Howard County, Maryland
Local growing conditions for Howard County: the USDA hardiness zones found here, frost dates, and live weather for communities across the county. Based on 20 ZIP codes in our data.
Hardiness zones in Howard County
Howard County spans these USDA plant hardiness zones (by number of ZIP codes):
Local weather & frost dates
Open any community in Howard County for its live forecast, frost dates, and planting calendar:
Jessup 20701
North Laurel 20723
Fulton 20759
Savage 20763
Highland 20777
Jessup 20794
Columbia 21029
Highland 21036
Ellicott City 21042
Ellicott City 21043
Columbia 21044
Columbia 21045
Columbia 21046
Elkridge 21075
Eldersburg 21104
Eldersburg 21723
Brookeville 21737
Lisbon 21738
Ellicott City 21794
Lisbon 21797
More for Maryland
- Agriculture in Maryland
- Frost dates across Maryland
- 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.