The Blue-winged Warbler breeds throughout the eastern U.S. from southeastern Minnesota, east to northern New Jersey and south through the northern Gulf Coast states west to Missouri, although its range is highly fragmented (Gill et al. 2001, Sibley 2014). In Montana, this species has only two records over the past decade (Montana Bird Distribution Committee 2012).
For a comprehensive review of the conservation status, habitat use, and ecology of this and other Montana bird species, please see Marks et al. 2016, Birds of Montana.