Monarch butterfly population has nearly doubled

New report confirms that Mexico’s eastern monarch butterfly population has nearly doubled

Published March 14, 2025

The population of the eastern monarch butterflies in Mexican forests doubled this past winter season compared to the area occupied last year, according to a survey conducted by World Wildlife (WWF) Mexico and the National Commission of Natural Protected Areas (Conanp), in collaboration with local communities.

The annual survey, dubbed “Forest Area Occupied by Monarch Butterflies Colonies in Mexico During the 2024-2025 Hibernation Season,” revealed that the occupied area went from 1.79 hectares, to 0.90 during the 2023-2024 period. Despite the late arrival of the butterfly — which arrived mid-November — scientists believe that improved weather conditions during the butterfly migration favored the population’s increase.

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