The Cape May Warbler breeds from southwest Yukon Territory across Canada’s boreal forests to Nova Scotia and the northern regions of the states from Minnesota to Maine. The species overwinters in the West Indies, southern Florida, and the Gulf coast of Central America. The species is an uncommon migrant through Montana with three or fewer observations reported in the typical year (Baltz et al 1998, MTNHP 2019).
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.