The Western Monarch Thanksgiving & New Year’s Counts
The Western Monarch Thanksgiving Count and New Year’s Count are the product of annual monitoring efforts by volunteer citizen scientists to collect data on the status of monarch populations overwintering along the California coast (and a few sites from inland areas). Thanks to the extraordinary efforts of these volunteers, we have over 20 years of data demonstrating that monarchs have undergone a dramatic decline in the western U.S.
The data collected by volunteers are compiled and entered into the Xerces Society’s Western Monarch Overwintering Sites Database which also includes many historic counts and survey efforts. Contact [email protected] if you are interested in obtaining a copy of the entire database.
You can download the Thanksgiving and New Year’s for every year by clicking on the PDF or excel links below. The graph of Thanksgiving count totals and monitoring effort is updated each year.
Results from the 2018 Western Monarch Thanksgiving Count are now available!
Data Citation: Xerces Society Western Monarch Thanksgiving Count. 2019. Western Monarch Thanksgiving Count Data, 1997-2018. Available at www.westernmonarchcount.org.
Click here for a larger version.
Results from the 2018-2019 Western Monarch New Year’s Count are here!
Figure 1. Monarch abundance at the 130 overwintering sites in California visited during both the Thanksgiving and New Year’s Counts during the 2018 – 2019 count season.
Previous years data: