Penobscot County, Maine
Local growing conditions for Penobscot County: the USDA hardiness zones found here, frost dates, and live weather for communities across the county. Based on 41 ZIP codes in our data.
Hardiness zones in Penobscot County
Penobscot County spans these USDA plant hardiness zones (by number of ZIP codes):
Local weather & frost dates
Open any community in Penobscot County for its live forecast, frost dates, and planting calendar:
Orono 04469
Old Town 04489
Bangor 04401
Old Town 04410
Bradley 04411
Brewer 04412
Lincoln 04417
Howland 04418
Hampden 04419
Dover-Foxcroft 04422
Old Town 04427
Brewer 04428
East Millinocket 04430
Newport 04434
Corinna 04435
Hampden 04444
Howland 04448
Old Town 04449
Bangor 04450
Howland 04453
Lincoln 04455
Bangor 04456
Lincoln 04457
East Millinocket 04460
More for Maine
- Agriculture in Maine
- Frost dates across Maine
- 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.