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Spring Migration North

Click here for Fall Migration South

Every Spring, monarchs leave their overwintering sites in California, Mexico and the Southern United States around mid-February, begin mating and looking for milkweed to lay their eggs. East of the Rockies their movement is to the Northeast to Northwest until mid-June, then they tend to stay in the local area. During the time of movement, there are several generations of butterflies, usually three to four. (There can be as few as two generations and as many as five each year.)

In most years in the East, by the time monarchs reach a latitude of 39 to 40 degrees (dotted yellow line) all the the monarchs who overwintered have died and the new generations move forward. How this works in the West is less well known.



Spring Migration Map

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