2024 International Monarch Monitoring Blitz

The International Monarch Monitoring Blitz is back for its eighth edition from 26 July to 4 August 2024! The Blitz provides a unique opportunity for individuals and organizations in Canada, Mexico and the United States to join forces across international borders to safeguard this iconic North American species.

Since monarch butterflies and milkweed populations cover such an extensive portion of North America, the participation of volunteer community scientists is key for furthering our understanding of these species. In the context of climate change, the range of monarchs and milkweed is likely to be impacted, highlighting the need for gathering and analyzing robust, long-term data in order to better understand population and habitat trends.

For the 10-day period, the Monarch Blitz invites people from across North America to report monarch butterfly sightings, to find milkweed plants, and look for monarch eggs, caterpillars and chrysalises. To take part, simply go outdoors and share your monarch and milkweed observations with one of the participating community science programs indicated below.

• Canada:
  • Mission Monarch (mission-monarch.org)
  • iNaturalist Canada (inaturalist.ca)
• Mexico:
  • Naturalista (naturalista.mx)
  • Correo Real Program (correoreal.mx)
• United States:
  • Journey North (journeynorth.org)
  • Monarch Larva Monitoring Project (mlmp.org)
  • Western Monarch Milkweed Mapper (monarchmilkweedmapper.org)
  • iNaturalist (iNaturalist.org)