The eastern monarch population is up slightly — but still far below historic numbers

Area occupied by monarchs that overwinter in Mexico, in acres.

(Please use a modern browser to see the interactive version of this visualization)

Data collected in December and January (e.g., the most recent year of data is from December 2025 and January 2026).

Chart: Benji Jones/VoxSource: Rendón-Salinas, WWF-Mexico, et al. (2026)