NRCan Zone 1

Average annual extreme minimum temperature: -45.6 to -40.0°C (-50 to -40°F).

USDA, RHS, EGHZ & NRCan cross-reference

See how this rating compares across global hardiness systems. Matching USDA zones are highlighted.

USDA	Min. temp. (°C)	Min. temp. (°F)	RHS	EGHZ	NRCan	Climate class
USDA Zone 1	< -45.6	< -50	—	0	0	Arctic Alpine
USDA Zone 2	-45.6 to -40.0	-50 to -40	H7	2	1	Subarctic
USDA Zone 3	-40.0 to -34.4	-40 to -30	H7	3	2	Northern Taiga
USDA Zone 4	-34.4 to -28.9	-30 to -20	H7	4	3	Middle Taiga
USDA Zone 5	-28.9 to -23.3	-20 to -10	H6	5	4	Southern Taiga
USDA Zone 6	-23.3 to -17.8	-10 to 0	H5/H6	6	5	Mixed Forest
USDA Zone 7	-17.8 to -12.2	0 to 10	H4/H5	7	6	Forest-Steppe
USDA Zone 8	-12.2 to -6.7	10 to 20	H4	8	7	Steppe
USDA Zone 9	-6.7 to -1.1	20 to 30	H3	9	8	Semiarid
USDA Zone 10	-1.1 to +4.4	30 to 40	H2	10	9	Subtropical
USDA Zone 11	+4.4 to +10.0	40 to 50	H1c	11	—	Moist Tropical
USDA Zone 12	+10.0 to +15.6	50 to 60	H1b	—	—	Humid Equatorial
USDA Zone 13	> +15.6	> 60	H1a	—	—	Hyper-Humid Equatorial