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  • Spring Monarch Migration
    As of May 1, 1997

    Before March 1 Red
    March 1-March 15 Gold
    March 16-March 31 Brown
    April 1-April 15 Magenta
    April 16-April 30 Yellow

    Here's the latest snapshot of this spring's monarch migration, thanks to Carol Gersmehl and Kara Elmquist of Macalester College . This map shows the extent of the migration as of May 1, 1997. (Click on the map and it will enlarge to a full-screen image.)