Based on 2,167 research-grade iNaturalist observations in Colorado, Ring-billed Gull is most often recorded in November; in Colorado it behaves like a seasonal. It ranks #43 among birds recorded in the state in our data.
Larus delawarensis
Ring-billed Gull 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 November
Red-tailed Hawk
Canada Goose
Mallard
Black-billed Magpie
American Wigeon
Bald Eagle
Northern Flicker
Dark-eyed Junco
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 Ring-billed Gull appear in Colorado?
Mainly August–April, with the most records in November.
How common is Ring-billed Gull in Colorado?
It ranks #43 by number of iNaturalist observations among birds in Colorado (2,167 records in our sample).