Plant hardiness zones Archives - Local Gardener

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Asked: April 19, 2024

What uk counties are in what usda zones?

What uk counties are in what usda zones?

Mapping what uk counties are in what usda zones is challenging due to the differing climate patterns and microclimates within each county. However, we can make some general observations based on the climate characteristics of different regions in the UK. Read more

RHS Hardiness Ratings	USDA Plant Hardiness Zones	Approximate Temperature Range (°C)
H1a H1b H1c	13 12 11	>15°C 10 to 15°C 5 to 10°C
H2	10b	1 to 5°C
H3	9b to 10a	-5 to 1°C
H4	8b to 9a	-10 to -5°C
H5	7b to 8a	-15 to -10°C
H6	6b and 7a	-20 to -15°C
H7	6a	Below -20°C