RHS & USDA Hardiness Zones

Reference this list of Royal Horticultural Society (RHS) and United States Department of Agriculture (USDA) Hardiness Zones when deciding what to plant in your local climate.

 

RHS Rating USDA Zone Temperature Hardiness
H1a 13 > 59°F (15°C) Tropical
H1b 12 50 – 59°F (10 – 15°C) Subtropical
H1c 11 41 – 50°F (5 – 10°C) Warm temperate
H2 10 34 – 41°F (1 – 5°C) Tender cool
H3 9 23 – 24°F (-5 – 1°C) Half-hardy
H4 8 & 9 14 – 23°F (-10 – -5°C) Hardy Average winter
H5 7 & 8 5 – 14°F (-15 – -10°C) Hardy Cold winter
H6 6 & 7 -4 – 5°F (-20 – -15°C) Hardy Very cold winter

Browse all of our currently available plants and seeds, organised by the USDA Hardiness Zones they will grow in:

USDA Zone 1 | USDA Zone 2 | USDA Zone 3 | USDA Zone 4 | USDA Zone 5 | USDA Zone 6 | USDA Zone 7 | USDA Zone 8 | USDA Zone 9 | USDA Zone 10 | USDA Zone 11 | USDA Zone 12 | USDA Zone 13

 

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