International Monarch Monitoring Blitz

The International Monarch Monitoring Blitz returns for its ninth edition, from 25 July to 3 August 2025. This annual event invites individuals and organizations across Canada, Mexico and the United States to participate in a trinational effort to collect data on monarch butterflies (Danaus plexippus) and milkweed plants (Asclepias spp.), essential for the species’ survival. Organized by ten partner organizations across North America, the Blitz encourages everyone to contribute to monarch butterfly conservation through simple, yet impactful, actions.