Aspen is the most widely distributed tree species in North America, the first and most beautiful in early autumn exhibition. Aspen is the West's major contribution to fall leaf viewing.
Ranging from Alaska to Newfoundland and down the Rocky Mountains to Mexico, the States of Utah and Colorado are home to the largest portion of the natural acreage of aspen in the World. Here is the aspen range in North America.
Aspen unfolds it's finest fall color show west of the Mississippi River. As an aspen leaf's chlorophyll fades, a group of colored pigments called carotenoids show. Like chlorophyll, carotenoids are contained in the plastids, tiny structures in leaf cells. Carotenoids are the yellow we see each fall in aspens.