western monarch thanksgiving count


2017 Monarch Numbers Are Down, Lengthening a Worrying Trend

Published on February 9, 2017

The number of monarch butterflies overwintering was down this winter in both coastal California and in Michoacán, Mexico, according to recent announcements by the Xerces Society’s Western Monarch Thanksgiving Count and World Wildlife Fund–Mexico. In California, the Xerces Society’s Western Monarch Thanksgiving Count reported a total of 298,464 monarchs—a fraction of the 1.2 million reported Read more …


The Western Monarch Thanksgiving Count at 20: A record volunteer effort, but disappointing butterfly numbers

Published on February 7, 2017

In the fall of 1997, a small group of dedicated monarch scientists and volunteers set out to count how many monarch butterflies were overwintering in California, an essential step in understanding and conserving this remarkable insect and its migration. Twenty years later, the Western Monarch Thanksgiving Count (WMTC) is established as one of the longest Read more …


Western Monarch Conservation: A 40 Year History

Published on February 5, 2017

It was in 1976, at the World Congress of Entomology, held in Washington. D.C., when the North American migratory monarchs were named the number one priority in world butterfly conservation. The Mexican overwintering grounds had just been located the year before, one of the greatest natural history developments of the twentieth century, and a whole Read more …


Five lesser-known places to see monarchs overwintering in CA

Published on November 23, 2016

As the Western Monarch Thanksgiving Count kicks into full swing, trained “monarch spotters” will be out and about documenting overwintering populations at hundreds of sites across California. While you may be familiar with the impressive monarch clusters, family-friendly amenities, and helpful docents at Pismo Beach, Pacific Grove, Natural Bridges, and Ardenwood Historic Farm there are many more places monarchs overwinter along the coast. Monarch enthusiasts at all levels can take pleasure in hunting down large collections of the colorful butterflies at some of these lesser-known overwintering sites.


Celebrating 20 years of the Western Monarch Thanksgiving Count!

Published on November 11, 2016

As the days get shorter and monarchs make their way to the forested groves along the California coast to settle in for the winter, volunteers for the Xerces Society Western Monarch Thanksgiving Count are preparing to head out to observe and monitor this migratory phenomenon. This year is particularly exciting because it marks the 20th Read more …


Russian explorers first to document monarch butterfly in California

Published on October 28, 2016

It’s October 2016. For a few weeks monarchs have been trickling in from all over the west and aggregating in groves along the California coast to settle in for the winter. Many people have regarded this event as an annual treat, looking forward to the return of the monarchs as surely as the swallows return Read more …


Monarchs Overwintering in Coastal California Show Steep Decline Since the Late 1990s

Published on July 8, 2016

A new report, State of the Monarch Butterfly Overwintering Sites in California, released by the Xerces Society shows that in less than two decades the number of monarchs which overwinter along the California coast declined by an alarming 74% . This significant loss of butterflies mirrors the troubling trend seen in monarchs in central Mexico Read more …


Butterflies and Volunteers: The Western Monarch Thanksgiving Count

Published on February 4, 2016

The final results from the Xerces Society’s annual Western Monarch Thanksgiving Count have just been released, and the numbers are promising. Volunteers visited 187 sites this year and counted 271,924 monarchs, which is higher than last year. However, the average number of monarchs per site is not significantly different from last year, and this year’s Read more …