The Science Behind the Color The vivid hues of autumn are not new colors appearing in the leaves, but rather the revelation of pigments that were present all summer long. This is the work of anthocyanins, pigments that trees synthesize in the fall.
How Anthocyanins Drive Colorado's Fall Foliage Science
Regional Variations Across the State. A late spring frost, a particularly hot or dry summer, or an early cold snap can all compress the timeline or dull the vibrancy of the display.
A wet and warm summer generally promotes healthy leaves capable of producing the most brilliant anthocyanins, leading to a more spectacular show. Tracking the Progress Because the event is so dependent on weather, resource managers and enthusiasts rely on phenology—the study of natural cycles—to track progress rather than a fixed calendar date.
How Anthocyanins Drive Colorado's Fall Foliage Science
The formation of these compounds is influenced by bright sunny days, cool (but not freezing) nights, and ample moisture, creating the most intense displays of crimson and scarlet seen in species like maples and aspens. Chlorophyll, the green pigment essential for photosynthesis, dominates the leaf during the growing season, masking other colors.
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