Ontario Plant Hardiness Zones

Hardiness Zones, also referred to as Growing Zones or Planting zones are defined by the U.S. Department of Agriculture (USDA) Agricultural Research Service (ARS). The zones in this map were created in 2010 using mean extreme climate data covering the period of 1981 to 2010.

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Ontario Hardiness Zones Map

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List of Hardiness Zones for Locations in Ontario

LocationHardiness Zone
Acton5b - -26.1°C to -23.3°C
Ajax6b - -20.6°C to -17.8°C
Alexandria5a - -28.9°C to -26.1°C
Alliston5b - -26.1°C to -23.3°C
Almonte5a - -28.9°C to -26.1°C
Amherstburg7a - -17.8°C to -15°C
Angus5b - -26.1°C to -23.3°C
Armstrong2a - -45.6°C to -42.8°C
Arnprior5a - -28.9°C to -26.1°C
Atherley5b - -26.1°C to -23.3°C
Atikokan3b - -37.2°C to -34.4°C
Attawapiskat1b - -45.6°C to -42.8°C
Aylmer6b - -20.6°C to -17.8°C
Azilda4b - -31.7°C to -28.9°C
Bancroft4a - -34.4°C to -31.7°C
Barrie5b - -26.1°C to -23.3°C
Barry's Bay4a - -34.4°C to -31.7°C
Beamsville6b - -20.6°C to -17.8°C
Beeton5b - -26.1°C to -23.3°C
Belle River7a - -17.8°C to -15°C
Belleville6a - -23.3°C to -20.6°C
Big Trout Lake1b - -45.6°C to -42.8°C
Bigaanjigamiing / Pikangikum2b - -42.8°C to -40°C
Blenheim6b - -20.6°C to -17.8°C
Blind River5a - -28.9°C to -26.1°C
Bolton5b - -26.1°C to -23.3°C
Bowmanville6a - -23.3°C to -20.6°C
Bracebridge4b - -31.7°C to -28.9°C
Bradford5b - -26.1°C to -23.3°C
Brampton6a - -23.3°C to -20.6°C
Brantford6a - -23.3°C to -20.6°C
Brighton6a - -23.3°C to -20.6°C
Brockville6a - -23.3°C to -20.6°C
Bruce Mines5a - -28.9°C to -26.1°C
Caledonia6b - -20.6°C to -17.8°C
Cambridge6a - -23.3°C to -20.6°C
Campbellford5b - -26.1°C to -23.3°C
Capreol4a - -34.4°C to -31.7°C
Carleton Place5a - -28.9°C to -26.1°C
Cartier4a - -34.4°C to -31.7°C
Casselman5a - -28.9°C to -26.1°C
Cayuga6b - -20.6°C to -17.8°C
Chapleau3a - -40°C to -37.2°C
Chatham6b - -20.6°C to -17.8°C
Chelmsford4b - -31.7°C to -28.9°C
Chesley5b - -26.1°C to -23.3°C
Clarence-Rockland5a - -28.9°C to -26.1°C
Clinton6a - -23.3°C to -20.6°C
Cobalt3b - -37.2°C to -34.4°C
Cobourg6a - -23.3°C to -20.6°C
Cochrane2b - -42.8°C to -40°C
Collingwood6a - -23.3°C to -20.6°C
Coniston4b - -31.7°C to -28.9°C
Copper Cliff4b - -31.7°C to -28.9°C
Cornwall5b - -26.1°C to -23.3°C
Corunna7a - -17.8°C to -15°C
Courtice6a - -23.3°C to -20.6°C
Deep River4b - -31.7°C to -28.9°C
Delhi6a - -23.3°C to -20.6°C
Deseronto6a - -23.3°C to -20.6°C
Dresden6b - -20.6°C to -17.8°C
Dryden3b - -37.2°C to -34.4°C
Dubreuilville3a - -40°C to -37.2°C
Dunnville6b - -20.6°C to -17.8°C
Durham5b - -26.1°C to -23.3°C
Ear Falls3b - -37.2°C to -34.4°C
Elliot Lake4b - -31.7°C to -28.9°C
Elmira5b - -26.1°C to -23.3°C
Elmvale5b - -26.1°C to -23.3°C
Embrun5b - -26.1°C to -23.3°C
Emo4a - -34.4°C to -31.7°C
Englehart3a - -40°C to -37.2°C
Erin5b - -26.1°C to -23.3°C
Espanola4b - -31.7°C to -28.9°C
Essex7a - -17.8°C to -15°C
Exeter6a - -23.3°C to -20.6°C
Falconbridge4b - -31.7°C to -28.9°C
Fenelon Falls5a - -28.9°C to -26.1°C
Fergus5b - -26.1°C to -23.3°C
Field4a - -34.4°C to -31.7°C
Foleyet3a - -40°C to -37.2°C
Fonthill6b - -20.6°C to -17.8°C
Fort Erie6b - -20.6°C to -17.8°C
Fort Hope2a - -45.6°C to -42.8°C
Fort Severn1a - -45.6°C to -42.8°C
Gananoque6a - -23.3°C to -20.6°C
Garson4b - -31.7°C to -28.9°C
Georgetown5b - -26.1°C to -23.3°C
Geraldton2b - -42.8°C to -40°C
Glencoe6b - -20.6°C to -17.8°C
Goderich6a - -23.3°C to -20.6°C
Gore Bay5a - -28.9°C to -26.1°C
Gravenhurst5a - -28.9°C to -26.1°C
Grimsby7a - -17.8°C to -15°C
Guelph5b - -26.1°C to -23.3°C
Hagersville6b - -20.6°C to -17.8°C
Haileybury3b - -37.2°C to -34.4°C
Haliburton4b - -31.7°C to -28.9°C
Hamilton6b - -20.6°C to -17.8°C
Hanmer4b - -31.7°C to -28.9°C
Hanover5b - -26.1°C to -23.3°C
Harrow7a - -17.8°C to -15°C
Hawkesbury5a - -28.9°C to -26.1°C
Hearst2a - -45.6°C to -42.8°C
Huntsville4b - -31.7°C to -28.9°C
Huron Shores4b - -31.7°C to -28.9°C
Ignace3b - -37.2°C to -34.4°C
Ingersoll6a - -23.3°C to -20.6°C
Ingleside5b - -26.1°C to -23.3°C
Innisfil5b - -26.1°C to -23.3°C
Iron Bridge5a - -28.9°C to -26.1°C
Iroquois Falls2b - -42.8°C to -40°C
Kapuskasing2b - -42.8°C to -40°C
Kasabonika Lake1b - -45.6°C to -42.8°C
Kawartha Lakes5b - -26.1°C to -23.3°C
Keewatin4a - -34.4°C to -31.7°C
Keewaywin2a - -45.6°C to -42.8°C
Kemptville5b - -26.1°C to -23.3°C
Kenora4a - -34.4°C to -31.7°C
Keswick5b - -26.1°C to -23.3°C
Kincardine6a - -23.3°C to -20.6°C
King City5b - -26.1°C to -23.3°C
Kingston6a - -23.3°C to -20.6°C
Kingsville7a - -17.8°C to -15°C
Kirkland Lake3a - -40°C to -37.2°C
Kitchener5b - -26.1°C to -23.3°C
Lakefield5b - -26.1°C to -23.3°C
Lakeshore7a - -17.8°C to -15°C
Lavigne4b - -31.7°C to -28.9°C
Leamington7a - -17.8°C to -15°C
Lindsay5b - -26.1°C to -23.3°C
Listowel5b - -26.1°C to -23.3°C
Little Current5a - -28.9°C to -26.1°C
Lively4b - -31.7°C to -28.9°C
London6b - -20.6°C to -17.8°C
Longlac2b - -42.8°C to -40°C
Manitouwadge3a - -40°C to -37.2°C
Marathon3b - -37.2°C to -34.4°C
Markham6a - -23.3°C to -20.6°C
Massey4b - -31.7°C to -28.9°C
Matachewan3a - -40°C to -37.2°C
Meaford6a - -23.3°C to -20.6°C
Merrickville5b - -26.1°C to -23.3°C
Metcalfe5b - -26.1°C to -23.3°C
Milton6a - -23.3°C to -20.6°C
Minden4b - -31.7°C to -28.9°C
Mishibikwadinaang/ Michipicoten3b - -37.2°C to -34.4°C
Mississauga6a - -23.3°C to -20.6°C
Mitchell6a - -23.3°C to -20.6°C
Montrock2b - -42.8°C to -40°C
Moose Factory1b - -45.6°C to -42.8°C
Moosonee1b - -45.6°C to -42.8°C
Morrisburg5a - -28.9°C to -26.1°C
Mount Forest5b - -26.1°C to -23.3°C
Napanee6a - -23.3°C to -20.6°C
Neskantaga2a - -45.6°C to -42.8°C
New Liskeard3b - -37.2°C to -34.4°C
Newmarket5b - -26.1°C to -23.3°C
Niagara Falls6b - -20.6°C to -17.8°C
Niagara-on-the-Lake7a - -17.8°C to -15°C
Nibinamik2a - -45.6°C to -42.8°C
Nipigon3a - -40°C to -37.2°C
North Bay4b - -31.7°C to -28.9°C
North Cobalt3b - -37.2°C to -34.4°C
Norwich6a - -23.3°C to -20.6°C
Oakville6b - -20.6°C to -17.8°C
Ogoki2a - -45.6°C to -42.8°C
Onaping4a - -34.4°C to -31.7°C
Orangeville5a - -28.9°C to -26.1°C
Orillia5b - -26.1°C to -23.3°C
Oshawa6a - -23.3°C to -20.6°C
Oshki-Mishkeegogamang / New Osnaburgh2b - -42.8°C to -40°C
Ottawa5b - -26.1°C to -23.3°C
Owen Sound6a - -23.3°C to -20.6°C
Paisley5b - -26.1°C to -23.3°C
Palmerston5b - -26.1°C to -23.3°C
Parry Sound5b - -26.1°C to -23.3°C
Peawanuck0b - -53.8°C to -51.1°C
Pelham6b - -20.6°C to -17.8°C
Pembroke4b - -31.7°C to -28.9°C
Penetanguishene5b - -26.1°C to -23.3°C
Perth5b - -26.1°C to -23.3°C
Petawawa4b - -31.7°C to -28.9°C
Peterborough5b - -26.1°C to -23.3°C
Petrolia6b - -20.6°C to -17.8°C
Pickering6b - -20.6°C to -17.8°C
Pickle Lake2b - -42.8°C to -40°C
Picton6a - -23.3°C to -20.6°C
Porcupine3a - -40°C to -37.2°C
Port Dover6b - -20.6°C to -17.8°C
Port Elgin6a - -23.3°C to -20.6°C
Port Hope6a - -23.3°C to -20.6°C
Port Perry5b - -26.1°C to -23.3°C
Port Stanley6b - -20.6°C to -17.8°C
Prescott5b - -26.1°C to -23.3°C
Quinte West6a - -23.3°C to -20.6°C
Red Lake3a - -40°C to -37.2°C
Red Rock3a - -40°C to -37.2°C
Renfrew5a - -28.9°C to -26.1°C
Richmond Hill6a - -23.3°C to -20.6°C
Ridgetown6b - -20.6°C to -17.8°C
Rockland5a - -28.9°C to -26.1°C
Rockwood5b - -26.1°C to -23.3°C
Russell5b - -26.1°C to -23.3°C
Sandy Lake2b - -42.8°C to -40°C
Sauble Beach6a - -23.3°C to -20.6°C
Sault Ste. Marie5a - -28.9°C to -26.1°C
Schreiber3a - -40°C to -37.2°C
Seaforth6a - -23.3°C to -20.6°C
Shelburne5a - -28.9°C to -26.1°C
Simcoe6b - -20.6°C to -17.8°C
Sioux Lookout3b - -37.2°C to -34.4°C
Sioux Narrows4a - -34.4°C to -31.7°C
Skead4b - -31.7°C to -28.9°C
Smiths Falls5b - -26.1°C to -23.3°C
Smithville6b - -20.6°C to -17.8°C
Smooth Rock Falls2b - -42.8°C to -40°C
South Porcupine3a - -40°C to -37.2°C
Southampton6a - -23.3°C to -20.6°C
Spanish5a - -28.9°C to -26.1°C
St. Catharines7a - -17.8°C to -15°C
St. Marys6a - -23.3°C to -20.6°C
St. Thomas6b - -20.6°C to -17.8°C
Stayner5b - -26.1°C to -23.3°C
Stouffville6a - -23.3°C to -20.6°C
Stratford6a - -23.3°C to -20.6°C
Strathroy6b - -20.6°C to -17.8°C
Sturgeon Falls4b - -31.7°C to -28.9°C
Sudbury4b - -31.7°C to -28.9°C
Sunshine3a - -40°C to -37.2°C
Sutton5b - -26.1°C to -23.3°C
Tavistock6a - -23.3°C to -20.6°C
Tecumseh7a - -17.8°C to -15°C
Temagami3b - -37.2°C to -34.4°C
Temiskaming Shores3b - -37.2°C to -34.4°C
Terrace Bay3b - -37.2°C to -34.4°C
Thessalon5a - -28.9°C to -26.1°C
Thornbury6a - -23.3°C to -20.6°C
Thorold6b - -20.6°C to -17.8°C
Thunder Bay3b - -37.2°C to -34.4°C
Tilbury7a - -17.8°C to -15°C
Tillsonburg6b - -20.6°C to -17.8°C
Toronto7a - -17.8°C to -15°C
Trenton6a - -23.3°C to -20.6°C
Tweed5b - -26.1°C to -23.3°C
Val Thérèse4b - -31.7°C to -28.9°C
Vaughan6a - -23.3°C to -20.6°C
Verner4b - -31.7°C to -28.9°C
Walkerton5b - -26.1°C to -23.3°C
Wallaceburg6b - -20.6°C to -17.8°C
Warren4a - -34.4°C to -31.7°C
Wasaga Beach6a - -23.3°C to -20.6°C
Waterford6a - -23.3°C to -20.6°C
Waterloo5b - -26.1°C to -23.3°C
Wawa3b - -37.2°C to -34.4°C
Weagamow Lake2a - -45.6°C to -42.8°C
Welland6b - -20.6°C to -17.8°C
Whitby6a - -23.3°C to -20.6°C
White River3a - -40°C to -37.2°C
Whitefish Falls5a - -28.9°C to -26.1°C
Wiarton6a - -23.3°C to -20.6°C
Winchester5a - -28.9°C to -26.1°C
Windsor7a - -17.8°C to -15°C

Hardiness Zone Maps for Neighboring States

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