North American Butterfly Association

California Sister

NABA Butterfly Counts

The North American Butterfly Association has run the Butterfly Count Program in the United States, Canada, and Mexico since 1993. Each of the approximately 450 counts consists of a compilation of all butterflies observed at sites within a 15-mile diameter count circle in a one-day period. The annually published reports provide a tremendous amount of information about the geographical distribution and relative population sizes of the species counted. Comparisons of the results across years can be used to monitor changes in butterfly populations and study the effects of weather and habitat change on North American butterflies.

Scientists who are interested in obtaining NABA Butterfly Count data for research, please contact us at

Copies of previous NABA Butterfly Count Reports (years 1982-1984, 1986, 1987, 1989-1992, 1994, 1998-2000, 2002-2007, 2010, 2012, 2015, 2016, 2017 and 2018 are also available). Each report is $11 for NABA members and $16 for non-members. Shipping within the U.S. is $2 for the first item and $1 for each additional item. For shipping costs to addresses outside the U.S. please email Please make check payable to NABA and order from the address below.

NABA Butterfly Count
4 Delaware Rd.
Morristown, NJ 07960