Monarch Butterfly Migration California 2024 Dates. In the 1980s and '90s, more than a million made the trip. After a harsh drought from oklahoma to mexico caused the monarch butterfly population to deplete, here's what to expect from the spring migration.


Monarch Butterfly Migration California 2024 Dates

Only a few monarchs remain in the monarch butterfly biosphere reserve in mexico. Volunteers helping to track monarch butterfly migration and milkweed phenology across north america.

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