Connecticut planting zones
Connecticut spans USDA zones 6a to 7b on the 2023 map; the most common is 6b. The typical last spring frost is around Apr 18 and the first fall frost around Oct 23.
Zone map of Connecticut
Outside Connecticut is dimmed · tap the map for the zone at any spot · scroll or pinch to zoomNot the official USDA Plant Hardiness Zone Map. Zones come from the 2023 USDA hardiness-zone data by the PRISM Group, Oregon State University; we re-mapped and recolored them. The official map is at planthardiness.ars.usda.gov.
ZIP codes per zone
At a glance
Largest cities in Connecticut
Connecticut extremes
From the 2023 zone data and NOAA 1991–2020 normals of the nearest station. One entry per town.
Mildest winters
highest zone
- Norwalk 068557b
- Old Greenwich 068707b
- Riverside 068787b
- Wethersfield 061297a
- New London 063207a
- East Lyme 063337a
Coldest winters
lowest zone
- Burlington 060136a
- Canaan 060186a
- Canton 060196a
- Canton Center 060206a
- Colebrook 060216a
- Collinsville 060226a
Longest growing season
median frost-free days
- Centerbrook 06409221 d
- Clinton 06413221 d
- Deep River 06417221 d
- Essex 06426221 d
- Ivoryton 06442221 d
- Old Saybrook 06475221 d
Shortest growing season
median frost-free days
Wettest
precipitation per year
- New Hartford 0605754.3 in
- Pine Meadow 0606154.3 in
- Torrington 0679054.3 in
- Avon 0600153.5 in
- Burlington 0601353.5 in
- Farmington 0603253.5 in
Snowiest
snowfall per year
- Canaan 0601875 in
- East Canaan 0602475 in
- Norfolk 0605875 in
- Winchester Center 0609475 in
- Goshen 0675675 in
- New Hartford 0605759 in
Hottest summers
days at 90 °F or more
- Bloomfield 0600220 d
- Windsor 0600620 d
- Broad Brook 0601620 d
- East Granby 0602620 d
- East Windsor Hill 0602820 d
- Granby 0603520 d
All places in Connecticut
Amston · Andover · Ansonia · Ashford · Avon
Ballouville · Baltic · Bantam · Barkhamsted · Beacon Falls · Berlin · Bethany · Bethel · Bethlehem · Bloomfield · Bolton · Botsford · Bozrah · Branford · Bridgeport · Bridgewater · Bristol · Broad Brook · Brookfield · Brooklyn · Burlington
Canaan · Canterbury · Canton · Canton Center · Centerbrook · Central Village · Chaplin · Cheshire · Chester · Clinton · Cobalt · Colchester · Colebrook · Collinsville · Columbia · Cornwall · Cornwall Bridge · Cos Cob · Coventry · Cromwell
Danbury · Danielson · Darien · Dayville · Deep River · Derby · Durham
East Berlin · East Canaan · East Glastonbury · East Granby · East Haddam · East Hampton · East Hartford · East Hartland · East Killingly · East Lyme · East Windsor · East Windsor Hill · East Woodstock · Eastford · Easton · Ellington · Enfield · Essex
Fabyan · Fairfield · Falls Village · Farmington
Gales Ferry · Gaylordsville · Georgetown · Gilman · Glastonbury · Goshen · Granby · Greens Farms · Greenwich · Grosvenor Dale · Groton · Guilford
Haddam · Hadlyme · Hamden · Hampton · Hanover · Hartford · Harwinton · Hawleyville · Hebron · Higganum
Lakeside · Lakeville · Lebanon · Ledyard · Litchfield
Madison · Manchester · Mansfield Center · Mansfield Depot · Marion · Marlborough · Mashantucket · Meriden · Middle Haddam · Middlebury · Middlefield · Middletown · Milford · Milldale · Monroe · Moodus · Moosup · Morris · Mystic
Naugatuck · New Britain · New Canaan · New Fairfield · New Hartford · New Haven · New London · New Milford · New Preston Marble Dale · Newington · Newtown · Niantic · Norfolk · North Branford · North Canton · North Franklin · North Granby · North Grosvenordale · North Haven · North Stonington · North Westchester · North Windham · Northfield · Northford · Norwalk · Norwich
Oakdale · Oakville · Old Greenwich · Old Lyme · Old Mystic · Old Saybrook · Oneco · Orange · Oxford
Pawcatuck · Pequabuck · Pine Meadow · Plainfield · Plainville · Plantsville · Plymouth · Pomfret Center · Poquonock · Portland · Preston · Prospect · Putnam
Redding · Redding Center · Redding Ridge · Ridgefield · Riverside · Riverton · Rockfall · Rocky Hill · Rogers · Roxbury
Salem · Salisbury · Sandy Hook · Scotland · Seymour · Sharon · Shelton · Sherman · Simsbury · Somers · Somersville · South Britain · South Glastonbury · South Kent · South Lyme · South Willington · South Windham · South Windsor · South Woodstock · Southbury · Southington · Southport · Stafford · Stafford Springs · Staffordville · Stamford · Sterling · Stevenson · Stonington · Storrs Mansfield · Stratford · Suffield
Taconic · Taftville · Tariffville · Terryville · Thomaston · Thompson · Tolland · Torrington · Trumbull
Vernon Rockville · Versailles · Voluntown
Wallingford · Washington · Washington Depot · Waterbury · Waterford · Watertown · Wauregan · Weatogue · West Cornwall · West Granby · West Hartford · West Hartland · West Haven · West Mystic · West Simsbury · West Suffield · Westbrook · Weston · Westport · Wethersfield · Willimantic · Willington · Wilton · Winchester Center · Windham · Windsor · Windsor Locks · Winsted · Wolcott · Woodbury · Woodstock · Woodstock Valley
Questions
What planting zones are in Connecticut?
Connecticut spans USDA hardiness zones 6a to 7b on the 2023 map. The most common zone is 6b (252 of 418 ZIP codes).
When is the last frost in Connecticut?
Across Connecticut, the median last spring frost ranges from about Apr 5 to May 11 depending on location; the typical ZIP code sees it around Apr 18. Look up your ZIP code for a local date.