Montgomery County, Maryland
Local growing conditions for Montgomery County: the USDA hardiness zones found here, frost dates, and live weather for communities across the county. Based on 48 ZIP codes in our data.
Hardiness zones in Montgomery County
Montgomery County spans these USDA plant hardiness zones (by number of ZIP codes):
Local weather & frost dates
Open any community in Montgomery County for its live forecast, frost dates, and planting calendar:
Bethesda 20816
Brookmont 20812
Bethesda 20814
Chevy Chase 20815
Bethesda 20817
Cabin John 20818
Olney 20832
Brookeville 20833
Poolesville 20837
Barnesville 20838
Poolesville 20839
Germantown 20841
Barnesville 20842
Rockville 20850
Rockville 20851
North Bethesda 20852
Aspen Hill 20853
Travilah 20854
Redland 20855
Ashton-Sandy Spring 20860
Ashton-Sandy Spring 20861
Ashton-Sandy Spring 20862
Burtonsville 20866
Burtonsville 20868
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.