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Map shows when monarch migration peaks where you live
Monarch Watch said millions of butterflies are migrating south, with peak timing varying by region and about 99% of eastern monarchs heading to Mexico.
Millions of monarchs are traveling across the United States as fall begins, stopping only at night during their annual journey south.
About 99% of monarchs live east of the Rocky Mountains and migrate south through Texas to Mexico for winter, while a smaller population travels to the California coast.
Some monarchs travel as far as 3,000 miles, with peak abundance times varying by geography; the Southern United States sees peak migration around late October.
Monarch Watch calculated these migration estimates using submitted data, and organizations recommend people plant milkweed to support conservation of the traveling insects.
Monarchs are not protected under the Endangered Species Act, yet their population has declined over several decades, making conservation efforts increasingly critical.