Based on 6,504 research-grade iNaturalist observations in Colorado, Yellow-bellied Marmot is most often recorded in July; in Colorado it behaves like a summer visitor / breeder. It ranks #6 among mammals recorded in the state in our data.
Marmota flaviventris
Yellow-bellied Marmot 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 July
Mule Deer
Common Golden-mantled Ground Squirrel
Moose
Wapiti
American Pika
Black-tailed Prairie Dog
Bighorn Sheep
Mountain Goat
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 Yellow-bellied Marmot appear in Colorado?
Mainly June–August, with the most records in July.
How common is Yellow-bellied Marmot in Colorado?
It ranks #6 by number of iNaturalist observations among mammals in Colorado (6,504 records in our sample).