Dying, Off, Color Pine Needles Normal in Autumn, Colorado State Forest Service

Ponderosa and lodgepole pines and some spruce and fir species Colorado shed older, interior needles as part of an annual growth cycle in September and October.

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Colorado State Forest Service says off-color pine needles normal, not disease

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Forest Health Issues in Northwest Colorado, Colorado State Forest Service

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Dying, Off-Color Pine Needles Normal In Autumn, Estes Valley Spotlight

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Ponderosa Pines, Spruce May Exhibit 'Winter Burn' Damage, Colorado State Forest Service

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JeffCo Master Gardeners: Ponderosa pines, spruce may exhibit 'winter burn' by Colorado State Forest Service