Sky Pond, Rocky Mountain National Park, in early September 2006. It was a rather blustery day, which made for cold fingers but also very little traffic on the trail.
Scout Lake, Colorado, early October 2009. Apparently, this is the 5th largest beaver pond in Colorado. As I camped out here the night before, I was awakened every so often by a loud "thwack" of a beaver tail on the water. By morning, the temperature was just 5F and most of the pond had frozen. No more thwacking.
The Snowy Range reflected in Lookout Lake, in southern Wyoming