The Sawatch Range is awash in gold as aspens change near the Monarch Lime Quarry on U.S. 50. Leaf peepers have about a week left to get the best views of the high country aspens at their peak. Right: golden aspen glow in the sunshine near Monarch Lime Quarry on U.S. 50. The autumn display is an attraction for photographers and other leaf peepers in the high country. Colorado Department of Transportation advises pulling completely off the road and setting hazard lights before getting out to take photos.