america and hardiness zones for italy.
Hardiness Zones in the United States
The USDA Plant Hardiness Zones for the U.S.
divides the U.S. into 13 zones, from Zone 1 (equator) to Zone 13 (Arctic). Each zone is 10 degrees Fahrenheit. For example, Atlanta, Georgia is in USDA Hardiness Zone 7. The city’s average yearly low is 50.1 F and average yearly high is 76.4 F, which gives a span of 25.3 F. That means that the average yearly temperatures in Atlanta fall between the ranges of 25.3 F and -5.7 F.
The following is a list of the U.S.
states and their respective zones:
Hardiness Zones in Canada
The Canadian Hardiness Zone Map breaks the entire country into five different zones, from Zone 1a (equivalent to the heat of the equator) to 5b (similar to the colder climate of Greenland). Each zone is separated by 10 degrees of latitude and longitude.
The majority of Canada falls into zones 3 or 4.
Hardiness Zones in the United Kingdom
The Royal Horticultural Society has divided the United Kingdom into seven different zones, numbered from 1 to 7. These zones are based on average low temperatures during the winter.
In addition to these zones, they have also added a special eighth zone called “Outside Collecting” for areas that are too cold to grow plants outside all year long.
Sources & references used in this article:
Global plant hardiness zones for phytosanitary risk analysis by RD Magarey, DM Borchert, JW Schlegel – Scientia Agricola, 2008 – SciELO Brasil
Bamboo Plantation Garden Center by RD Magarey, DM Borchert, JW Schlegel – bamboogardencenter.com
Proposed minimum reporting standards for chemical analysis by …, R Goodacre, JL Griffin, T Hankemeier, N Hardy… – Metabolomics, 2007 – Springer
Zonas globais de resistência às plantas para análise de risco fitossanitário by RD Magarey, DM Borchert, JW Schlegel – Scientia Agricola, 2008 – revistas.usp.br
Ecosystem management in the United States: an assessment of current experience by SL Yaffee, IC Frentz, A Phillips, PW Hardy, B Thorpe… – 1996 – books.google.com