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Spring Recolonization of North America
(Eastern Population)

The monarch breeding grounds in eastern North America are 11,000 times bigger than the space the butterflies occupy during the winter in Mexico! The monarchs leave Mexico during the month of March. The first butterflies appear in the United States sometime before March 15th each year. It takes until mid-June for monarchs to reach the extent of their range.

Watch the pattern of recolonization shown in this animation.
(Click to enlarge.)




National Geography Standards

The World in Spatial Terms
How to use maps and other geographic representations, tools, and technologies to acquire, process, and report information.

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