Join the 2025 International Monarch Monitoring Blitz: 25 July to 3 August
from CEC (Commission for Environmental Cooperation) –edited slightly
Mark your calendars! 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.
How to Participate:
1. Choose iNaturalist.ca (Canada)
2. Observe and Report: Between 25 July and 3 August 2025, head outdoors to look for milkweed plants and monarch butterflies in any life stage—egg, caterpillar, chrysalis or adult butterfly. Document your observations following the protocol of the community science program of your choice.
3. Have fun! Share pictures on social media, using #MonarchBlitz. If you are an organization, we encourage you to fill out this form so we can highlight your Blitz activities and feature your logo on the Blitz webpage!
Data collected during the Blitz are published in the Trinational Monarch Knowledge Network, a repository of information available for anyone to consult and download. This snapshot of monarch and milkweed distribution helps scientists better understand how to protect and conserve one of North America’s most iconic species.
The Blitz is organized by a collaboration of organizations from across North America, namely 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).
For more information on how to get involved, visit monarchblitz.org and follow #MonarchBlitz on social media.