News

Save the Date: Celebrate 10 Years of the Monarch Blitz!

Mark your calendars: 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. This is your chance to get outside and make a real difference for one of North America’s most emblematic species! What is the Monarch Blitz? The Monarch Blitz is...

June 22, 2026

Volunteers Breaking Observation Records to Support Monarch Butterfly Conservation Across North America

Tiohtià:ke (Montreal), 23 September 2025 — Over the past 15 years, monarch butterfly populations have faced serious challenges, but conservation efforts continue to grow. Canada, Mexico and the United States share a long history of working together to protect monarchs across their migratory range, including through Commission for Environmental Cooperation (CEC) initiatives like the International Monarch Monitoring Blitz. From 25 July to...

September 23, 2025

2024 Monarch Butterfly Blitz Sets Records for Observations and Volunteer Efforts in North America

Tiohtià:ke (Montreal), 18 September 2024 — From 26 July to 4 August 2024, the 8th annual International Monarch Monitoring Blitz invited individuals, organizations and community scientists from across North America to collect data on monarch butterflies and the milkweed plants essential for their survival. This snapshot of the monarch butterfly and its breeding locations helps scientists better understand how to protect and conserve...

September 18, 2024

Monarch Blitz 2023 Results: Another Successful Year for Community Science in Support of Monarch Butterfly Conservation

Montreal, 11 September 2023—From 28 July to 6 August 2023, the 7th annual International Monarch Monitoring Blitz invited community scientists from across North America to collect data on monarch butterflies and milkweed plants across the monarch butterfly migratory range. This snapshot of the monarch breeding population helps scientists better understand how to protect and conserve one of North America’s most...

September 11, 2023

Monarch Butterfly Conservation Supported by Record-Breaking North American Community Science Monitoring Blitz

The Commission for Environmental Cooperation (CEC) is proud to celebrate and thank volunteers across North America who answered the call to support monarch conservation efforts between 29 July and 7 August 2022. For the second year in a row, engagement in the International Monarch Monitoring Blitz received enthusiastic participation, surpassing the rates of previous years, with a new record of...

October 3, 2022

A graph showing the participation and observation data of the Monarch Blitz between 2017 and 2022.

5th Annual International Monarch Monitoring Blitz Was the Most Successful Ever—Thanks to You!

Montreal, 2 November 2021—The Commission for Environmental Cooperation (CEC), together with the Trinational Monarch Conservation Science Partnership, is pleased to announce the results of the fifth annual International Monarch Monitoring Blitz (Monarch Blitz), which occurred between 23 July and 1 August 2021. More than 2,000 volunteers across 80 states and provinces in North America shared 4,293 observations of monarch butterflies...

November 2, 2021