Of several swans found in Oregon, the tundra swan is by far the most common during the non-breeding season. It is most readily distinguished from the similar-appearing trumpeter swan by voice, although subtle differences in physical appearance and behavior can separate the two with difficulty.
It is a fairly common transient throughout the state but most abundant at large bodies of water and wetland complexes east of the Cascades including the Malheur National Wildlife Refuge and the surrounding Harney Basin, Summer Lake Wildlife Area and the Klamath Basin.