Area occupied by monarchs in Mexico from 1994 to 2022
Each winter, the population of monarchs that reached overwintering sites in Mexico is measured in hectares. A hectare is a square unit that equals 100 acres.
A bar chart showing the total area occupied by monarchs at overwintering sites in Mexico every year from 1994 to 2022 winter seasons. The measure varies each year but is trending downward with an all-time low in the 2013-2014 season.