Four Generations
Monarchs can produce a new generation in about 30 days, resulting in four generations during the typical breeding season. The population grows with each new generation so monarchs become increasingly noticeable as the summer wears on.

The Migratory Generation
This fall, the monarchs that migrate to Mexico will be 4th generation butterflies, the great-great-grandchildren of those that left Mexico last spring. Monarchs born after mid-August will likely be part of the migratory generation. Get ready to watch for signs that the monarchs are on their way to Mexico again.