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Connecticut Planting Zones
Connecticut covers USDA hardiness zones 6a to 7b on the 2023 map. The most common zone is 6b (60% of ZIP codes), where the coldest winter night averages -5 to 0 °F. Hartford is zone 6b, New Haven is zone 6b–7a and Waterbury is zone 6b.
Zones in Connecticut
Share of the state’s ZIP codes in each zone.
Major cities
- Hartford 6b
- New Haven 6b–7a
- Waterbury 6b
- Stamford 7a
- Bridgeport 7a
- Norwalk 7a–7b
- West Hartford 6b
- East Hartford 6b
- Manchester 6b
- New Britain 6b
- Wallingford 6b
- Westport 7a
Every city and town in Connecticut
- Amston 06231 6b
- Andover 06232 6b
- Ansonia 06401 6b
- Ashford 06278 6b
- Avon 06001 6b
- Ballouville 06233 6b
- Baltic 06330 6b
- Bantam 06750 6a
- Barkhamsted 06063 6a
- Beacon Falls 06403 6b
- Berlin 06037 6b
- Bethany 06524 6b
- Bethel 06801 6b
- Bethlehem 06751 6a
- Bloomfield 06002 6b
- Bolton 06043 6b
- Botsford 06404 6b
- Bozrah 06334 6b
- Branford 06405 7a
- Bridgeport 06601+ 7a
- Bridgewater 06752 6b
- Bristol 06010+ 6b
- Broad Brook 06016 6b
- Brookfield 06804 6b
- Brooklyn 06234 6b
- Burlington 06013 6a
- Canaan 06018 6a
- Canterbury 06331 6b
- Canton 06019 6a
- Canton Center 06020 6a
- Centerbrook 06409 7a
- Central Village 06332 6b
- Chaplin 06235 6b
- Cheshire 06408+ 6b
- Chester 06412 6b
- Clinton 06413 7a
- Cobalt 06414 6b
- Colchester 06415 6b
- Colebrook 06021 6a
- Collinsville 06022 6a
- Columbia 06237 6b
- Cornwall 06753 6a
- Cornwall Bridge 06754 6a
- Cos Cob 06807 7a
- Coventry 06238 6b
- Cromwell 06416 6b
- Danbury 06810+ 6b
- Danielson 06239 6b
- Darien 06820 7a
- Dayville 06241 6b
- Deep River 06417 7a
- Derby 06418 6b
- Durham 06422 6b
- East Berlin 06023 6b
- East Canaan 06024 6a
- East Glastonbury 06025 6b
- East Granby 06026 6b
- East Haddam 06423 6b
- East Hampton 06424 6b
- East Hartford 06108+ 6b
- East Hartland 06027 6a
- East Killingly 06243 6b
- East Lyme 06333 7a
- East Windsor 06088 6b
- East Windsor Hill 06028 6b
- East Woodstock 06244 6a
- Eastford 06242 6b
- Easton 06612 6b
- Ellington 06029 6b
- Enfield 06082+ 6b
- Essex 06426 7a
- Fabyan 06245 6a
- Fairfield 06824+ 7a
- Falls Village 06031 6a
- Farmington 06030+ 6b
- Gales Ferry 06335 7a
- Gaylordsville 06755 6b
- Georgetown 06829 7a
- Gilman 06336 6b
- Glastonbury 06033 6b
- Goshen 06756 6a
- Granby 06035 6b
- Greens Farms 06838 7a
- Greenwich 06830+ 7a
- Grosvenor Dale 06246 6a
- Groton 06340 7a
- Guilford 06437 7a
- Haddam 06438 6b
- Hadlyme 06439 6b
- Hamden 06514+ 6b–7a
- Hampton 06247 6b
- Hanover 06350 6b
- Hartford 06101+ 6b
- Harwinton 06791 6a
- Hawleyville 06440 6b
- Hebron 06248 6b
- Higganum 06441 6b
- Ivoryton 06442 7a
- Jewett City 06351 6b
- Kent 06757 6a
- Killingworth 06419 6b
- Lakeside 06758 6a
- Lakeville 06039 6a
- Lebanon 06249 6b
- Ledyard 06339 6b
- Litchfield 06759 6a
- Madison 06443 7a
- Manchester 06040+ 6b
- Mansfield Center 06250 6b
- Mansfield Depot 06251 6b
- Marion 06444 6b
- Marlborough 06447 6b
- Mashantucket 06338 6b
- Meriden 06450+ 6b
- Middle Haddam 06456 6b
- Middlebury 06762 6b
- Middlefield 06455 6b
- Middletown 06457+ 6b
- Milford 06460+ 7a
- Milldale 06467 6b
- Monroe 06468 6b
- Moodus 06469 6b
- Moosup 06354 6b
- Morris 06763 6a
- Mystic 06355 7a
- Naugatuck 06770 6b
- New Britain 06050+ 6b
- New Canaan 06840 7a
- New Fairfield 06812 6b
- New Hartford 06057 6a
- New Haven 06501+ 6b–7a
- New London 06320 7a
- New Milford 06776 6b
- New Preston Marble Dale 06777 6a
- Newington 06111+ 6b
- Newtown 06470 6b
- Niantic 06357 7a
- Norfolk 06058 6a
- North Branford 06471 7a
- North Canton 06059 6a
- North Franklin 06254 6b
- North Granby 06060 6a
- North Grosvenordale 06255 6a
- North Haven 06473 6b
- North Stonington 06359 6b
- North Westchester 06474 6b
- North Windham 06256 6b
- Northfield 06778 6a
- Northford 06472 6b
- Norwalk 06850+ 7a–7b
- Norwich 06360 6b
- Oakdale 06370 6b
- Oakville 06779 6b
- Old Greenwich 06870 7b
- Old Lyme 06371 7a
- Old Mystic 06372 7a
- Old Saybrook 06475 7a
- Oneco 06373 6b
- Orange 06477 7a
- Oxford 06478 6b
- Pawcatuck 06379 7a
- Pequabuck 06781 6b
- Pine Meadow 06061 6a
- Plainfield 06374 6b
- Plainville 06062 6b
- Plantsville 06479 6b
- Plymouth 06782 6a
- Pomfret Center 06259 6b
- Poquonock 06064 6b
- Portland 06480 6b
- Preston 06365 6b
- Prospect 06712 6b
- Putnam 06260 6b
- Quaker Hill 06375 7a
- Quinebaug 06262 6a
- Redding 06896 6b
- Redding Center 06875 6b
- Redding Ridge 06876 6b
- Ridgefield 06877+ 6b
- Riverside 06878 7b
- Riverton 06065 6a
- Rockfall 06481 6b
- Rocky Hill 06067 6b
- Rogers 06263 6b
- Roxbury 06783 6b
- Salem 06420 6b
- Salisbury 06068 6a
- Sandy Hook 06482 6b
- Scotland 06264 6b
- Seymour 06483 6b
- Sharon 06069 6a
- Shelton 06484 6b
- Sherman 06784 6b
- Simsbury 06070 6b
- Somers 06071 6b
- Somersville 06072 6b
- South Britain 06487 6b
- South Glastonbury 06073 6b
- South Kent 06785 6a
- South Lyme 06376 7a
- South Willington 06265 6b
- South Windham 06266 6b
- South Windsor 06074 6b
- South Woodstock 06267 6b
- Southbury 06488 6b
- Southington 06489 6b
- Southport 06890 7a
- Stafford 06075 6a
- Stafford Springs 06076 6b
- Staffordville 06077 6a
- Stamford 06901+ 7a
- Sterling 06377 6b
- Stevenson 06491 6b
- Stonington 06378 7a
- Storrs Mansfield 06268+ 6b
- Stratford 06614+ 7a
- Suffield 06078+ 6b
- Taconic 06079 6a
- Taftville 06380 6b
- Tariffville 06081 6b
- Terryville 06786 6b
- Thomaston 06787 6a
- Thompson 06277 6b
- Tolland 06084 6b
- Torrington 06790+ 6a
- Trumbull 06611 7a
- Uncasville 06382 6b
- Unionville 06085 6b
- Vernon Rockville 06066 6b
- Versailles 06383 6b
- Voluntown 06384 6b
- Wallingford 06492+ 6b
- Washington 06793 6a
- Washington Depot 06794 6a
- Waterbury 06701+ 6b
- Waterford 06385 7a
- Watertown 06795 6b
- Wauregan 06387 6b
- Weatogue 06089 6b
- West Cornwall 06796 6a
- West Granby 06090 6a
- West Hartford 06107+ 6b
- West Hartland 06091 6a
- West Haven 06516 7a
- West Mystic 06388 7a
- West Simsbury 06092 6b
- West Suffield 06093 6b
- Westbrook 06498 7a
- Weston 06883 7a
- Westport 06880+ 7a
- Wethersfield 06109+ 6b–7a
- Willimantic 06226 6b
- Willington 06279 6b
- Wilton 06897 7a
- Winchester Center 06094 6a
- Windham 06280 6b
- Windsor 06006+ 6b
- Windsor Locks 06096 6b
- Winsted 06098 6a
- Wolcott 06716 6b
- Woodbury 06798 6b
- Woodstock 06281 6b
- Woodstock Valley 06282 6b
- Yantic 06389 6b
Other states
Alabama Alaska Arizona Arkansas California Colorado Delaware District of Columbia Florida Georgia Hawaii Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Jersey New Mexico New York North Carolina North Dakota Ohio Oklahoma Oregon Pennsylvania Puerto Rico Rhode Island South Carolina South Dakota Tennessee Texas Utah Vermont Virginia Washington West Virginia Wisconsin Wyoming
Zones: 2023 USDA Plant Hardiness Zone Map ZIP code data, USDA Agricultural Research Service and the PRISM Climate Group, Oregon State University (official map). Place names: GeoNames (CC BY 4.0). Each ZIP code gets one zone, but a ZIP code can cross a zone line, and hills, valleys and towns can be warmer or colder than the zone shown.
About the Hardiness Zone Map
The Hardiness Zone Map finds your USDA plant hardiness zone, also called your planting or growing zone, from your ZIP code. Zones are based on the average coldest winter night of the year: each zone is 10 °F wide and split into a and b halves of 5 °F, from zone 1a in Alaska to 13b in Puerto Rico. Plant labels and seed packets give the coldest zone a plant can survive, so knowing your zone tells you which perennials, shrubs and trees can stay outside all winter. Zones come from the official 2023 USDA map ZIP code data for all 50 states, Washington DC and Puerto Rico.
How to use it
- 1 Enter your 5-digit ZIP code and press Find my zone.
- 2 Read your zone and the average coldest winter temperature it stands for.
- 3 Open your state to see its zones and the zone of every city.
- 4 Choose plants rated for your zone number or a colder (lower) one.
Frequently asked questions
What growing zone is Connecticut?
Connecticut spans zones 6a–7b. Zone 6b is the most common, covering 60% of the state's ZIP codes. Enter your ZIP code above for your exact zone.
What planting zone is Hartford, CT?
Hartford is in USDA zone 6b. Its average coldest winter night is -5 to 0 °F.
What planting zone is New Haven, CT?
New Haven is in USDA zone 6b–7a, depending on the ZIP code. Its average coldest winter night is -5 to 5 °F.
What planting zone is Waterbury, CT?
Waterbury is in USDA zone 6b. Its average coldest winter night is -5 to 0 °F.
What is the coldest zone in Connecticut?
The coldest part of Connecticut is zone 6a, with winter lows of -10 to -5 °F. The warmest is zone 7b, at 5 to 10 °F.
How are planting zones worked out?
Each zone is a 10 °F band of the average coldest winter night over 1991–2020, split into a and b halves of 5 °F. The map does not show summer heat, rainfall or frost dates, so check local advice before planting.
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