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Hardiness zones were initially created by the United States Department of Agriculture (USDA).

These zones were established after calculating the average minimum temperatures retained during the last 30 years.

Québec

Hardiness zone in Quebec

USDA

Area 0a/0b
Area 1a
Area 1b
Area 2a
Area 2b
Area 3a
Area 3b
Area 4a
Area 4b
Area 5a

Area 5b

Temperature

-56.7 to -51.1°C
-51.1 -48.3°C
-48.3 to -45.6°C
-45.6 to -42.8°C
-42.8 to -40.0°C
-40.0 to -37.2°C
-37.2 to -34.4°C
-34.4 to -31.7°C
-31.7 to -28.9°C
-28.9 to -26.1°C

-26.1 to -23.3°C

Some reference cities

Fermont, Inukjuak, Kuujjuaq

Labrador, Wemindji, Hopedale

Amos, Palmarolle, Normal

Dolbeau-Mistassini, Val-d'Or

Mingan, Winneway

Chicoutimi, Maniwaki

Baie-Comeau, Lac-Megantic

Gaspe, Otter Lake, Sherbrooke

Dunham, Gatineau, Quebec

Blainville, Frelighsburg, Hudson

Montreal, Saint-Chrysostome

Hardiness-zone-map-quebec-paysages-7-greenscreen.jpg
France

Hardiness zone in France

USDA

Area 6a

Area 6b

Area 7a

Area 7b

Area 8a

Area 8b

Area 9a/9b

Area 10a/10b

Temperature

-23.3 to -20.6°C

-20.6 to -17.8°C

-17.8 to -15°C

-15 to -12.2°C

-12.2 to -9.4°C

-9.4 to -6.7°C

-6.7 to -1.1°C

-1.1 at  4.4°C

Some reference cities

Annecy, Belfort, Metz

Lourdes, Strasbourg, Yssingeaux

Dijon, Nancy, Orleans

Angers, Caen, Lyons

Bordeaux, Brest, Calais

Courmes, Gap, Nantes

Agen, Toulouse, Valencia

Avignon, Nice, Perpignan

Hardiness-zone-map-france-paysages-7-greenscreen.jpg
Australie

Hardiness zone in Australia

USDA

Area 9a

Area 9b

Area 10a

Area 11a

Area 12a

Temperature

-6.7 to -3.9°C

-3.9 to -1.1°C

-1.1 to 4.4°C

4.4 at 10°C

10 to 15.6°C

Some reference cities

Armidale, Canberra

Alice Springs, Bendigo, Moree

Albany, Brisbane, Melbourne

Broome, Cairns, Mount Isa

Darwin

Hardiness-zone-map-australia-paysages-7-greenscreen.jpg
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