Area of Forest Occupied by the Colonies of Monarch Butterflies in Mexico, During the Overwintering Period 2025-2026

This WWF-Mexico led survey measures the area of forest where monarchs establish their colonies to hibernate each winter, providing a scientifically robust indicator of their population status. This year, scientists found monarchs occupied 7.24 acres of forest compared to 4.42 acres the previous winter—indicating a 64% increase of monarchs during this perio