Based on 6,563 research-grade iNaturalist observations in Oregon, Anna's Hummingbird is most often recorded in March; in Oregon it behaves like a year-round resident. It ranks #11 among birds recorded in the state in our data.
Calypte anna
Anna's Hummingbird 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

Spotted Towhee

Great Blue Heron
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 Anna's Hummingbird appear in Oregon?
Mainly February–January, with the most records in March.
How common is Anna's Hummingbird in Oregon?
It ranks #11 by number of iNaturalist observations among birds in Oregon (6,563 records in our sample).