Iowa Plant Hardiness Zones

Hardiness Zones, also referred to as Growing Zones or Planting zones are defined by the U.S. Department of Agriculture (USDA) Agricultural Research Service (ARS). The zones in this map were created in 2023 using mean extreme climate data covering the period of 1991 to 2020. The previous version of this map released in 2012 was created using climate data from the period of 1976-2005. The data in the 2012 maps covered a cooler period than the 2023 maps.

Map Cities Related

Iowa Hardiness Zones Map - 2023

Click on the map for more information. Click on the icon in the lower right to view the map legend. Add additional data layers using the icon in the upper right corner.

List of Hardiness Zones for Locations in Iowa

Location2023 Hardiness Zone2012 Hardiness Zone1990 Hardiness Zone
Altoona5b - -15°F to -10°F 5a - -20°F to -15°F5a - -20°F to -15°F
Ames5b - -15°F to -10°F 5a - -20°F to -15°F5a - -20°F to -15°F
Ankeny5b - -15°F to -10°F 5a - -20°F to -15°F5a - -20°F to -15°F
Bettendorf5b - -15°F to -10°F 5b - -15°F to -10°F5a - -20°F to -15°F
Burlington6a - -10°F to -5°F 5b - -15°F to -10°F5a - -20°F to -15°F
Cedar Falls5a - -20°F to -15°F 5a - -20°F to -15°F4b - -25°F to -20°F
Cedar Rapids5b - -15°F to -10°F 5a - -20°F to -15°F5a - -20°F to -15°F
Clinton5b - -15°F to -10°F 5b - -15°F to -10°F5a - -20°F to -15°F
Clive5b - -15°F to -10°F 5b - -15°F to -10°F5a - -20°F to -15°F
Coralville5b - -15°F to -10°F 5b - -15°F to -10°F5a - -20°F to -15°F
Council Bluffs5b - -15°F to -10°F 5b - -15°F to -10°F5a - -20°F to -15°F
Davenport5b - -15°F to -10°F 5b - -15°F to -10°F5a - -20°F to -15°F
Des Moines5b - -15°F to -10°F 5b - -15°F to -10°F5a - -20°F to -15°F
Dubuque5a - -20°F to -15°F 5a - -20°F to -15°F5a - -20°F to -15°F
Fort Dodge5a - -20°F to -15°F 5a - -20°F to -15°F4b - -25°F to -20°F
Grimes5b - -15°F to -10°F 5a - -20°F to -15°F5a - -20°F to -15°F
Indianola5b - -15°F to -10°F 5a - -20°F to -15°F4b - -25°F to -20°F
Iowa City5b - -15°F to -10°F 5b - -15°F to -10°F5a - -20°F to -15°F
Johnston5b - -15°F to -10°F 5a - -20°F to -15°F5a - -20°F to -15°F
Marion5b - -15°F to -10°F 5a - -20°F to -15°F5a - -20°F to -15°F
Marshalltown5a - -20°F to -15°F 5a - -20°F to -15°F4b - -25°F to -20°F
Mason City5a - -20°F to -15°F 5a - -20°F to -15°F4b - -25°F to -20°F
Muscatine5b - -15°F to -10°F 5b - -15°F to -10°F5a - -20°F to -15°F
Newton5b - -15°F to -10°F 5b - -15°F to -10°F5a - -20°F to -15°F
North Liberty5b - -15°F to -10°F 5b - -15°F to -10°F5a - -20°F to -15°F
Ottumwa5b - -15°F to -10°F 5b - -15°F to -10°F5a - -20°F to -15°F
Sioux City5a - -20°F to -15°F 5a - -20°F to -15°F4b - -25°F to -20°F
Urbandale5b - -15°F to -10°F 5a - -20°F to -15°F5a - -20°F to -15°F
Waterloo5a - -20°F to -15°F 5a - -20°F to -15°F4b - -25°F to -20°F
Waukee5b - -15°F to -10°F 5a - -20°F to -15°F5a - -20°F to -15°F
West Des Moines5b - -15°F to -10°F 5b - -15°F to -10°F5a - -20°F to -15°F

Hardiness Zone Maps for Neighboring States

2024 plantmaps.com