This is the absolute best place in Colorado to see the aspen trees changing colors from green to yellow in the first few weeks of Fall. There is an abundance of aspen along the drive, and many stopping points where you can safely park your car to snap some photos. I should also mention there are a few unsafe parking spots on the pass! The best views are between Aspen and Weller Campground. Best time of day to go is between 2pm and sunset for photos. Semi trucks are not allowed on this pass. Use extra precaution when driving an RV: very steep, narrow lanes, and low clearance rock overhangs.