Most monarch butterflies of the eastern North American population spend the winter clustered on oyamel fir trees in mountainous areas.
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Most monarch butterflies of the eastern North American population spend the winter clustered on oyamel fir trees in mountainous areas.
Sources
The eastern population of the monarch butterfly overwinters in the volcanic mountains of eastern Michoacan state in central Mexico.
Evidence: SRC-DSC-936652E39DStatement code: CLM-ENT0390-DSC-03
Approved version OWNER-REVIEW-20261108T103635695 · last approved 8 November 2026
Sources