Monarch Butterfly Migration California 2024 Schedule. Every year, monarch butterflies from all over the western u.s. As millions of monarch butterflies make their way down the east coast to mexico for the winter, butterfly scientists want people in their flight path to report.
In addition, because the migration begins at 50n in early august, and overlaps the breeding season until the first week of october, i will say a few words about what to expect during the migration. Volunteers helping to track monarch butterfly migration and milkweed phenology across north america.