Surveys for nesting Limnothlypis swainsonii (Swainson's Warblers) were conducted in the Appalachian mountains of northwestern South Carolina (Pickens County) during the breeding seasons from 1999 to 2003. A total of 74 nests were located, of which 60 (81%) were found in young (small) Tsuga canadensis (eastern hemlock). This nest-site selection tendency in montane populations has not been described. Habitat data collected in 1999 revealed trends of nests placed low, supported by multiple stems, close to the main tree stem, well concealed from above with leaf litter, poorly concealed from below and relatively close to streams. We suggest that conservation of areas in the Southern Appalachians where eastern hemlock is a component of the forest may play an important role in Swainson's Warbler conservation.