Monarch Migration

The Monarch colonies at the overwintering sites in Mexico are breaking up and spring
migration is underway! Spring migration begins every March in a flurry. The monarchs are in a
race against time. They can't stay in Mexico any longer — but they can't
move north too quickly either. The timing of the monarch's spring
migration must be precise. Why do they go now, and how do they know when
to leave?

Interested in tracking their journey north? Follow along at Monarch Butterfly Journey North