Wildlife

Wild Monarch Butterfly Migration and Overwintering

Monarch butterfly migration is one of nature's greatest spectacles, now severely threatened.

Key Facts

Eastern monarchs travel up to 4,500km from Canada to Mexican overwintering sites
Oyamel fir forests in Mexico host millions of overwintering monarchs
Illegal logging has reduced overwintering habitat by 80% since the 1990s
Climate change is disrupting migration timing and increasing storm events

Welfare Considerations

Monarchs that cannot complete their migration die of exhaustion and starvation without reaching overwintering sites. Those that reach degraded overwintering habitat face cold, starvation, and death in unusually cold weather without adequate tree cover. Storms that kill millions of overwintering monarchs simultaneously represent mass individual suffering. Protecting migration corridors and overwintering habitat prevents individual butterfly deaths at scale.

What You Can Do

Plant native milkweed and nectar plants in your garden
Support monarch waystations along migration corridors
Donate to World Wildlife Fund Mexico's overwintering site protection
Advocate for milkweed restoration in agricultural landscapes