Based on 1,731 research-grade iNaturalist observations in Wyoming, Black-billed Magpie is most often recorded in June; in Wyoming it behaves like a summer visitor / breeder. It ranks #3 among birds recorded in the state in our data.
Pica hudsonia
Black-billed Magpie in Wyoming 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 Wyoming in June

Common Raven

Mountain Bluebird

American Robin

Killdeer
Canada Goose

Brown-headed Cowbird

Western Tanager

Barrow's Goldeneye
Places to look in Wyoming
National ForestShoshone National Forest
National ForestBridger–Teton National Forest
Fort Bridger
Hot Springs State Park
Fort Fred Steele State Historic Site
National Wildlife RefugeNational Elk Refuge
FAQ
When does Black-billed Magpie appear in Wyoming?
Mainly May–October, with the most records in June.
How common is Black-billed Magpie in Wyoming?
It ranks #3 by number of iNaturalist observations among birds in Wyoming (1,731 records in our sample).