The Timing of Fall Monarch Migration
When Will the Migration Reach You?

Monarch butterflies form roosts during their fall migration. This map shows when and where people reported roosts since fall 2002. People report the first date a roost appeared.

When do monarchs begin to roost where you live? That's the best time to watch for migrating monarchs. (You may see migrating monarchs earlier or later, too.)

Monarch Butterfly Roosts (2002 to present)
(Click to view the migration week by week.)

Try This!
According to the location of monarch butterfly roosts when should you begin to watch for migration in:
  • Ontario?
  • Illinois?
  • Oklahoma?
  • Texas?

Look at the map carefully, then click here for the answer. >>

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.