![](https://csfs.colostate.edu/wp-content/uploads/2015/09/fall-needlecast-ponderosapine-Sep2013-RLockwood.jpg)
Yellowing Pine Needles Normal in Autumn
FORT COLLINS, Colo. – Although thousands of evergreen trees in areas of Colorado are beginning to display dying yellow or brown needles, most are simply going through a natural shedding process – and are not infested by bark beetles or tree disease.