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:
|Lattitude||Midpoint||Peak in monarch abundance|
|43||11 Sept||3-15 September|
Guides for tagging monarchs: