The fact that the monarch butterfly (Danaus plexippus L.) migrates from Canada to central Mexico is a well-known fact. Here, the migration of the Eastern and Western populations of monarchs is described. This article will not be a field study but an attempt to synthesize a theory of how this migration could originate in a young-Earth context, given that butterflies were created essentially as seen today or will be assumed to have originated this way. The Uvarov Phase Theory is discussed as it applies to desert locusts and its possible relation to the unique migratory generation of monarchs, that is, the larger size of the Fall migratory individuals, and the importance of diapause. The establishment of this interesting migratory pattern is discussed in terms of geography and topography and related to the unique flight abilities of these butterflies.