Merrimack County, New Hampshire
Local growing conditions for Merrimack County: the USDA hardiness zones found here, frost dates, and live weather for communities across the county. Based on 28 ZIP codes in our data.
Hardiness zones in Merrimack County
Merrimack County spans these USDA plant hardiness zones (by number of ZIP codes):
Local weather & frost dates
Open any community in Merrimack County for its live forecast, frost dates, and planting calendar:
Concord 03046
Hooksett 03106
Franklin 03216
Bradford 03221
Concord 03224
Contoocook 03229
Bristol 03230
Franklin 03231
New London 03233
Pittsfield 03234
Franklin 03235
Henniker 03242
Franklin 03243
Bradford 03255
New London 03257
Loudon 03258
New London 03260
Pittsfield 03263
Franklin 03268
Bradford 03273
Suncook 03275
Tilton Northfield 03276
Warner 03278
New London 03287
More for New Hampshire
- Agriculture in New Hampshire
- Frost dates across New Hampshire
- USDA hardiness zones explained
- Planting calendar by ZIP code
← All counties in New Hampshire
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.