Largest monarch population since 2007 announced

Monarch Joint Venture
Jan.30, 2019

The eastern North American monarch population estimate for the winter of 2018-2019 reports a population size of 6.05 hectares, as announced today by WWF- Mexico and the Comisión Nacional de Áreas Naturales Protegidas (CONANP). This is the largest population we have seen since 2007, an increase of 144% compared to last year.


The large population this year is an encouraging sign for monarchs, and an inspiration for us to continue our work together. Good weather conditions during the breeding season supported the increase, as well as efforts across North America to protect and restore habitats. However, we cannot rely on persistent good growing-seasons to sustain monarchs into the future. Our efforts to get more high quality habitat in the ground matter for monarchs, and they must continue.


“We are invigorated by the good news about the eastern population this year,” said Wendy Caldwell, Executive Director of the Monarch Joint Venture, “but there is much work left to be done. With the recent release of an extremely small western population, we strive to embrace an all hands on deck approach to rebuilding this population and continuing to grow and sustain the eastern population.”



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