Colorado planting zones & frost dates

USDA hardiness zones in Colorado go from 4b to 7a. Pick your city for its average frost dates and a planting calendar, or search by ZIP code.

CityZoneAvg. last frostAvg. first frost
Arvada6aMay 5Oct 5
Aurora6aMay 4Oct 8
Berkley6aMay 5Oct 5
Black Forest5bMay 9Oct 6
Boulder6aMay 6Oct 5
Brighton5bMay 3Oct 7
Broomfield6aMay 2Oct 11
Castle Pines North5bMay 9Oct 2
Castle Rock5bMay 9Oct 2
Cañon City6aMay 4Oct 7
Centennial6aMay 5Oct 8
Cherry Creek6aMay 7Oct 8
Clifton7aApr 23Oct 20
Colorado Springs6aMay 3Oct 8
Columbine6aMay 2Oct 11
Commerce City6aMay 4Oct 8
Dakota Ridge6aMay 2Oct 11
Denver6aApr 30Oct 12
Durango6bMay 21Oct 2
Edwards5bJun 6Sep 14
Englewood6aMay 2Oct 11
Erie5bMay 7Oct 5
Evans5bMay 2Oct 8
Federal Heights6aMay 2Oct 11
Firestone5bMay 7Oct 5
Fort Carson6aMay 3Oct 8
Fort Collins5bMay 2Oct 7
Fort Morgan5bMay 6Oct 6
Fountain6aMay 3Oct 8
Frederick5bMay 7Oct 5
Fruita7aApr 27Oct 11
Golden6aMay 3Oct 14
Grand Junction7aApr 14Oct 23
Greeley5bMay 2Oct 8
Greenwood Village6aMay 2Oct 11
Highlands Ranch6aMay 5Oct 8
Johnstown5bMay 10Oct 1
Ken Caryl6aMay 2Oct 11
Lafayette6aMay 2Oct 11
Lakewood6aMay 3Oct 7
Littleton6aMay 2Oct 11
Lone Tree6aMay 5Oct 8
Longmont5bMay 7Oct 5
Louisville6aMay 6Oct 5
Loveland5bMay 10Oct 1
Montrose6bApr 28Oct 14
Northglenn6aMay 2Oct 11
Parker5bMay 9Oct 3
Pueblo6aApr 30Oct 9
Pueblo West6aApr 26Oct 13
Security-Widefield6aMay 3Oct 8
Sherrelwood6aMay 2Oct 11
Steamboat Springs4bJun 9Sep 12
Sterling5bApr 30Oct 9
Superior6aMay 6Oct 5
The Pinery5bMay 9Oct 3
Thornton6aMay 2Oct 11
Welby6aMay 2Oct 11
Westminster6aMay 2Oct 11
Wheat Ridge6aMay 5Oct 5
Windsor5bMay 3Oct 6

Cities with 10,000+ residents. Data: USDA Plant Hardiness Zone Map 2023 and NOAA Climate Normals 1991–2020. Sources and method.