• Photo of park visitors enjoying sunset from the Alpine Ridge Trail in Rocky Mountain National Park.

    Rocky Mountain

    National Park Colorado

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Fall Leaves

a photo of fall leaves
Aspen leaves turn golden in the fall due to their carotene accessory pigments while Fremont geranium (Geranium caespitosum) leaves have turned red because of their anthocyanin accessory pigments.
Photo courtesy of Rocky Mountain National Park.


  

Did You Know?

a photo of a Rocky Mountain Parnassian butterfly

This Rocky Mountain Parnassian butterfly is a strong flier, even on the windy alpine tundra at 12,000 feet. More...