New Hampshire has 7 USDA hardiness zones from 3b to 6b, with average winter lows from -35°F at Mount Washington’s Presidential Range in Coos County to -5°F along Rockingham County’s southeastern Atlantic coast, per the 2023 USDA Plant Hardiness Zone Map.
Coos County’s White Mountains cover zones 3b–5b, with Mount Washington’s Presidential Range at zone 3b the state’s coldest USDA classification. Carroll, Sullivan, Belknap, and Merrimack Counties span zones 4b–6a across central New Hampshire’s lakes and uplands.
Hillsborough County warms to zones 5b–6a with Nashua at zone 6a, while Durham at zone 6a and Portsmouth at zone 6a anchor the Seacoast in Strafford and Rockingham Counties. Rockingham’s Atlantic coastline extends to zone 6b — New Hampshire’s warmest USDA zone.
New Hampshire’s hardiness zones are also called planting zones, growing zones, plant zones, USDA zones, climate zones, or gardening zones.
Use the city, town, and county lists below, search by ZIP code, or open the interactive New Hampshire planting zones map for precise USDA zone locations.
New Hampshire Planting Zones by ZIP Code
New Hampshire Planting Zones Map
Planting Zones
Planting Zones
USDA Hardiness Zones for New Hampshire Counties
| New Hampshire Counties | Hardiness Zones |
|---|---|
| Belknap County | Zone 5a, 5b and 6a |
| Carroll County | Zone 4b, 5a and 5b |
| Coos County | Zone 3b, 4a, 4b, 5a and 5b |
| Hillsborough County | Zone 5b and 6a |
| Merrimack County | Zone 5a, 5b and 6a |
| Rockingham County | Zone 5b, 6a and 6b |
| Strafford County | Zone 5b and 6a |
| Sullivan County | Zone 5a, 5b and 6a |
USDA Hardiness Zones for New Hampshire Cities and Towns
| New Hampshire Cities/Towns | Hardiness Zones |
|---|---|
| Alton | Zone 5b |
| Amherst | Zone 6a |
| Antrim | Zone 5b and 6a |
| Ashland | Zone 5b |
| Bartlett | Zone 5a |
| Belmont | Zone 5b |
| Bennington | Zone 5b |
| Berlin | Zone 4b, 5a and 5b |
| Bethlehem | Zone 4b and 5a |
| Blodgett Landing | Zone 5b and 6a |
| Bradford | Zone 5b |
| Bristol | Zone 5a and 5b |
| Canaan | Zone 5a |
| Center Ossipee | Zone 5a and 5b |
| Center Sandwich | Zone 5b |
| Charlestown | Zone 5b |
| Claremont | Zone 5a, 5b and 6a |
| Colebrook | Zone 4a |
| Concord | Zone 5b and 6a |
| Contoocook | Zone 5b |
| Conway | Zone 5a |
| Derry | Zone 6a |
| Dover | Zone 6a |
| Durham | Zone 6a |
| East Merrimack | Zone 6a |
| Enfield | Zone 5a |
| Epping | Zone 6a |
| Exeter | Zone 6a |
| Farmington | Zone 5b and 6a |
| Franklin | Zone 5b and 6a |
| Goffstown | Zone 6a |
| Gorham | Zone 5a |
| Greenville | Zone 6a |
| Groveton | Zone 4a and 4b |
| Hampton | Zone 6a and 6b |
| Hampton Beach | Zone 6b |
| Hancock | Zone 5b and 6a |
| Hanover | Zone 5a |
| Henniker | Zone 5b |
| Hillsborough | Zone 5b |
| Hinsdale | Zone 5b and 6a |
| Hooksett | Zone 6a |
| Hudson | Zone 6a |
| Jaffrey | Zone 5b and 6a |
| Keene | Zone 5b and 6a |
| Laconia | Zone 5b and 6a |
| Lancaster | Zone 4a and 4b |
| Lebanon | Zone 5a and 5b |
| Lisbon | Zone 4b and 5a |
| Littleton | Zone 4b and 5a |
| Londonderry | Zone 6a |
| Loudon | Zone 5b |
| Manchester | Zone 5b and 6a |
| Marlborough | Zone 5b and 6a |
| Melvin Village | Zone 5b |
| Meredith | Zone 5b |
| Milford | Zone 6a |
| Milton | Zone 5b |
| Milton Mills | Zone 5b |
| Mountain Lakes | Zone 5a |
| Nashua | Zone 6a |
| New Hampton | Zone 5b |
| New London | Zone 5b and 6a |
| Newfields | Zone 6a |
| Newport | Zone 5a, 5b and 6a |
| North Conway | Zone 5a and 5b |
| North Haverhill | Zone 4b and 5a |
| North Walpole | Zone 5b |
| North Woodstock | Zone 5a and 5b |
| Peterborough | Zone 5b and 6a |
| Pinardville | Zone 6a |
| Pittsfield | Zone 5b |
| Plainfield | Zone 5a |
| Plymouth | Zone 5a and 5b |
| Portsmouth | Zone 6a |
| Raymond | Zone 6a |
| Rochester | Zone 5b and 6a |
| Sanbornville | Zone 5b |
| Seabrook Beach | Zone 6b |
| Somersworth | Zone 6a |
| Suissevale | Zone 5b |
| Suncook | Zone 5b and 6a |
| Tilton Northfield | Zone 5b |
| Troy | Zone 5b and 6a |
| Union | Zone 5b |
| Walpole | Zone 5b and 6a |
| Warner | Zone 5b |
| West Stewartstown | Zone 4a |
| West Swanzey | Zone 5b |
| Whitefield | Zone 4b |
| Wilton | Zone 6a |
| Winchester | Zone 5b |
| Wolfeboro | Zone 5b |
| Woodsville | Zone 4b and 5a |