• 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 the mountains at treeline

Temperature causes tree line. Trees need an average growing temperature of about 50 degrees fahrenheit.