Jefferson County, Colorado
Local growing conditions for Jefferson County: the USDA hardiness zones found here, frost dates, and live weather for communities across the county. Based on 27 ZIP codes in our data.
Hardiness zones in Jefferson County
Jefferson County spans these USDA plant hardiness zones (by number of ZIP codes):
Local weather & frost dates
Open any community in Jefferson County for its live forecast, frost dates, and planting calendar:
Wheat Ridge 80033
Denver 80123
Lakewood 80215
Kittredge 80457
Arvada 80002
Arvada 80003
Arvada 80004
Arvada 80005
Arvada 80007
Westminster 80021
Ken Caryl 80127
Columbine 80128
Lakewood 80214
Lakewood 80226
Lakewood 80227
Lakewood 80228
Lakewood 80232
Lakewood 80235
Golden 80401
Arvada 80403
Golden 80419
Roxborough Park 80425
Aspen Park 80433
Idledale 80453
More for Colorado
- Agriculture in Colorado
- Frost dates across Colorado
- USDA hardiness zones explained
- Planting calendar by ZIP code
County growing conditions are compiled from our ZIP-code database, USDA hardiness-zone data, and NOAA climate normals. Conditions vary within a county by elevation and local microclimate. Page updated Aug 4, 2026.