Monitoring Western Monarch Declines
The California State Parks Foundation is asking residents across the state to track and report sightings of western monarch butterflies. This initiative runs during California Biodiversity Day, which takes place from September 5 to September 13. Officials state that data collected by the public helps researchers track the species as it faces significant population pressures.
Western monarch numbers have dropped heavily over the last few decades. The causes are clear: climate change, loss of habitat, pesticide use, and disease are all contributing to the decline. The most recent Western Monarch Count recorded a peak overwintering population of only 12,260 butterflies. This number represents the third-lowest total observed since tracking began in 1997. A federal Species Status Assessment suggests a 95% chance of extinction for this population by 2080.
The Role of Public Participation
Public involvement is central to the state's efforts to gather data. Randy Widera, who serves as the director of programs for the California State Parks Foundation, emphasized the value of citizen science. He noted that the western monarch is one of the state's most beloved species. Widera stated, "Californians can play a critical role in preserving our western monarch butterfly population by advocating for the protection of butterfly habitats and helping scientists track butterfly locations."
Residents who want to help should use the free iNaturalist application. The process is straightforward. A user captures a photo of a monarch butterfly or its caterpillar and uploads the image to the app. This information enters a database used by scientists to map monarch locations throughout the year. It also provides key data for the upcoming 30th annual Western Monarch Count.
State Park Habitats and Future Outlook
State parks serve as essential refuges for the species. Research covering 26 years of population data reveals that California state parks host at least 20% of the total overwintering monarchs. In certain years, this figure has topped 50%. The foundation highlights specific sites that have proven popular for the butterflies during recent winters.
During the 2024-25 season, Lighthouse Field State Beach, Natural Bridges State Beach, and Pismo State Beach ranked as top sites. These locations provide the conditions monarchs need to survive the colder months. The current push for reporting sightings is not just about counting individuals. It is about understanding the migratory patterns and habitat needs required to prevent the total collapse of the population. Scientists are watching these numbers closely as the next migration season approaches. Every report from the public adds a data point to the broader struggle against extinction.