Monarch Butterfly Survey Report 2024-2025

Every year, WWF Mexico and partners survey the sites where the eastern monarch butterfly spends the winter, inside and outside the Monarch Butterfly Biosphere Reserve in Mexico, providing a scientific indicator of the monarch’s population. The latest report, Area of Forest Occupied by the Colonies of Monarch Butterflies in Mexico, During the Overwintering Period 2024-2025, found that the species occupied four acres of forest, which represents an increase of 99% from the winter before, when monarchs occupied 2.2 acres of forest.