Colorado State Forest Service

The mission of the Colorado State Forest Service is to achieve stewardship of Colorado's diverse forest environments for the benefit of present and future generations.

Yellow Pine Needles Normal in Autumn

Seasonal discoloration and loss of pine needles on a ponderosa pine.
Seasonal discoloration and loss of pine needles on a ponderosa pine.

Although thousands of evergreen trees throughout Colorado are beginning to display dying yellow, red or brown needles, most are simply going through a natural shedding process – and are not infested by bark beetles or tree disease.

This needle cast, or shedding, usually starts in late summer and early fall with the change in seasons and weather. Needles will continue to be shed throughout the fall and into winter, usually aided by frosts and wind events. Read more

Transporting Firewood Can Spread Tree-Killing Insects

Emerald ash borer (larva shown here) is an invasive insect that was first detected in Colorado last fall.
Emerald ash borer (larva shown here) is an invasive insect that was first detected in Colorado last fall.

Firewood is on the minds of many Coloradans as fall approaches, with some stocking up on cords for winter fuel while others plan on procuring a few armloads for hunting trips.

But because of the considerable impact emerald ash borer (EAB), native bark beetles and other insects can have on Colorado forests, the Colorado State Forest Service wants to be sure people are aware of the risks associated with transporting firewood. Read more