Autumn in Vermont is hard to beat. Fall foliage, brewfests and flannels make for the quintessential New England experience. Many of Vermont's ski areas will be hosting brewfests and Octoberfests as well as providing scenic chairlift rides for leaf peeping.
In Colorado, the most definitive way to know that summer is over and winter is not long off comes when the high-country aspen groves put on their brilliant yellow coats.
As autumn arrives, the Northern Hemisphere tilts farther and farther away from the sun – a shortening of the day's light that curbs photosynthesis and produces the brilliant yellows and reds of aspen trees in the Mountain West.