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Western Monarch Thanksgiving Count

Western Monarchs: Notes from the Field

Staff from the Xerces Society and our partners have been keeping close eyes on the imperiled western monarch population at study sites in California, Nevada, Oregon, Washington, and Idaho as part of a multi-year collaborative research project.

Photo Essay: Trinational Monarch Meeting and Exploring Mexico’s Monarch Overwintering Sites

Xerces Society Endangered Species Conservation Biologist and Western Monarch Lead Emma Pelton recounts her recent experience in Mexico with this photo essay.

New Year’s Count of Western Monarchs Confirms Decline, Trends Seen in Previous Years

Overall, the count data revealed an average decrease of 38% between the Thanksgiving and New Year’s counts.

Record Low Number of Overwintering Monarch Butterflies in California—They Need Your Help!

We urge you to join us and our colleagues in the western monarch science and conservation community in taking meaningful, swift action to help save western monarchs.

Early Thanksgiving Counts Show a Critically Low Monarch Population in California

The California overwintering population has been reduced to less than 0.5% of its historical size, and has declined by 86% compared to 2017.

Western Monarch Numbers Expected to Be Low this Year

What can you do to help the monarch? Protect habitat, avoid pesticide use, plant gardens, and contribute data to Xerces-led community science efforts.

Very Low Numbers of Monarchs Overwintering in California may Reflect an Unusual Fall

Unusual fall weather may have contributed to the lowest overwintering western monarch population recorded since 2012.

2017 Monarch Numbers Are Down, Lengthening a Worrying Trend

A documented 74% decline in the California overwintering population since the late 1990s mirrors the steep decline, estimated at 80–90%, of the number of butterflies in Michoacán over the same period.

Five Lesser-Known Places to See Monarchs Overwintering in 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.