Colorado’s aspen leaves turn buttery-yellow every fall. ... while anthocyanins—which result from sugar getting trapped in the leaves—contribute red, blue and purple hues.

WASHINGTON — The U.S. Postal Service launched its Vibrant Leaves postcard stamps on March 17, 2025, celebrating the vivid hues of fall foliage. The set of five stamps features individual leaves ...

This map can tell you when fall foliage is peaking in 2022 Aspen, ... This animated map shows fall leaf color projections from SmokyMountains.com. ... that brings striking red and purple colors.

Aspen leaf pigmentation can be influenced by temperature and exposure to sunlight, with West adding that cooler temperatures can lead to darker colors. While it’s fine for temperatures to teeter above ...

Aspen tree. As the weather cools down, ... In the summertime, the Canada Red displays a vibrant green, until the weather cools, turning its leaves to a beautiful reddish-purple. 6.

Fall leaves in Smith Lake at Washington Park on Oct. 21, 2019 in Denver. (Photo by RJ Sangosti/The Denver Post) Look beyond Colorado’s shimmering yellow aspen trees for wonderful leaf-peeping ...

An aspen leaf hangs from a tree as the bright yellow landscape of Rabbit Ears Pass fills the background on Oct. 2, 2023. John F. Russell/Steamboat Pilot & Today Light hits Peak 8 in Breckenridge as ...