While walking around I noticed that the leaves of the Quaking Aspens were turning color. Generally, they seem to change to yellow, but some of those I saw were going orange and red. It got me curious and I found this explanation from the USDA Rocky Mountain Region: “In some trees, as the sugar concentration in the leaf increases, the sugar reacts to form anthocyanins. These pigments cause the yellowing leaves to turn red.” Here is a photo of one of the Aspens.