Elevated ground-level ozone has been observed in the wintertime in two air basins in the western US. These basins have extensive oil and gas production operations that involve a unique combination of NO_x and VOC sources, in conjunction with persistent cold pool conditions creating a shallow boundary layer over snow-covered ground. The Uintah Basin Winter Ozone Studies (UBWOS) took place during the winters of 2012, 2013, and 2014 in the northeast corner of the state of Utah. The goal was to obtain a detailed understanding of the chemistry causing high ozone in this air basin to inform the development of effective control strategies that could be implemented. This special issue will collect papers describing some of the measurement techniques employed and analysis of the extensive data sets of VOC, odd-nitrogen, radical source species, fine-scale meteorology, and spatial distributions of O₃.