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Monarchs have migration plans whenever the months of September, October, and November come by monarchs will travel down south to Central Mexico, which is the beginning of fall migration. Whenever the weather begins to become spring monarchs, in March, they head up north to Canada. Monarchs, unlike many insects, cannot survive all that long in colder or warmer temperatures, which causes them to migrate.
Fall Migration
In the fall, monarchs have an annual migration toward Mexico. In the fall, before monarchs will head down to Central Mexico moving through the central region of the US, some monarchs may break from the journey in the eastern, and western regions of the US. This is because they can't survive long time periods of freezing temperatures. The body fat inside the monarch's abdomen is a key part of survival for the monarch's long journey whilst migrating. In the fall monarchs can travel up to about 3,000 miles during their lengthy adventure.
Spring Migration
The monarchs usually leave Mexico around mid-March. At the end of March, they all have left. When migrating in the spring, monarchs will head towards Canada and can go through the central USA and down the east coasts and sometimes all over the place in the western region of the US. After winter, monarchs begin mating and heading north to find newer milkweed, though they can't leave too early because they won't be able to find a place to lay their eggs. During summer there are 3-4 generations of monarch butterflies.
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