Bombus pensylvanicus is widespread in the eastern U.S. and Great Plains regions, throughout the central U.S. and extreme southern Canada. Though absent from much of the Mountain West, it is found in the Desert West and adjacent areas of California and Oregon.
Historically, Bombus pensylvanicus was among the broadest ranging bumblebees in North America. However, numerous studies indicate that this species has recently declined, both locally and regionally, especially in the northern parts of its range. Read More