USDA Hardiness Zone Map For Connecticut - The Garden Magazine
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Part of successfully growing a garden is knowing your USDA hardiness planting zone. USDA plant hardiness zones are the standard by which gardeners and growers can determine which plants are most likely to thrive at any given location. Some plants are able to survive outside of their hardiness zone, but can only survive for one growing season and are therefore considered annuals.
Connecticut’s plant hardiness planting zones range from 5b, where winter temperatures can drop as low as -15 degrees Fahrenheit, to a slightly milder 6b, where winter temperatures only drop to -5 degrees Fahrenheit.
USDA Hardiness Planting Zone Map For Connecticut
Above is the USDA hardiness zone map for all of Connecticut.
USDA Hardiness Zones For All Cities In Connecticut
Below is a table of the USDA hardiness zones for all towns and cities in the state of Connecticut.
| Cities in Connecticut | Connecticut Hardiness Zones (1990 Data) |
|---|---|
| Abington | Zone 5b: -15°F to -10°F |
| Amston | Zone 6a: -10°F to -5°F |
| Andover | Zone 5b: -15°F to -10°F |
| Ansonia | Zone 6a: -10°F to -5°F |
| Ashford | Zone 5b: -15°F to -10°F |
| Avon | Zone 6a: -10°F to -5°F |
| Ballouville | Zone 5b: -15°F to -10°F |
| Baltic | Zone 6a: -10°F to -5°F |
| Bantam | Zone 5b: -15°F to -10°F |
| Barkhamsted | Zone 5b: -15°F to -10°F |
| Beacon Falls | Zone 6a: -10°F to -5°F |
| Bethany | Zone 6a: -10°F to -5°F |
| Bethel | Zone 6a: -10°F to -5°F |
| Bethlehem | Zone 5b: -15°F to -10°F |
| Bethlehem Village | Zone 5b: -15°F to -10°F |
| Bloomfield | Zone 6a: -10°F to -5°F |
| Blue Hills | Zone 6a: -10°F to -5°F |
| Bolton | Zone 5b: -15°F to -10°F |
| Botsford | Zone 6a: -10°F to -5°F |
| Bozrah | Zone 6a: -10°F to -5°F |
| Branford | Zone 6b: -5°F to 0°F |
| Branford Center | Zone 6b: -5°F to 0°F |
| Bridgeport | Zone 6b: -5°F to 0°F |
| Bridgewater | Zone 5b: -15°F to -10°F |
| Bristol | Zone 6a: -10°F to -5°F |
| Broad Brook | Zone 5b: -15°F to -10°F |
| Brookfield | Zone 6a: -10°F to -5°F |
| Brooklyn | Zone 6a: -10°F to -5°F |
| Burlington | Zone 6a: -10°F to -5°F |
| Byram | Zone 6b: -5°F to 0°F |
| Canaan | Zone 5b: -15°F to -10°F |
| Cannondale | Zone 6b: -5°F to 0°F |
| Canterbury | Zone 6a: -10°F to -5°F |
| Canton | Zone 6a: -10°F to -5°F |
| Canton Center | Zone 6a: -10°F to -5°F |
| Canton Valley | Zone 6a: -10°F to -5°F |
| Centerbrook | Zone 6a: -10°F to -5°F |
| Central Manchester | Zone 5b: -15°F to -10°F |
| Central Somers | Zone 5b: -15°F to -10°F |
| Central Village | Zone 6a: -10°F to -5°F |
| Central Waterford | Zone 6a: -10°F to -5°F |
| Chaplin | Zone 5b: -15°F to -10°F |
| Cheshire | Zone 6a: -10°F to -5°F |
| Cheshire Village | Zone 6a: -10°F to -5°F |
| Chester | Zone 6a: -10°F to -5°F |
| Chester Center | Zone 6a: -10°F to -5°F |
| Clinton | Zone 6b: -5°F to 0°F |
| Cobalt | Zone 6a: -10°F to -5°F |
| Colchester | Zone 6a: -10°F to -5°F |
| Colebrook | Zone 5b: -15°F to -10°F |
| Collinsville | Zone 6a: -10°F to -5°F |
| Columbia | Zone 5b: -15°F to -10°F |
| Conning Towers-Nautilus Park | Zone 6a: -10°F to -5°F |
| Cornwall | Zone 5b: -15°F to -10°F |
| Cornwall Bridge | Zone 5b: -15°F to -10°F |
| Cos Cob | Zone 6b: -5°F to 0°F |
| Coventry | Zone 5b: -15°F to -10°F |
| Coventry Lake | Zone 5b: -15°F to -10°F |
| Cromwell | Zone 6a: -10°F to -5°F |
| Crystal Lake | Zone 5b: -15°F to -10°F |
| Danbury | Zone 6a: -10°F to -5°F |
| Danielson | Zone 6a: -10°F to -5°F |
| Darien | Zone 6b: -5°F to 0°F |
| Dayville | Zone 6a: -10°F to -5°F |
| Deep River | Zone 6a: -10°F to -5°F |
| Deep River Center | Zone 6a: -10°F to -5°F |
| Derby | Zone 6a: -10°F to -5°F |
| Durham | Zone 6a: -10°F to -5°F |
| East Berlin | Zone 6a: -10°F to -5°F |
| East Brooklyn | Zone 6a: -10°F to -5°F |
| East Canaan | Zone 5b: -15°F to -10°F |
| East Glastonbury | Zone 5b: -15°F to -10°F |
| East Granby | Zone 6a: -10°F to -5°F |
| East Haddam | Zone 6a: -10°F to -5°F |
| East Hampton | Zone 6a: -10°F to -5°F |
| East Hartford | Zone 6a: -10°F to -5°F |
| East Hartland | Zone 5b: -15°F to -10°F |
| East Haven | Zone 6b: -5°F to 0°F |
| East Killingly | Zone 6a: -10°F to -5°F |
| East Lyme | Zone 6a: -10°F to -5°F |
| East Norwalk | Zone 6b: -5°F to 0°F |
| East Windsor | Zone 5b: -15°F to -10°F |
| East Windsor Hill | Zone 6a: -10°F to -5°F |
| East Woodstock | Zone 5b: -15°F to -10°F |
| Eastford | Zone 5b: -15°F to -10°F |
| Easton | Zone 6b: -5°F to 0°F |
| Ellington | Zone 5b: -15°F to -10°F |
| Enfield | Zone 5b: -15°F to -10°F |
| Essex | Zone 6a: -10°F to -5°F |
| Essex Village | Zone 6a: -10°F to -5°F |
| Fabyan | Zone 5b: -15°F to -10°F |
| Fairfield | Zone 6b: -5°F to 0°F |
| Falls Village | Zone 5b: -15°F to -10°F |
| Farmington | Zone 6a: -10°F to -5°F |
| Fenwick | Zone 6b: -5°F to 0°F |
| Gales Ferry | Zone 6a: -10°F to -5°F |
| Gaylordsville | Zone 5b: -15°F to -10°F |
| Georgetown | Zone 6b: -5°F to 0°F |
| Gilman | Zone 6a: -10°F to -5°F |
| Glasgo | Zone 6a: -10°F to -5°F |
| Glastonbury | Zone 6a: -10°F to -5°F |
| Glastonbury Center | Zone 6a: -10°F to -5°F |
| Glenville | Zone 6b: -5°F to 0°F |
| Goshen | Zone 5b: -15°F to -10°F |
| Granby | Zone 6a: -10°F to -5°F |
| Greens Farms | Zone 6b: -5°F to 0°F |
| Greenwich | Zone 6b: -5°F to 0°F |
| Grosvenor Dale | Zone 5b: -15°F to -10°F |
| Groton | Zone 6a: -10°F to -5°F |
| Groton Long Point | Zone 6a: -10°F to -5°F |
| Guilford | Zone 6b: -5°F to 0°F |
| Guilford Center | Zone 6b: -5°F to 0°F |
| Haddam | Zone 6a: -10°F to -5°F |
| Hadlyme | Zone 6a: -10°F to -5°F |
| Hamden | Zone 6a: -10°F to -5°F |
| Hampton | Zone 5b: -15°F to -10°F |
| Hanover | Zone 6a: -10°F to -5°F |
| Hartford | Zone 6a: -10°F to -5°F |
| Harwinton | Zone 6a: -10°F to -5°F |
| Hawleyville | Zone 6a: -10°F to -5°F |
| Hazardville | Zone 5b: -15°F to -10°F |
| Hebron | Zone 5b: -15°F to -10°F |
| Heritage Village | Zone 6a: -10°F to -5°F |
| Higganum | Zone 6a: -10°F to -5°F |
| Ivoryton | Zone 6a: -10°F to -5°F |
| Jewett City | Zone 6a: -10°F to -5°F |
| Kensington | Zone 6a: -10°F to -5°F |
| Kent | Zone 5b: -15°F to -10°F |
| Killingly Center | Zone 6a: -10°F to -5°F |
| Killingworth | Zone 6a: -10°F to -5°F |
| Lake Pocotopaug | Zone 6a: -10°F to -5°F |
| Lakeside | Zone 5b: -15°F to -10°F |
| Lakeville | Zone 5b: -15°F to -10°F |
| Lebanon | Zone 6a: -10°F to -5°F |
| Ledyard | Zone 6a: -10°F to -5°F |
| Lisbon | Zone 6a: -10°F to -5°F |
| Litchfield | Zone 5b: -15°F to -10°F |
| Long Hill | Zone 6a: -10°F to -5°F |
| Madison | Zone 6b: -5°F to 0°F |
| Madison Center | Zone 6b: -5°F to 0°F |
| Manchester | Zone 5b: -15°F to -10°F |
| Mansfield Center | Zone 5b: -15°F to -10°F |
| Mansfield City | Zone 5b: -15°F to -10°F |
| Mansfield Depot | Zone 5b: -15°F to -10°F |
| Marion | Zone 6a: -10°F to -5°F |
| Marlborough | Zone 6a: -10°F to -5°F |
| Mashantucket | Zone 6a: -10°F to -5°F |
| Melrose | Zone 5b: -15°F to -10°F |
| Meriden | Zone 6a: -10°F to -5°F |
| Middle Haddam | Zone 6a: -10°F to -5°F |
| Middlebury | Zone 6a: -10°F to -5°F |
| Middlefield | Zone 6a: -10°F to -5°F |
| Middletown | Zone 6a: -10°F to -5°F |
| Milford | Zone 6b: -5°F to 0°F |
| Milldale | Zone 6a: -10°F to -5°F |
| Mohawk Mountain Ski Area | Zone 5b: -15°F to -10°F |
| Monroe | Zone 6a: -10°F to -5°F |
| Montville | Zone 6a: -10°F to -5°F |
| Moodus | Zone 6a: -10°F to -5°F |
| Moosup | Zone 6a: -10°F to -5°F |
| Morris | Zone 5b: -15°F to -10°F |
| Mystic | Zone 6a: -10°F to -5°F |
| Naugatuck | Zone 6a: -10°F to -5°F |
| New Britain | Zone 6a: -10°F to -5°F |
| New Canaan | Zone 6b: -5°F to 0°F |
| New Fairfield | Zone 6a: -10°F to -5°F |
| New Hartford | Zone 6a: -10°F to -5°F |
| New Hartford Center | Zone 6a: -10°F to -5°F |
| New Haven | Zone 6b: -5°F to 0°F |
| New London | Zone 6a: -10°F to -5°F |
| New Milford | Zone 5b: -15°F to -10°F |
| New Preston | Zone 5b: -15°F to -10°F |
| Newington | Zone 6a: -10°F to -5°F |
| Newtown | Zone 6a: -10°F to -5°F |
| Niantic | Zone 6a: -10°F to -5°F |
| Noank | Zone 6a: -10°F to -5°F |
| Norfolk | Zone 5b: -15°F to -10°F |
| North Branford | Zone 6b: -5°F to 0°F |
| North Canton | Zone 6a: -10°F to -5°F |
| North Franklin | Zone 6a: -10°F to -5°F |
| North Granby | Zone 6a: -10°F to -5°F |
| North Grosvenor Dale | Zone 5b: -15°F to -10°F |
| North Haven | Zone 6a: -10°F to -5°F |
| North Stamford | Zone 6b: -5°F to 0°F |
| North Stonington | Zone 6a: -10°F to -5°F |
| North Westchester | Zone 6a: -10°F to -5°F |
| North Windham | Zone 5b: -15°F to -10°F |
| Northfield | Zone 5b: -15°F to -10°F |
| Northford | Zone 6a: -10°F to -5°F |
| Northwest Harwinton | Zone 5b: -15°F to -10°F |
| Norwalk | Zone 6b: -5°F to 0°F |
| Norwich | Zone 6a: -10°F to -5°F |
| Oakdale | Zone 6a: -10°F to -5°F |
| Oakville | Zone 6a: -10°F to -5°F |
| Old Greenwich | Zone 6b: -5°F to 0°F |
| Old Lyme | Zone 6a: -10°F to -5°F |
| Old Mystic | Zone 6a: -10°F to -5°F |
| Old Saybrook | Zone 6a: -10°F to -5°F |
| Old Saybrook Center | Zone 6a: -10°F to -5°F |
| Oneco | Zone 6a: -10°F to -5°F |
| Orange | Zone 6b: -5°F to 0°F |
| Oxford | Zone 6a: -10°F to -5°F |
| Oxoboxo River | Zone 6a: -10°F to -5°F |
| Pawcatuck | Zone 6a: -10°F to -5°F |
| Pemberwick | Zone 6b: -5°F to 0°F |
| Pequabuck | Zone 6a: -10°F to -5°F |
| Pine Meadow | Zone 6a: -10°F to -5°F |
| Plainfield | Zone 6a: -10°F to -5°F |
| Plainfield Village | Zone 6a: -10°F to -5°F |
| Plainville | Zone 6a: -10°F to -5°F |
| Plantsville | Zone 6a: -10°F to -5°F |
| Pleasant Valley | Zone 5b: -15°F to -10°F |
| Plymouth | Zone 6a: -10°F to -5°F |
| Pomfret | Zone 5b: -15°F to -10°F |
| Pomfret Center | Zone 5b: -15°F to -10°F |
| Poquonock | Zone 6a: -10°F to -5°F |
| Poquonock Bridge | Zone 6a: -10°F to -5°F |
| Portland | Zone 6a: -10°F to -5°F |
| Powder Ridge Ski Resort | Zone 6a: -10°F to -5°F |
| Preston | Zone 6a: -10°F to -5°F |
| Prospect | Zone 6a: -10°F to -5°F |
| Putnam | Zone 5b: -15°F to -10°F |
| Quaker Hill | Zone 6a: -10°F to -5°F |
| Quinebaug | Zone 5b: -15°F to -10°F |
| Redding | Zone 6a: -10°F to -5°F |
| Redding Ridge | Zone 6a: -10°F to -5°F |
| Ridgefield | Zone 6b: -5°F to 0°F |
| Riverside | Zone 6b: -5°F to 0°F |
| Riverton | Zone 5b: -15°F to -10°F |
| Rockfall | Zone 6a: -10°F to -5°F |
| Rockville | Zone 5b: -15°F to -10°F |
| Rocky Hill | Zone 6a: -10°F to -5°F |
| Rogers | Zone 6a: -10°F to -5°F |
| Roxbury | Zone 5b: -15°F to -10°F |
| Salem | Zone 6a: -10°F to -5°F |
| Salisbury | Zone 5b: -15°F to -10°F |
| Salmon Brook | Zone 6a: -10°F to -5°F |
| Sandy Hook | Zone 6a: -10°F to -5°F |
| Saybrook Manor | Zone 6a: -10°F to -5°F |
| Scotland | Zone 6a: -10°F to -5°F |
| Seymour | Zone 6a: -10°F to -5°F |
| Sharon | Zone 5b: -15°F to -10°F |
| Shelton | Zone 6a: -10°F to -5°F |
| Sherman | Zone 5b: -15°F to -10°F |
| Sherwood Manor | Zone 5b: -15°F to -10°F |
| Simsbury | Zone 6a: -10°F to -5°F |
| Simsbury Center | Zone 6a: -10°F to -5°F |
| Ski Sundown Ski Area | Zone 6a: -10°F to -5°F |
| Somers | Zone 5b: -15°F to -10°F |
| Somersville | Zone 5b: -15°F to -10°F |
| South Britain | Zone 6a: -10°F to -5°F |
| South Coventry | Zone 5b: -15°F to -10°F |
| South Glastonbury | Zone 6a: -10°F to -5°F |
| South Kent | Zone 5b: -15°F to -10°F |
| South Lyme | Zone 6a: -10°F to -5°F |
| South Willington | Zone 5b: -15°F to -10°F |
| South Windham | Zone 6a: -10°F to -5°F |
| South Windsor | Zone 6a: -10°F to -5°F |
| South Woodstock | Zone 5b: -15°F to -10°F |
| Southbury | Zone 6a: -10°F to -5°F |
| Southington | Zone 6a: -10°F to -5°F |
| Southport | Zone 6b: -5°F to 0°F |
| Southwood Acres | Zone 5b: -15°F to -10°F |
| Stafford | Zone 5b: -15°F to -10°F |
| Stafford Springs | Zone 5b: -15°F to -10°F |
| Staffordville | Zone 5b: -15°F to -10°F |
| Stamford | Zone 6b: -5°F to 0°F |
| Sterling | Zone 6a: -10°F to -5°F |
| Stevenson | Zone 6a: -10°F to -5°F |
| Stonington | Zone 6a: -10°F to -5°F |
| Storrs | Zone 5b: -15°F to -10°F |
| Stratford | Zone 6b: -5°F to 0°F |
| Suffield | Zone 6a: -10°F to -5°F |
| Suffield Depot | Zone 6a: -10°F to -5°F |
| Taconic | Zone 5b: -15°F to -10°F |
| Taftville | Zone 6a: -10°F to -5°F |
| Tariffville | Zone 6a: -10°F to -5°F |
| Terramuggus | Zone 6a: -10°F to -5°F |
| Terryville | Zone 6a: -10°F to -5°F |
| Thomaston | Zone 6a: -10°F to -5°F |
| Thompson | Zone 5b: -15°F to -10°F |
| Thompsonville | Zone 5b: -15°F to -10°F |
| Tolland | Zone 5b: -15°F to -10°F |
| Torrington | Zone 5b: -15°F to -10°F |
| Trumbull | Zone 6b: -5°F to 0°F |
| Uncasville | Zone 6a: -10°F to -5°F |
| Unionville | Zone 6a: -10°F to -5°F |
| Vernon Rockville | Zone 5b: -15°F to -10°F |
| Versailles | Zone 6a: -10°F to -5°F |
| Voluntown | Zone 6a: -10°F to -5°F |
| Wallingford | Zone 6a: -10°F to -5°F |
| Wallingford Center | Zone 6a: -10°F to -5°F |
| Washington | Zone 5b: -15°F to -10°F |
| Washington Depot | Zone 5b: -15°F to -10°F |
| Waterbury | Zone 6a: -10°F to -5°F |
| Waterford | Zone 6a: -10°F to -5°F |
| Watertown | Zone 6a: -10°F to -5°F |
| Wauregan | Zone 6a: -10°F to -5°F |
| Weatogue | Zone 6a: -10°F to -5°F |
| West Cornwall | Zone 5b: -15°F to -10°F |
| West Granby | Zone 6a: -10°F to -5°F |
| West Hartford | Zone 6a: -10°F to -5°F |
| West Hartland | Zone 5b: -15°F to -10°F |
| West Haven | Zone 6b: -5°F to 0°F |
| West Mystic | Zone 6a: -10°F to -5°F |
| West Simsbury | Zone 6a: -10°F to -5°F |
| West Suffield | Zone 6a: -10°F to -5°F |
| West Torrington | Zone 5b: -15°F to -10°F |
| Westbrook | Zone 6a: -10°F to -5°F |
| Westbrook Center | Zone 6a: -10°F to -5°F |
| Weston | Zone 6b: -5°F to 0°F |
| Westport | Zone 6b: -5°F to 0°F |
| Wethersfield | Zone 6a: -10°F to -5°F |
| Willimantic | Zone 5b: -15°F to -10°F |
| Willington Hill | Zone 5b: -15°F to -10°F |
| Wilton | Zone 6b: -5°F to 0°F |
| Winchester Center | Zone 5b: -15°F to -10°F |
| Windham | Zone 6a: -10°F to -5°F |
| Windsor | Zone 6a: -10°F to -5°F |
| Windsor Locks | Zone 6a: -10°F to -5°F |
| Winsted | Zone 5b: -15°F to -10°F |
| Wolcott | Zone 6a: -10°F to -5°F |
| Woodbridge | Zone 6a: -10°F to -5°F |
| Woodbury | Zone 5b: -15°F to -10°F |
| Woodbury Center | Zone 5b: -15°F to -10°F |
| Woodbury Ski Area | Zone 5b: -15°F to -10°F |
| Woodmont | Zone 6b: -5°F to 0°F |
| Woodstock | Zone 5b: -15°F to -10°F |
| Woodstock Valley | Zone 5b: -15°F to -10°F |
| Yantic | Zone 6a: -10°F to -5°F |
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