Fall has officially begun, and the season for watching the changing colors of the leaves has arrived. Millions across the United States are planning trips to various regions to see the vibrant autumn colors, which translate into billions of dollars in tourism revenue for cities and areas. An estimate from the National Park Service indicates that fall tourists spend over $8 billion annually in the New England region.
Challenges in Predicting Leaf Color Change
Determining the best time and place to view autumn colors has become more challenging than ever. Experts believe that predicting the peak leaf color change has become more complex due to climate change. William Keeton, a professor of forest ecology and forestry at the University of Vermont, says, "There are many factors that affect the different colors in the landscape, and all of these factors can interact in unpredictable ways."
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Impact of Climate Change
Across the United States, autumn colors appear in various forms, with leaves changing against backgrounds ranging from mountain peaks to colorful farmlands. According to weather forecasts, New England and upstate New York are among the promising areas for viewing vibrant autumn colors. However, predictions indicate that fewer colors will be observed in parts of the lower Mississippi Valley and the Southeast.
Weather conditions such as rainfall and temperature can affect the timing and intensity of autumn colors. The years 2015 to 2025 have been the warmest on record, and this heat impacts the trees. Keeton states, "Heat, especially including high nighttime temperatures, can delay the timing of leaf color change."
Severe weather events such as drought and heavy rainfall can also affect the intensity of colors. Keeton adds, "Drought can reduce the production of the chemical compounds that create autumn color and can also stress trees, leading to early leaf drop."
Ultimately, predicting the exact timing of peak leaf color change becomes more difficult each year. Stephanie Spradlin, a professor of geography and environmental studies at the University of Richmond, says, "You have to pick a weekend and hope it’s the right time."
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