The Trout Creek mule deer herd is composed of residents and migrants that make short-range elevational migrations. Mule deer mainly winter at lower elevations surrounding Blue Mountain and the slopes of the Oregon Canyon Mountains. In spring, some of these mule deer migrate to higher elevations in the Oregon Canyon Mountains. Other members of the herd winter in the southwestern portion of the herd’s range, inhabiting areas near Hawks Mountain, the Pueblo Mountains, and the foothills of the Trout Creek Mountains. These mule deer migrate to summer ranges on the crests of Holloway Mountain and the Trout Creek Mountains. Notably, one mule deer formerly wintering on the Trout Creek Mountains migrated south from a summer range on the Nevada border to the Montana Mountains during the second documented winter before returning to Oregon in spring. Habitat on winter ranges consists of A. t. wyomingensis (Wyoming big sagebrush) plant communities and non-native annual grasslands. Summer ranges consist mainly of native grasslands, mountain big sagebrush plant communities, and mountain shrub communities. The Trout Creek mule deer herd faces several threats, including summer wildfires, highway barriers, and competition for resources. In 2012, the Holloway fire burned 462,017 acres (186,972 ha) including most of the Trout Creek and Oregon Canyon Mountains, resulting in the temporary loss of shrub cover at higher elevations and conversion of native forbs and shrubland to invasive annual grasses at lower elevations. Although no migratory mule deer attempt to cross U.S. Highway 95, some resident mule deer have ranges spanning the busy highway, which had an AADT value of 2,095 vehicles in 2018. The Trout Creek mule deer herd also borders the Barren Creek Complex HMA to the north and the Beaty Butte HMA to the east (DOI and BLM, 2020; BLM 2022). The Barren Creek Complex HMA contains approximately 2,500 feral horses while the Beaty Butte HMA contains 463 horses. Both feral horse populations surpass the respective maximum appropriate management levels of 892 and 250 horses, respectively, suggesting that mule deer and horses compete for resources in the few areas where ranges overlap. These mapping layers show the location of the winter ranges for mule deer (Odocoileus hemionus) in the Trout Creek population in Oregon. They were developed from 51 migration sequences collected from a sample size of 28 animals comprising GPS locations collected every 5 hours.