Container Gardening Tips
USDA Plant Hardiness Zones
& Average Annual Minimum Temperature Range
Use this chart to determine the plant hardiness zone you live in to help you make wise choices when you select plants for your container garden. This is most important when planting perennials and ordering from plant catalogs or nurseries outside of your region. Every plant has been given a zone designation, so inquire at the nursery where you purchase the plant if you are not sure.
Zone | Fahrenheit | Celsius | 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 ; Vancouver, BC (Canada) |
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 |
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