• 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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  • Impacts from September 2013 Flood - Old Fall River Road, Alluvial Fan and Trails

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Cumulus Clouds

a photo of cumulus clouds
Cumulus clouds result from unstable rising air masses.
Photo courtesy of Rocky Mountain National Park.

Did You Know?

Ptarmigan in summer camouflage

The ptarmigan is camouflaged perfectly in summer, with "mottled rock" color, and in winter, when it takes on the color of snow.