Monarch Population Status

The WWF-Telmex Telcel Foundation Alliance, in collaboration with the National Commission of Natural Protected Areas (CONANP), the National Autonomous University of Mexico (UNAM), and the Monarch Butterfly Biosphere Reserve (MBBR), announced the total forest area occupied by overwintering monarch colonies today. Nine (9) colonies were located this winter season with a total area of 2.93 hectares, a 64% increase from the previous season (1.79 ha).

Figure 1. Total Area Occupied by Monarch Colonies at Overwintering Sites in Mexico.

WWF Reports (Spanish):
• 2025 Monitoreo Mariposa Monarca en México 2025-2026
• Monitoreo Forestal en la zona núcleo de la RBMM 2024-2025

WWF Reports (English):
• Area of Forest Occupied by Monarch Butterfly during the Winter 2025-2026
• Forest Degradation in the Core Zone of the MBBR 2024-2025

WWF story: Monarch butterfly population increases by 64%

Additional details will be posted as they become available.

Note: The WWF-TELMEX Telcel Foundation Alliance collaborates with CONANP to systematically monitor the hibernation of the Monarch since 2004, and they join the Institute of Biology of the National Autonomous University of Mexico (UNAM) to analyze changes in forest cover in the area core of the Monarch Butterfly Biosphere Reserve in order to have scientific bases that support the implementation of conservation strategies for the benefit of the species, ecosystems and human beings.