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Fall Migration South

Click here for Spring Migration North

In the third or fourth generation (or later) of Monarchs each year the urge to reproduce is suppressed triggering diapause and the migration South. In the East, this usually begins by August 15th when Monarchs in Winnepeg, Canada begin showing directional flight South and Southwest. As they fly they pick up new butterflies so it can appear like a wave in the central part of the United States. The migration of Monarchs also occurs in the Western United States but is less well understood.

Monarchs reach their overwintering sites in California and Mexico near November 1st and continue arriving until the first week of December. They remain in clusters until Spring when the cycle begins again.

Fall Migration Map

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