Based on 10,237 research-grade iNaturalist observations in Colorado, Black-billed Magpie is most often recorded in June; in Colorado it behaves like a year-round resident. It ranks #1 among birds recorded in the state in our data.
Pica hudsonia
Black-billed Magpie in Colorado 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 Colorado in June

American Robin
Red-winged Blackbird

Broad-tailed Hummingbird

Mallard

Spotted Towhee

Great Blue Heron

Red-tailed Hawk
Canada Goose
Places to look in Colorado
White River National Forest
Denver Botanic Gardens
Rio Grande National Forest
National ForestSan Juan National Forest
Roxborough State Park
Mancos State Park
FAQ
When does Black-billed Magpie appear in Colorado?
Mainly March–January, with the most records in June.
How common is Black-billed Magpie in Colorado?
It ranks #1 by number of iNaturalist observations among birds in Colorado (10,237 records in our sample).