All About Planters

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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