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News & Updates

Monarch Population Increases by 35% in the 2021-2022 Season

Monarch population increases in 2021-2022 overwintering season.

May 24, 2022

Monarchs occupied a total of 2.84 hectares this overwintering season compared to 2.10 reported in the previous one. The first record of butterflies was documented on September 13 in Ciudad Acuña, Coahuila and the peak of the migration was registered in October 15. During the season, 10 colonies were recorded, six in the Monarch Butterfly Biosphere Reserve and four outside of it. Karen Oberhauser, MBF board member, stated that current numbers indicate that, although this increase is hopeful, monarchs are not “out of the woods”. However, the numbers would be even lower without the efforts of dedicated individuals throughout North America. There is still much to do to help the monarchs!

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