Based on 3,033 research-grade iNaturalist observations in Oregon, Common Golden-mantled Ground Squirrel is most often recorded in August; in Oregon it behaves like a summer visitor / breeder. It ranks #7 among mammals recorded in the state in our data.
Callospermophilus lateralis
Common Golden-mantled Ground Squirrel in Oregon 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 Oregon in August

Mule Deer
Douglas's Squirrel

Townsend's Chipmunk

Douglas's Ground Squirrel
American Pika

North American Porcupine
Coyote

Coypu
Places to look in Oregon
National ForestWillamette National Forest
Mount Hood National Forest
National ForestDeschutes National Forest
Hoyt Arboretum
Leach Botanical Garden
Umatilla National Forest
FAQ
When does Common Golden-mantled Ground Squirrel appear in Oregon?
Mainly June–September, with the most records in August.
How common is Common Golden-mantled Ground Squirrel in Oregon?
It ranks #7 by number of iNaturalist observations among mammals in Oregon (3,033 records in our sample).