Hardiness zone

This shows the temperatures of the hardiness zones

A hardiness zone is an area where some plants can grow. The zones are categories based on the average coldest temperature in a given year. Plants in that category or one with a lower number can grown in that area.

Hardiness Zone Media

Temperature scale used to define USDA hardiness zones. These are annual extreme minima (an area is assigned to a zone by taking the lowest temperature recorded there in a given year). As shown, the USDA uses a GIS dataset averaged over 1976 to 2005 for its United States maps.
A very useful map for determining world hardiness zones.
2023 update of the USDA Plant Hardiness Zone Map
Britain and Ireland's hardiness zones, USDA scale, 2006
A garden in Simrishamn, southern Sweden.
Central Europe hardiness zones.

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