Based on 2,440 research-grade iNaturalist observations in Oregon, Ring-necked Duck is most often recorded in March; in Oregon it behaves like a winter visitor. It ranks #56 among birds recorded in the state in our data.
Aythya collaris
Ring-necked Duck 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 March

Mallard

American Robin
Canada Goose

Dark-eyed Junco

Song Sparrow

Bald Eagle
Anna's Hummingbird

Spotted Towhee
Places to look in Oregon
National ForestWillamette National Forest
Mount Hood National Forest
National ForestDeschutes National Forest
Hoyt Arboretum
Leach Botanical Garden
Umatilla National Forest
FAQ
When does Ring-necked Duck appear in Oregon?
Mainly October–April, with the most records in March.
How common is Ring-necked Duck in Oregon?
It ranks #56 by number of iNaturalist observations among birds in Oregon (2,440 records in our sample).