Utility-scale solar energy developments (USSE) are increasingly being constructed in remote areas that often serve as critical habitats for wildlife, including winter ranges occupied by mule deer. The implications of USSE on native ungulates have not been thoroughly investigated. Mule deer, whose populations are declining in parts of their range, depend heavily on winter ranges that often are targeted for USSE and is likely to have negative effects on their populations. Our objective was to identify priority habitat for mule deer in South-Central Oregon to inform decisions on siting solar facilities. We used resource selection functions to identify priority habitats for mule deer on winter range. Additionally, we examined the effects of current solar facilities on movement patterns and selection of resources by mule deer. Mule deer selected areas of low elevation and close to water on winter range. Areas of high priority for USSE developments overlapped critical winter range for mule deer. Effects of solar developments on movements and selection of habitat by mule deer was larger than the footprint of the facility. These data offer an essential opportunity to model potential impacts of solar facilities on mule deer populations before placement of additional facilities and will be used to inform siting decisions.