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Maine Planting Zones

Maine covers USDA hardiness zones 3b to 7a on the 2023 map. The most common zone is 5a (32% of ZIP codes), where the coldest winter night averages -20 to -15 °F. Portland is zone 6a, Augusta is zone 5b and Auburn is zone 5b.

Zones in Maine

Share of the state’s ZIP codes in each zone.

3b <1% -35 to -30 °F
4a 5% -30 to -25 °F
4b 6% -25 to -20 °F
5a 32% -20 to -15 °F
5b 31% -15 to -10 °F
6a 23% -10 to -5 °F
6b 2% -5 to 0 °F
7a <1% 0 to 5 °F

Major cities

Portland 6a
Augusta 5b
Auburn 5b
Freeport 6a
Lewiston 5b
Bangor 5a
Biddeford 5b
Castine 5b
New Portland 4b–5a
Orono 5a
Scarborough 6a
South Portland 6a

Every city and town in Maine

Abbot 04406 5a
Acton 04001 5b
Addison 04606 6a
Albion 04910 5a
Alfred 04002 5b
Alna 04535 5b
Andover 04216 4b
Anson 04911 5a
Ashland 04732 4a
Athens 04912 5a
Auburn 04210+ 5b
Augusta 04330+ 5b
Aurora 04408 5a
Bailey Island 04003 6a
Baileyville 04694 5b
Bangor 04401+ 5a
Bar Harbor 04609 6a
Bar Mills 04004 5b
Bass Harbor 04653 6a
Bath 04530 6a
Beals 04611 6a
Belfast 04915 5b
Belgrade 04917 5b
Belgrade Lakes 04918 5a
Benedicta 04733 5a
Bernard 04612 6a
Berwick 03901 6a
Bethel 04217 5a
Biddeford 04005+ 5b
Bingham 04920 5a
Birch Harbor 04613 6a
Blaine 04734 4a
Blue Hill 04614 5b
Boothbay 04537 6a
Boothbay Harbor 04538 6a
Bowdoin 04287 5b
Bowdoinham 04008 5b
Bradford 04410 5a
Bradley 04411 5a
Bremen 04551 6a
Brewer 04412 5a
Bridgewater 04735 4b
Bridgton 04009 5a
Bristol 04539 6a
Brooklin 04616 6a
Brooks 04921 5a
Brooksville 04617 5b
Brookton 04413 5a
Brownfield 04010 5a
Brownville 04414 5a
Brownville Junction 04415 5a
Brunswick 04011 5b
Bryant Pond 04219 5a
Buckfield 04220 5b
Bucksport 04416 5a
Burlington 04417 5a
Burnham 04922 5a
Buxton 04093 5b
Calais 04619 5b
Cambridge 04923 5a
Camden 04843 5b
Canaan 04924 5a
Canton 04221 5a
Cape Elizabeth 04107 6a
Cape Neddick 03902 6a
Cape Porpoise 04014 6a
Caratunk 04925 5a
Caribou 04736 4a
Carmel 04419 5a
Casco 04015 5b
Castine 04420+ 5b
Center Lovell 04016 5a
Chamberlain 04541 6a
Charleston 04422 5a
Chebeague Island 04017 6a
Cherryfield 04622 5b
China Village 04926 5b
Clayton Lake 04737 3b
Cliff Island 04019 6a
Clinton 04927 5a
Columbia Falls 04623 5b
Corea 04624 6a
Corinna 04928 4b
Corinth 04427 5a
Cornish 04020 5a
Cranberry Isles 04625 6b
Crouseville 04738 4a
Cumberland Center 04021 5b
Cumberland Foreside 04110 6a
Cushing 04563 6a
Cutler 04626 6a
Damariscotta 04543 6a
Danforth 04424 4b
Danville 04223 5b
Deer Isle 04627 6a
Denmark 04022 5a
Dennysville 04628 5b
Detroit 04929 5a
Dexter 04930 5a
Dixfield 04224 5a
Dixmont 04932 5a
Dover Foxcroft 04426 5a
Dresden 04342 5b
Dryden 04225 4b
Durham 04222 5b
Eagle Lake 04739 4a
East Andover 04226 5a
East Baldwin 04024 5a
East Blue Hill 04629 5b
East Boothbay 04544 6a
East Dixfield 04227 5a
East Livermore 04228 5b
East Machias 04630 5b
East Millinocket 04430 5a
East Newport 04933 5a
East Orland 04431 5b
East Parsonsfield 04028 5a
East Poland 04230 5b
East Vassalboro 04935 5b
East Waterboro 04030 5b
East Wilton 04234 5a
East Winthrop 04343 5b
Easton 04740 4a
Eastport 04631 6a
Eddington 04428 5a
Edgecomb 04556 5b
Eliot 03903 6a
Ellsworth 04605 5b
Etna 04434 5a
Eustis 04936 4b
Exeter 04435 5a
Fairfield 04937 5a
Falmouth 04105 6a
Farmingdale 04344 5b
Farmington 04938 5a
Farmington Falls 04940 5a
Fort Fairfield 04742 4a
Fort Kent 04743 4b
Fort Kent Mills 04744 4a
Frankfort 04438 5a
Franklin 04634 5b
Freedom 04941 5a
Freeport 04032+ 6a
Frenchboro 04635 6b
Frenchville 04745 4b
Friendship 04547 6a
Fryeburg 04037 5a
Gardiner 04345 5b
Garland 04939 5a
Georgetown 04548 6a
Gorham 04038 5b
Gouldsboro 04607 6a
Grand Isle 04746 4a
Grand Lake Stream 04637 5b
Gray 04039 5b
Greenbush 04418 5a
Greene 04236 5b
Greenville 04441 4a
Greenville Junction 04442 4b
Greenwood 04255 5a
Guilford 04443 5a
Hallowell 04347 5b
Hampden 04444 5a
Hancock 04640 5b
Hanover 04237 5a
Harborside 04642 6a
Harmony 04942 5a
Harpswell 04079 6a
Harrington 04643 6a
Harrison 04040 5a
Hartland 04943 5a
Hebron 04238 5b
Hinckley 04944 5a
Hiram 04041 5a
Holden 04429 5a
Hollis Center 04042 5b
Hope 04847 5b
Houlton 04730 4b
Howland 04448 5a
Hudson 04449 5a
Hulls Cove 04644 6a
Island Falls 04747 4b
Isle Au Haut 04645 6b
Islesboro 04848 6a
Islesford 04646 6b
Jackman 04945 4b
Jay 04239 5a
Jefferson 04348 5b
Jonesboro 04648 5b
Jonesport 04649 6a
Kenduskeag 04450 5a
Kennebunk 04043 5b
Kennebunkport 04046 6a
Kents Hill 04349 5b
Kingfield 04947 5a
Kingman 04451 5a
Kittery 03904 6a
Kittery Point 03905 6b
Lagrange 04453 5a
Lambert Lake 04454 5a
Lebanon 04027 5b
Lee 04455 5a
Leeds 04263 5b
Levant 04456 5a
Lewiston 04240+ 5b
Liberty 04949 5b
Limerick 04048 5a
Limestone 04750 4a
Limington 04049 5a
Lincoln 04457 5a
Lincolnville 04849 5b
Lincolnville Center 04850 5b
Lisbon 04250 5b
Lisbon Falls 04252 5b
Litchfield 04350 5b
Little Deer Isle 04650 6a
Livermore 04253 5b
Livermore Falls 04254 5b
Long Island 04050 6a
Lovell 04051 5a
Lubec 04652 6a
Machias 04654 5b
Machiasport 04655 6a
Madawaska 04756 4b
Madison 04950 5a
Manchester 04351 5b
Mapleton 04757 4a
Mars Hill 04758 4a
Matinicus 04851 7a
Mattawamkeag 04459 5a
Mechanic Falls 04256 5b
Meddybemps 04657 5b
Medway 04460 5a
Mexico 04257 5a
Milbridge 04658 6a
Milford 04461 5a
Millinocket 04462 5a
Milo 04463 5a
Minot 04258 5b
Monhegan 04852 6b
Monmouth 04259 5b
Monroe 04951 5a
Monson 04464 5a
Monticello 04760 4a
Moody 04054 6a
Morrill 04952 5b
Mount Desert 04660 6a
Mount Vernon 04352 5b
Naples 04055 5a
New Gloucester 04260 5b
New Harbor 04554 6a
New Limerick 04761 4b
New Portland 04954+ 4b–5a
New Sharon 04955 5a
New Sweden 04762 4a
New Vineyard 04956 5a
Newcastle 04553 5b
Newfield 04056 5b
Newport 04953 4b
Newry 04261 5a
Nobleboro 04555 5b
Norridgewock 04957 5a
North Anson 04958 5a
North Berwick 03906 5b
North Bridgton 04057 5a
North Haven 04853 6a
North Jay 04262 5a
North Monmouth 04265 5b
North Turner 04266 5b
North Vassalboro 04962 5b
North Waterboro 04061 5a
North Waterford 04267 5a
North Yarmouth 04097 6a
Northeast Harbor 04662 6a
Norway 04268 5a
Oakfield 04763 4b
Oakland 04963 5a
Ocean Park 04063 6a
Ogunquit 03907 6a
Old Orchard Beach 04064 6a
Old Town 04468 5a
Oquossoc 04964 4b
Orient 04471 4b
Orland 04472 5b
Orono 04469+ 5a
Orrington 04474 5a
Orrs Island 04066 6a
Owls Head 04854 6a
Oxbow 04764 4b
Oxford 04270 5b
Palermo 04354 5b
Palmyra 04965 5a
Parsonsfield 04047 5b
Passadumkeag 04475 5a
Patten 04765 4b
Peaks Island 04108 6a
Pemaquid 04558 6a
Pembroke 04666 5b
Penobscot 04476 5b
Perham 04766 4a
Perry 04667 6a
Peru 04290 5a
Phillips 04966 4b
Phippsburg 04562 6a
Pittsfield 04967 5a
Plymouth 04969 5a
Poland 04274 5b
Port Clyde 04855 6b
Portage 04768 4a
Porter 04068 5a
Portland 04101+ 6a
Pownal 04069 5b
Presque Isle 04769 4a
Princeton 04668 5b
Prospect Harbor 04669 6a
Randolph 04346 5b
Rangeley 04970 4b
Raymond 04071 5b
Readfield 04355 5b
Richmond 04357 5b
Robbinston 04671 5b
Rockland 04841 6a
Rockport 04856 6a
Rockwood 04478 4b
Round Pond 04564 6a
Roxbury 04275 5a
Rumford 04276 5a
Sabattus 04280 5b
Saco 04072 5b
Saint Agatha 04772 4a
Saint Albans 04971 5a
Saint David 04773 4b
Saint Francis 04774 4b
Salsbury Cove 04672 6a
Sandy Point 04972 5b
Sanford 04073 5b
Sangerville 04479 5a
Sargentville 04673 6a
Scarborough 04070+ 6a
Seal Cove 04674 6a
Seal Harbor 04675 6a
Searsmont 04973 5b
Searsport 04974 5b
Sebago 04029 5a
Sebasco Estates 04565 6a
Sebec 04481 5a
Sedgwick 04676 5b
Shapleigh 04076 5b
Shawmut 04975 5b
Sheridan 04775 4a
Sherman 04776 5a
Shirley Mills 04485 5a
Sinclair 04779 4a
Skowhegan 04976 5a
Smithfield 04978 5a
Smyrna Mills 04780 4b
Solon 04979 5a
Sorrento 04677 6a
South Berwick 03908 6a
South Bristol 04568 6a
South Casco 04077 5b
South China 04358 5b
South Freeport 04078 6a
South Gardiner 04359 5b
South Paris 04281 5b
South Portland 04106+ 6a
South Thomaston 04858 6a
South Windham 04082 5b
Southport 04576 6a
Southwest Harbor 04679 6a
Springfield 04487 5a
Springvale 04083 5b
Spruce Head 04859 6a
Squirrel Island 04570 6a
Stacyville 04777 5a
Standish 04084 5b
Steep Falls 04085 5a
Stetson 04488 5a
Steuben 04680 6a
Stillwater 04489 5a
Stockholm 04783 4a
Stockton Springs 04981 5b
Stoneham 04231 5a
Stonington 04681 6a
Stratton 04982 4b
Strong 04983 5a
Sullivan 04664 5b
Sumner 04292 5a
Sunset 04683 6a
Surry 04684 5b
Swans Island 04685 6b
Temple 04984 5a
Tenants Harbor 04860 6b
Thomaston 04861 6a
Thorndike 04986 5a
Topsfield 04490 5a
Topsham 04086 5b
Trevett 04571 6a
Troy 04987 5a
Turner 04282 5b
Union 04862 5b
Unity 04988 5a
Van Buren 04785 4a
Vanceboro 04491 5a
Vassalboro 04989 5b
Vienna 04360 5a
Vinalhaven 04863 6b
Waite 04492 5a
Waldoboro 04572 6a
Wallagrass 04781 4a
Walpole 04573 6a
Warren 04864 5b
Washburn 04786 4a
Washington 04574 5b
Waterboro 04087 5b
Waterford 04088 5a
Waterville 04901+ 5b
Wayne 04284 5b
Weld 04285 5a
Wells 04090 6a
Wesley 04686 5b
West Baldwin 04091 5a
West Bethel 04286 5a
West Boothbay Harbor 04575 6a
West Enfield 04493 5a
West Farmington 04992 5a
West Forks 04985 4b
West Kennebunk 04094 5b
West Minot 04288 5b
West Newfield 04095 5b
West Paris 04289 5a
West Poland 04291 5b
West Rockport 04865 5b
Westbrook 04092+ 5b
Westfield 04787 4a
Whitefield 04353 5b
Whiting 04691 5b
Wilton 04294 5a
Windham 04062 5b
Windsor 04363 5b
Winn 04495 5a
Winter Harbor 04693 6a
Winterport 04496 5a
Winthrop 04364 5b
Wiscasset 04578 5b
Woolwich 04579 5b
Wytopitlock 04497 4b
Yarmouth 04096 6a
York 03909 6a
York Beach 03910 6a
York Harbor 03911 6a

Other states

Alabama Alaska Arizona Arkansas California Colorado Connecticut Delaware District of Columbia Florida Georgia Hawaii Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana 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 Maine?

Maine spans zones 3b–7a. Zone 5a is the most common, covering 32% of the state's ZIP codes. Enter your ZIP code above for your exact zone.

What planting zone is Portland, ME?

Portland is in USDA zone 6a. Its average coldest winter night is -10 to -5 °F.

What planting zone is Augusta, ME?

Augusta is in USDA zone 5b. Its average coldest winter night is -15 to -10 °F.

What planting zone is Auburn, ME?

Auburn is in USDA zone 5b. Its average coldest winter night is -15 to -10 °F.

What is the coldest zone in Maine?

The coldest part of Maine is zone 3b, with winter lows of -35 to -30 °F. The warmest is zone 7a, at 0 to 5 °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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