When do we tag monarchs in Madison?

• As the length of the day shortens in mid August and September, monarchs in northern latitudes, i.e. near the Canadian border, begin to migrate. Monarchs farther south will begin their journey a few weeks later.
• Tagging and monitoring should begin in late August in all regions, with a concentrated effort made in September and early October. A good rule: when the wild asters, especially New England Aster and goldenrod are in bloom, the monarchs are migrating.

Peak Migration Dates for Madison, WI:

Guides for tagging monarchs:

• Peak Monarch Migration Dates
• Monarch Watch _ Migration & Tagging _ Tagging Monarchs
• MonarchWatchTaggingSystem
• MonarchWatchPreMigrationNewsltr-July2017