Fourth Annual Monarch Butterflies Walk & Learn – The Presidio

Published on October 17, 2019

Location: Rob Hill Campground, Presidio of San Francisco Date: Saturday, November 30, 2019 Time: 10am-12pm Registration and website: 10 to 10:30 am Warm up activity, monarch experts, information and artifacts 10:30 to Noon Presentation & Walk Rob Hill Campground

Monarch Docent Training – Natural Bridges State Beach

Published on October 16, 2019

Location: Natural Bridges State Beach Date(s): October 16th & 19th Learn how to share monarchs with others! Docent training class Fall 2019, October 16th & 19th. Classes: Sat 12-4 pm & Wed eve 6-9 pm. For applications contact Natural Bridges

Monarch Butterfly Tours – Natural Bridges State Beach

Published on

Location: Natural Bridges State Beach Date: Recurring event daily on -October 19, 20, 26, 27 -November 2, 3, 9, 10, 16, 17, 23, 24, 30 -December 1, 7, 8, 14, 15, 21, 22, 28, 29 Time: 11am-12pm & 2pm-3pm For

Birds & Butterflies in Bolinas with the Marin Audubon Society

Published on October 14, 2019

Location: In and around Bolinas Trip Leader(s): Juan Garcia & Mia Monroe Start Date: Saturday, November 23, 2019 Start Time: 8:30 AM End Time: 2:30 PM Description: The Pacific edge of Southern Marin County hosts rich habitats for landbirds, shorebirds,

Monarch Butterfly Monitoring Training – San Leandro

Published on October 13, 2019

Monarch Butterfly Monitoring Training Location: San Leandro Public Library: Mulford-Marina Branch, San Leandro, CA Date: November 2, 2019. 9am-12:30pm Led by: Susan Ramos and Mia Monroe Registration for this training is required. To register and get more information visit the

Dennis Frey passed away August 3, 2019, Nipomo, CA

Published on August 27, 2019

The monarch community sadly lost a leader on Saturday, August 3, 2019, when Dennis Frey passed away. His contributions to the lives of many include the creation of the Monarch Alert Program at Cal Poly, the Western Monarch Thanksgiving Count,

Community Science Powers New Western Monarch Studies

Published on July 31, 2019

Western monarch researchers and community scientists have been busy, contributing information vital to understanding the situation facing this imperiled population of America’s most well-known butterfly. Four new studies on western monarchs were recently published as part of the special issue

Monarch Conservation Webinar – Western Monarch Population Down by 99%: How You Can Help

Published on February 11, 2019

Location: Online webinar Date & Time: Tuesday, February 26th, 2019 at 2 PM Eastern Time Description: Have you heard about the steep decline in the Western monarch population? Are you wondering how you can help? This webinar will explore the citizen

Monarch Butterflies in Western North America in Jeopardy

Published on January 17, 2019

Population of monarchs overwintering in California at lowest level ever recorded Media Contacts: Emma Pelton, Endangered Species Conservation Biologist; [email protected], (971) 533-7245 Sarina Jepsen, Endangered Species Program Director; [email protected], (971) 244-3727 PORTLAND, Ore.; Thursday, 1/17/19—The population of monarch butterflies overwintering in California

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

Published on

Working at a conservation nonprofit means that we often come across bad news, but the results from this winter’s Western Monarch Thanksgiving Count left us shocked: an all-time record low of 28,429 monarchs at 213 sites. This number is an 86%

San Francisco Chronicle article “California’s most famous butterfly nearing death spiral”

Published on January 16, 2019

“An alarming, precipitous drop in the western monarch butterfly population in California this winter could spell doom for the species, a scenario that biologists say could also plunge bug-eating birds and other species into similar death spirals. Only 28,429 of

Preliminary Thanksgiving 2018 count results

Published on November 29, 2018

Each year, during a three-week period around Thanksgiving, scores of volunteers fan out through coastal California to find and count overwintering monarch butterflies as part of the Western Monarch Thanksgiving Count. The results are eagerly awaited, as the count provides the

Second New Year’s Count Supports Monarchs Movement Between Sites

Published on March 8, 2018

The Xerces Society’s Western Monarch Thanksgiving Count provides a long-running record of the number of monarchs overwintering in California—including the steep decline of recent decades. Volunteers and biologists who take part in the Thanksgiving Count have been invaluable in monitoring

Newly released monarch overwintering site management plan provides blueprint for protecting and managing monarch groves

Published on March 2, 2018

The Xerces Society for Invertebrate Conservation, Groundswell Coastal Ecology, California Department of Parks and Recreation, and the U.S. Fish and Wildlife Service have developed a western monarch butterfly overwintering site management plan that also serves as a template for land

Western Monarch Butterflies Continue to Decline

Published on February 1, 2018

FOR IMMEDIATE RELEASE Contacts: Sarina Jepsen, Endangered Species Program Director, The Xerces Society for Invertebrate Conservation, (971) 244-3727, [email protected] Emma Pelton, Conservation Biologist, Endangered Species Program, The Xerces Society for Invertebrate Conservation, (503) 232-6639, [email protected] Western Monarch Butterflies Continue to

New study shows dramatic decline in the population since the 1980s

Published on September 7, 2017

A new study published today in Biological Conservation shows a dramatic decline in the California overwintering population of monarchs in the past three decades. Press release below: Monarch butterflies disappearing from western North America New study reveals that western monarch

First New Year’s Count Completed

Published on June 8, 2017

Volunteers with the Western Monarch Thanksgiving Count have been monitoring the numbers of monarch butterflies overwintering in California every fall for the last twenty years. To better understand overwintering monarch clusters’ persistence during the overwintering season, the Xerces Society and

Monterey Herald article “It’s time for the monarch count!”

Published on November 22, 2016

“Pacific Grove >> With deep concentration, they direct their gaze up the trees that play host to slumbering butterflies, silently counting the orange insects until they share their tally with neighboring volunteers. As monarchs flock to the verdant groves along

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

Monarch butterflies and great ways you can help them

Published on November 10, 2016

“Last November, Berkeleyside published an article about a spectacular natural phenomenon seen in Berkeley for the first time: hundreds of monarch butterflies were clustering in the trees of Aquatic Park. This fall, thoughtful reader and independent gardener Toni Cox wrote

Russian explorers first to document monarch butterfly in California

Published on October 30, 2016

200 years ago, monarchs were observed along the CA coast – will they be there two centuries from now? Learn more on the Xerces Society Blog.

Monarchs arriving at the Pacific Grove butterfly grove

Published on October 27, 2016

Monarch butterflies are slowly arriving at the Pacific Grove butterfly grove. Nick Stong, who counts monarch butterflies at Pacific Grove every Saturday, is encouraged by the numbers of butterflies that have arrived in the last few weeks. Read more in

New report on the State of Overwintering Sites in California

Published on July 8, 2016

A report released today by the Xerces Society shows a sharp two-decade decline in the number of monarchs which overwinter along the California coast and prioritizes the top 50 overwintering sites most in need of conservation and management attention. State

Monarch SOS app launched: a new way to collect monarch data

Published on May 5, 2016

A new version of the Monarch SOS app for iPhone is now available through iTunes! This free app developed by Naturedigger includes many monarch citizen science projects and the newest version adds two Xerces projects: Western Monarch Count– for monitoring

Monarch Numbers Up in Mexico, But Still a Long Journey to Recovery

Published on February 26, 2016

Favorable weather boosts Mexican overwintering population but numbers remain relatively low. PORTLAND, Ore., February 26, 2016 — The latest count of monarch butterflies overwintering in Mexico found that the population which will migrate to the United States rebounded again this

Assessment of Western Monarch Butterfly Winter Population Completed

Published on February 4, 2016

The Xerces Society for Invertebrate Conservation, Portland, OR More monarchs reported in Northern California this year, but monarchs are not yet recovered PORTLAND, Ore., February 4, 2016 — Results from a survey of monarch butterfly overwintering sites in California show

New study on the natal origins of overwintering monarchs

Published on January 26, 2016

A new study by UC-Davis illuminates the natal origins of monarch butterflies overwintering in California. The study by Louie Yang (Dept. Entomology at UC-Davis) used stable hydrogen isotope analysis to test tissue samples from 114 butterflies at 4 overwintering locations. The

New data suggests 2015 a good year for monarch butterflies

Published on December 18, 2015

New data suggests the number of monarch butterflies in California has grown this year. That’s good news since the population of this near-threatened species has been thin in recent years. “We are really pleased to see that the number of

Monarch count: Pacific Grove numbers down this year

Published on

The monarch butterflies have returned to Pacific Grove, but this year there may be fewer of them. Volunteers and officials with the Pacific Grove Museum of Natural History recently counted 11,000, down from 18,000 this time last year. That count

Monarch Butterflies of Ellwood Mesa

Published on

Monarch butterflies travel hundreds of miles each fall to bask in the warmth of secluded eucalyptus, Monterey pine and coast live oak groves along the central California coast. They cluster in the hundreds and even thousands, appearing as a mass

Early data from Western Monarch Thanksgiving Count suggests a small increase in butterfly numbers in some parts of the overwintering range

Published on December 14, 2015

Populations of monarch butterflies are still far below historic numbers PORTLAND, Ore., December 14, 2015 — First reports from monarch overwintering sites in California surveyed during the Xerces Society’s Western Monarch Thanksgiving Count suggest that 2015 may have been a

Migrating monarchs bring out citizen scientists in the holiday season

Published on December 5, 2015

Every autumn, the western North American population of monarch butterflies migrates from the lands west of the Rocky Mountains to the coast of California, where they spend the winter at about 200 sites scattered throughout the coastline. Last winter, I

Hundreds of monarch butterflies cluster in Berkeley’s Aquatic Park

Published on November 23, 2015

In late October, Berkeleyside received a tip that thousands of tiny fish were jumping in the waters of Aquatic Park. Less than three weeks later, we received another “scoop” about the park that throngs of monarch butterflies were clustering in

Monarch Welcoming Committee

Published on November 17, 2015

“These butterflies migrate thousands of miles, but the more amazing part is that even with four or five generations between them, they still return to these same branches,” explained Charis Van der Heide, who is a docent at the Coronado


Return to top