From the foothills of Boulder to the suburbs of Arapahoe County, these sightings have triggered official warnings for pet owners and parents to remain vigilant during the shorter winter days.
1. The Brazen Behavior
In recent months, homeowners in several counties have captured chilling footage on security cameras. In one instance in La Plata County, a group of mountain lions was filmed “scoping out” a backyard for several minutes, staring directly into windows and showing no fear of human proximity.
More recently, in December 2025, officials in Boulder and Arapahoe County reported a particularly brazen lion lounging on property walls and wandering…..