Britannica Sources used in this answer

Which climates are home to most Ericaceae species?

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Cluster of blooming pink azaleas, Rhododendron roseum, with green leaves and dark foliage in the background. — Ericales Flowering rhododendron.

Species in the Ericaceae family are widely distributed across the globe, occurring primarily in the following climates:

Tropical montane
Mediterranean
Temperate to arctic

While these plants are found in a variety of environments—including subarctic regions and along mountain chains through the tropics—they generally favor temperate climates and acidic habitats.12