This is a comma separated values (csv) file used to conduct the logistic quantile regression analyses in R provided by Cade et al. (2017. Logistic quantile regression provides improved estimates for bounded avian counts: A case study of California spotted owl fledgling production. The Auk: Ornithological Advances. In press). The data set consists of records of California spotted owl fledgling counts on 88 territories on the Lassen National Forest, CA from 1991-2010. Climatic conditions for various time periods by year for each territory were obtained from PRISM and landscape habitat conditions surrounding owl territories were obtained from LANDFIRE. The owl data were provided by J. J. Keane of the U.S. Forest Service, the climate and habitat data were compiled and meshed with the owl data by B. R. Noon and R. D. Scherer of Colorado State University, and the final data set used for analyses were compiled by B. S. Cade of the U. S. Geological Survey.