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Turtlegaby's Tropical Oasis

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 Are gardening and exotic plants your passion? Turtlegaby's Tropical Oasis is the source where you find Olive Tree, Passion vines, Brugmansia, Protea, Datura, Maca, Leucadendron, Hibiscus, Ginger, Leucospermum, fruit trees, climbers, vines, cold hardy palms & more. Bulk orders @ discount prices
USDA hardiness zones
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Find your USDA hardiness zone  by Zip Code

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Converting Fahrenheit into Celcius or the opposite



What are hardiness zones?

It seems every gardening book and nursery catalog refers to plant hardiness zones, also known as climate zones or growing zones. If you`re new to gardening, you may be wondering what all the fuss is with these zones, and how to find out which zone you are gardening in. Basically, plant hardiness zones are a guide to help you know which plants will grow where you live, so you don`t plant things that will soon die just because they can`t manage your region`s temperatures. Plants vary in the temperature extremes they can endure. Basic laboratory testing can determine the lowest sustained temperature a particular plant type can withstand, but, as gardeners, we still need to know how these measurements relate to our own gardens.

Hardiness Zones -- Details

Zones 2-10 in the map have been subdivided into light- and dark-colored sections (a and b) that represent 5 F (2.8 C) differences within the 10 F (5.6 C) zone. The light color of each zone represents the colder section; the dark color, the warmer section. Zone 11 represents any area where the average annual minimum temperature is above 40 F (4.4 C)

The map shows 20 latitude and longitude lines. Areas above an arbitrary elevation are traditionally considered unsuitable for plant cropping and do not bear appropriate zone designations. There are also island zones that, because of elevation differences, are warmer or cooler than the surrounding areas and are given a different zone designation. te that many large urban areas carry a warmer zone designation than the surrounding countryside. The map-contains as much detail as possible, considering the vast amount of data on which it is based and its size.

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

USDA Hardiness zone map