So it’s late September and the official first day of autumn is recently passed. Fall colors are popping up throughout the Yellowstone region and will work their way down to lower elevations over the coming weeks. Right now so areas of aspens are in peak color while others are still green. A big shift in autumn color should take place in the next week especially as the weather has turned cooler and more fall-like. This image was taken a few days ago and shows a stand of aspens nearing peak color while the surrounding willows are were very close to peak. Typically aspens turn first followed shortly after by the cottonwoods, which are the two primary sources of deciduous forest in the area.