where do monarch butterflies go in the winter time
Monarch butterfly migration The monarchs begin their southern migration September to October. Eastern and northeastern populations, originating in southern Canada and the United States, travel to overwintering sites in central Mexico. They arrive at their roosting sites in November. They remain in their roosts during the winter months and then begin their northern migration in March. No individual butterfly completes the entire round trip. Female monarchs lay eggs for a subsequent generation during the northward migration.[2] Four generations are involved in the annual cycle.