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Monarch Joint Venture Blog

Eastern Monarch Numbers Increase, But Conservation Efforts Still Critical

Mar 06, 2025

Categories

  • Migration
  • Population Trends
  • Recent Research
  • Monarchs in Mexico

The eastern monarch butterfly population in Mexico’s oyamel fir forests this past winter occupied 1.79 hectares, according to the latest survey released by the World Wildlife Fund-Telmex Telcel Foundation Alliance (WWF) and the National Commission of Protected Natural Areas in Mexico (CONANP). This represents a 99% increase from last year’s 0.9 hectares in the 2023-2024 overwintering season. Read More

Eastern Monarch Butterfly Population Falls to Less than One Hectare in the 2023-2024 Overwintering Season

Feb 07, 2024

Categories

  • Migration
  • Population Trends
  • Recent Research
  • Important Monarch News

Monarch butterflies occupied 0.9 hectares, 1.31 less than the 2.21 hectares in the 2022-2023 overwintering season. This is the first time since the 2013-2014 overwintering season that the eastern monarch population has occupied less than one hectare. Read More

2021 Thanksgiving Count Shows Almost 250,000 Overwintering Western Monarchs: Let’s Celebrate, and then Get to Work

Jan 25, 2022

Categories

  • Community Science
  • Migration
  • Population Trends
  • Important Monarch News

With the 2021 Thanksgiving Count showing almost 250,000 overwintering western monarchs, conservationists are relieved, and also scratching their heads. Read More

Monarchs and Día de Muertos in Mexico

Nov 02, 2020

Categories

  • Migration

The annual return of monarch butterflies to Mexico coincides with Día de Muertos and carries strong cultural significance in Michoacán and the State of Mexico. Read More

Field Notes: State of Mexico, Mexico, January 28-February 1, 2019

Feb 25, 2019

Categories

  • Conservation Stories
  • Migration
  • Population Trends

Alison Cariveau, MJV Science Coordinator, shares her recent visit to Mexico to participate in the Trinational Monarch Science Meeting, and visit a monarch overwintering sanctuary. Read More