1990 Colorado USDA Plant Hardiness Zone Map

Historical Map — 1990 USDA Data: For current planting zone information view the 2023 Colorado USDA Hardiness Zone Map .

The 1990 USDA Plant Hardiness Zone Map for Colorado was the official USDA zone reference for over two decades. It was based on average annual extreme minimum winter temperature data collected from 1974 to 1986. Use the table below to compare 1990 zones to the revised 2012 zones and the current 2023 zones.

Map Cities Related Source

1990 Colorado Hardiness Zone Map

Click on the map for zone information. Use the legend icon (lower right) to view the color key. Use the layers control (upper right) to toggle county boundaries and state border.

List of 1990 Hardiness Zones for Locations in Colorado

Location1990 Hardiness Zone2012 Zone2023 Zone
Arvada5b — -15°F to -10°F6a — -10°F to -5°F6a — -10°F to -5°F
Aurora5b — -15°F to -10°F6a — -10°F to -5°F6a — -10°F to -5°F
Black Forest5a — -20°F to -15°F5b — -15°F to -10°F5b — -15°F to -10°F
Boulder5a — -20°F to -15°F6a — -10°F to -5°F6a — -10°F to -5°F
Brighton5b — -15°F to -10°F5b — -15°F to -10°F5b — -15°F to -10°F
Broomfield5b — -15°F to -10°F6a — -10°F to -5°F6a — -10°F to -5°F
Castle Rock4b — -25°F to -20°F5b — -15°F to -10°F5b — -15°F to -10°F
Centennial5a — -20°F to -15°F5b — -15°F to -10°F6a — -10°F to -5°F
Cimarron Hills5b — -15°F to -10°F6a — -10°F to -5°F6a — -10°F to -5°F
Clifton7a — 0°F to 5°F7a — 0°F to 5°F7a — 0°F to 5°F
Colorado Springs5a — -20°F to -15°F5b — -15°F to -10°F6a — -10°F to -5°F
Columbine5a — -20°F to -15°F5b — -15°F to -10°F6a — -10°F to -5°F
Commerce City5b — -15°F to -10°F5b — -15°F to -10°F6a — -10°F to -5°F
Denver5b — -15°F to -10°F5b — -15°F to -10°F6a — -10°F to -5°F
Durango5b — -15°F to -10°F6b — -5°F to 0°F6b — -5°F to 0°F
Englewood5a — -20°F to -15°F5b — -15°F to -10°F6a — -10°F to -5°F
Erie5a — -20°F to -15°F5b — -15°F to -10°F5b — -15°F to -10°F
Evans5b — -15°F to -10°F5b — -15°F to -10°F5b — -15°F to -10°F
Firestone5a — -20°F to -15°F5b — -15°F to -10°F5b — -15°F to -10°F
Fort Carson5b — -15°F to -10°F6a — -10°F to -5°F6a — -10°F to -5°F
Fort Collins5b — -15°F to -10°F5b — -15°F to -10°F5b — -15°F to -10°F
Fountain5b — -15°F to -10°F6a — -10°F to -5°F6a — -10°F to -5°F
Fruitvale7a — 0°F to 5°F7a — 0°F to 5°F7a — 0°F to 5°F
Golden5a — -20°F to -15°F5b — -15°F to -10°F6a — -10°F to -5°F
Grand Junction7a — 0°F to 5°F7a — 0°F to 5°F7a — 0°F to 5°F
Greeley5b — -15°F to -10°F5b — -15°F to -10°F5a — -20°F to -15°F
Greenwood Village5a — -20°F to -15°F5b — -15°F to -10°F6a — -10°F to -5°F
Highlands Ranch5a — -20°F to -15°F5b — -15°F to -10°F6a — -10°F to -5°F
Johnstown5a — -20°F to -15°F5b — -15°F to -10°F5b — -15°F to -10°F
Ken Caryl5a — -20°F to -15°F5b — -15°F to -10°F6a — -10°F to -5°F
Lafayette5a — -20°F to -15°F5b — -15°F to -10°F6a — -10°F to -5°F
Lakewood5a — -20°F to -15°F5b — -15°F to -10°F6a — -10°F to -5°F
Littleton5a — -20°F to -15°F5b — -15°F to -10°F6a — -10°F to -5°F
Longmont5a — -20°F to -15°F5b — -15°F to -10°F5b — -15°F to -10°F
Louisville5a — -20°F to -15°F6a — -10°F to -5°F6a — -10°F to -5°F
Loveland5a — -20°F to -15°F5b — -15°F to -10°F5b — -15°F to -10°F
Montrose5b — -15°F to -10°F6b — -5°F to 0°F6b — -5°F to 0°F
Northglenn5b — -15°F to -10°F6a — -10°F to -5°F6a — -10°F to -5°F
Parker5a — -20°F to -15°F5b — -15°F to -10°F5b — -15°F to -10°F
Pueblo5b — -15°F to -10°F5b — -15°F to -10°F6a — -10°F to -5°F
Pueblo West5b — -15°F to -10°F6a — -10°F to -5°F6a — -10°F to -5°F
Sherrelwood5b — -15°F to -10°F5b — -15°F to -10°F6a — -10°F to -5°F
Thornton5b — -15°F to -10°F6a — -10°F to -5°F6a — -10°F to -5°F
Timnath5b — -15°F to -10°F5b — -15°F to -10°F5b — -15°F to -10°F
Welby5b — -15°F to -10°F5b — -15°F to -10°F6a — -10°F to -5°F
Westminster5b — -15°F to -10°F5b — -15°F to -10°F6a — -10°F to -5°F
Wheat Ridge5b — -15°F to -10°F6a — -10°F to -5°F6a — -10°F to -5°F
Windsor5b — -15°F to -10°F5b — -15°F to -10°F5b — -15°F to -10°F

1990 Hardiness Zone Maps for Neighboring States

Data Source & Methodology

The 1990 USDA Plant Hardiness Zone Map was produced by the U.S. Department of Agriculture (USDA) Agricultural Research Service (ARS) in collaboration with the American Horticultural Society. It served as the official US planting zone reference from 1990 until the 2012 revision.

  • Publisher: USDA Agricultural Research Service (ARS)
  • Year Published: 1990
  • Climate Data Period: 1974–1986
  • Zone Basis: Average annual extreme minimum winter temperature
  • Number of Zones: 11 zones (1–11), each divided into a and b half-zones

Official source: USDA Plant Hardiness Zone Map — planthardiness.ars.usda.gov

This interactive map presentation is provided by PlantMaps. The underlying hardiness zone boundary data is sourced from the USDA Agricultural Research Service. Zone assignments for individual cities and towns are derived from PlantMaps climate data.

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