Based on 3,634 research-grade iNaturalist observations in Colorado, American White Pelican is most often recorded in April; in Colorado it behaves like a seasonal. It ranks #17 among birds recorded in the state in our data.
Pelecanus erythrorhynchos
American White Pelican 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 April

Mallard

American Robin
Canada Goose
Red-winged Blackbird
Black-billed Magpie

Red-tailed Hawk

Great Blue Heron

Western Meadowlark
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 American White Pelican appear in Colorado?
Mainly April–August, with the most records in April.
How common is American White Pelican in Colorado?
It ranks #17 by number of iNaturalist observations among birds in Colorado (3,634 records in our sample).