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Fall Migration is Underway

The annual fall migration of Monarch butterflies has begun!


According to Journey North, here are the signs that the migration is underway:


"Three Signs Of Fall Migration

Declining daylength (photoperiod) is a central cue that triggers changes in monarchs both in terms of physiology and behavior.

Beginning in mid-August in the north, adults are in diapause when they emerge from the chrysalis. They are full grown — but not reproductively mature. Their reproductive development is on pause. These monarchs will not complete development and begin to mate until next spring in Mexico.

Watch for signs of migratory monarchs:

  • flying in directional flight
  • clustering in overnight roosts
  • nectaring intensely as monarchs shift from breeding to intense feeding. They must build body fat to fuel migration and to survive the winter in Mexico.

Fall Roosts Already Reported

Overnight roosts are a classic sign of fall migration. Three roosts have been reported in Ontario, Ohio and Iowa."


You can track their progress, and report sightings, by visiting here!