Butterflies of the Colorado Front Range was created by Catherine Cook, Donn Cook, and Joe Krieg, longtime volunteer naturalists with Boulder County Parks and Open Space. The website grew from our shared interest in the butterflies of the Colorado Front Range and from decades of field experience, study, and collaboration with other naturalists and butterfly enthusiasts. It was developed as a resource for anyone interested in learning about and identifying the butterflies of this region.

We are especially grateful to Robert Michael Pyle, Paul A. Opler, Jim P. Brock, Roland H. Wauer, Ray Stanford, Janet R. Chu, and Jeffrey Glassberg for sharing their knowledge and expertise and helping us better understand the butterflies of Colorado. We are also deeply grateful to the Boulder County Nature Association (BCNA), which hosts and sponsors this website, and to the many people who have contributed their knowledge, observations, and photographs.

This website continues to grow and improve through the generosity and contributions of the butterfly community.

References

The following books, publications, and online resources have been especially valuable in developing the species accounts:

• Butterflies of Rocky Mountain National Park, Leslie Angel (2005)
• Butterflies of North America, Jim P. Brock and Kenn Kaufman (2003)
• The Butterflies of Cascadia, Robert Michael Pyle (2002)
• Butterflies through Binoculars: The West, Jeffrey Glassberg (2001)
• A Field Guide to Western Butterflies, Paul Opler (1999)
• Peterson First Guide to Butterflies and Moths, Paul Opler (1994)
• Butterflies and Moths of North America hosted and maintained by Kelly Lotts and Thomas Naberhaus of the Butterfly and Moth Information Network.
• Handbook for Butterfly Watchers, Robert Michael Pyle (1984)
• The Audubon Society Field Guide to North American Butterflies, Robert Michael Pyle (1981)
• Caterpillars in the Field and Garden, Thomas Allen, Jim Brock and Jeffrey Glassberg (2005)
• AMERICAN BUTTERFLIES, Quarterly Journal of the North American Butterfly Association (NABA)
• Butterflies of the Colorado Front Range: A Photographic Guide to 80 Species, Janet R. Chu and Stephen R. Jones (2011)
• Butterflies of the Colorado Front Range: A Photographic Guide to 100 Species, 2nd Edition, Janet R. Chu and Stephen R. Jones (2020)

Image Credits

We gratefully acknowledge the photographers who have generously given permission for their photographs to be used on this website:

John S. Barr, Janet R. Chu, Catherine Cook, Wade Curran, Chris Friedman, Harold Goerzen, Sue Hirshfield, Richard Holmes, Stephen R. Jones, Venice Kelly, Nick Komar, Joe Krieg, Karen Krieg-Clark, Leslie Larson, Ted Muller, Christian Nunes, Brian Perry, Pam Piombino, Gordon Revey, Bryan Reynolds, Ellen Shannon, Mary Jane Voogt, Glenn Walbek, and Roland H. Wauer.

All photographs are credited to the photographer and remain the property of the photographer.

Copyright

All photographs on this website are copyrighted and remain the property of their respective photographers. Photographs may not be copied, reproduced, or used without the photographer's written permission and proper attribution.