10th International Monarch Monitoring Blitz

The International Monarch Monitoring Blitz is back for its 10th anniversary! From 31 July to 9 August 2026, join the celebration and help search for monarch butterflies and milkweed plants in your area.

Each summer, this 10-day event brings together thousands of volunteers across the continent to help identify priority areas for monarch conservation and guide concrete actions on the ground. Whether you take part once or throughout the entire period, every observation matters.

How to Participate

From planning a group outing with friends and family to simply keeping an eye out during your daily routine, everyone can contribute, whether you are in an urban or rural setting.

Getting involved is simple: during the 10 days of the Monarch Blitz, head outside, look for milkweed plants and monarchs (eggs, caterpillars, chrysalises or butterflies) and share your observations through the data platform of a participating community program. It’s that easy!

Celebrating 10 Years of North American Community Science

The Monarch Blitz is a unique cross-border effort to conserve one of North America’s most iconic migratory species: the monarch butterfly. Because monarch butterflies migrate across the continent, cross-boundary collaboration is essential to better understand the species, its movement patterns and the habitats it depends on.

Over the past decade, tens of thousands of volunteers across North America have contributed observations that have helped scientists identify priority areas for conservation, track population trends and guide on-the-ground habitat restoration. Together, this regional effort is helping conserve a species that connects ecosystems and communities across the continent.

From scientific publications to educational workshops, community gatherings and outdoor events, discover the wide-ranging impact of this volunteer-driven initiative across North America.

The Monarch Blitz is organized by a collaboration of organizations across North America, including: the Commission for Environmental Cooperation (CEC), the Insectarium de Montréal | Espace pour la vie, Environment and Climate Change Canada (ECCC), the Canadian Wildlife Federation (CWF), the Monarch Joint Venture, Journey North, the U.S. Fish and Wildlife Service (USFWS), the Xerces Society for Invertebrate Conservation, Profauna, A.C. and Mexico’s National Commission of Protected Natural Areas (CONANP).