Based on 9,263 research-grade iNaturalist observations in Colorado, Mallard is most often recorded in April; in Colorado it behaves like a year-round resident. It ranks #3 among birds recorded in the state in our data.
Anas platyrhynchos
Mallard 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
American Robin
Canada Goose
Red-winged Blackbird
Black-billed Magpie
Red-tailed Hawk
Great Blue Heron
American White Pelican
Western Meadowlark
Places to look in Colorado
National ForestWhite River National Forest
Botanical GardenDenver Botanic Gardens
National ForestRio Grande National Forest
National ForestSan Juan National Forest
State ParkRoxborough State Park
State ParkMancos State Park
FAQ
When does Mallard appear in Colorado?
Mainly March–October, with the most records in April.
How common is Mallard in Colorado?
It ranks #3 by number of iNaturalist observations among birds in Colorado (9,263 records in our sample).