The International Monarch Monitoring Blitz invites community scientists from across North America to come together with the shared goal of helping to protect and conserve the beloved and emblematic monarch butterfly. Data collected by volunteers each year support trinational efforts to better understand the monarch butterfly’s breeding productivity, range, and timing in North America.

Join this year’s International Monarch Monitoring Blitz from 26 July to 4 August 2024!

To take part in the Blitz, please share your observations through one of the participating community science programs below:

• Journey North
• Monarch Larva Monitoring Project
• Western Monarch Milkweed Mapper
• iNaturalist

The information collected by North American community science observers helps researchers identify priority areas for monarch conservation actions. Thanks to this engaged community of observers, monarch researchers will soon be able to analyze trends in summer breeding population sizes. All partner organizations have agreed to share volunteer-collected data to a central data repository. In this way, anyone can consult and download Blitz data by visiting the TRINATIONAL MONARCH KNOWLEDGE NETWORK.