Brazilian Free-tailed Bats (Tadarida brasiliensis) had never been documented as breeding in southern Oregon. In 2017 and 2018, however, we report a natal colony of Brazilian Free-tailed Bats in southern Oregon, approximately 145 km west-northwest of the closest-known natal colony of this species, located in Lava Beds National Monument. The expansion of maternity sites may be the result of range expansion in response to warmer temperatures in the region owing to climate change and/or to adaptations to man-made structures for roosting.