Monarch Butterfly Migration California 2024 Calendar. In the 1980s and '90s, more than a million made the trip. The monarch butterflies that come each year to california are, in a word, spellbinding.

The population of western monarch butterflies wintering along the california coast has rebounded for a second year in a row after a precipitous drop in 2020, but the. The annual monarch butterfly migration is one of the most breathtaking spectacles in the insect world.