Colorado weather in the fall is usually beautiful, but you must be prepared for all types of weather including rain and snow. Dress in layers and bring good hiking boots. Mueller State Park is home to abundant wildlife including deer, elk, bear, big horn sheep and the occasional mountain lion so make sure you bring your telephoto lens beside your usual landscape equipment.
I almost did not go out on this day as the weather was pretty dismal. When I got to the park, the rain subsided and it began misting and a fog rolled in. This photo was taken in mid September just as the aspens were beginning to turn.