Based on 2,866 research-grade iNaturalist observations in Oregon, Common Merganser is most often recorded in January; in Oregon it behaves like a year-round resident. It ranks #41 among birds recorded in the state in our data.
Mergus merganser
Common Merganser in Oregon by month
Bars show research-grade observations per month. They mix true seasonality with how often people are outdoors, so treat small numbers with caution.
Also seen in Oregon in January
Dark-eyed Junco
Bald Eagle
Song Sparrow
Red-tailed Hawk
Great Blue Heron
Golden-crowned Sparrow
Mallard
American Robin
Places to look in Oregon
National ForestWillamette National Forest
National ForestMount Hood National Forest
National ForestDeschutes National Forest
Botanical GardenHoyt Arboretum
Botanical GardenLeach Botanical Garden
National ForestUmatilla National Forest
FAQ
When does Common Merganser appear in Oregon?
Mainly December–November, with the most records in January.
How common is Common Merganser in Oregon?
It ranks #41 by number of iNaturalist observations among birds in Oregon (2,866 records in our sample).