This small greenish flycatcher is easily overlooked in the moist, shady forests where it makes its summer home. It is a common to abundant breeder in forests of the Coast Range and west Cascades below about 4,000 feet and a common transient in western Oregon.
The Pacific-slope flycatcher is most easily detected and identified by voice, but there is incongruence between published descriptions of vocalizations and some birds heard in the field lessens the certainty of identification to species, especially those in eastern Oregon.