![](https://csfs.colostate.edu/wp-content/uploads/2017/09/fall-needlecast.jpg)
Dying, Off-Color Pine Needles Normal in Autumn
FORT COLLINS, Colo. — Although thousands of evergreen trees in Colorado’s high country, foothills and communities are beginning to display dying yellow or brown needles, most are simply going through a natural shedding process — and are not being damaged by bark beetles or any specific tree insect or disease.