monarch gripping cedar branch

Photo By/Credit
Joanna Gilkeson/USFWS
Media Usage Rights/License
Public Domain
Monarch butterfly gripping a cedar branch in Santa Cruz, Calif. Many people know that monarchs overwinter in large clusters in Mexico, but did you know monarchs living west of the Rocky Mountains overwinter at a few dozen sites along the Calif. coast? Monarchs spend the cool winter months clustered in trees to protect themselves from cold or rainy weather, waiting for the milkweed and flowers that come with springtime.