This autumn, Ann Arbor’s trees are slowly showing their vibrant reds, oranges, and yellows. However, many are just beginning this transition, which is quite late compared to Michigan’s usual peak in mid-September to October. Experts suggest that this delay might be linked to climate change. As global warming continues, we may face similar late starts in future years.
This year, many trees across Michigan display muted colors—less vibrant than in previous seasons. A nationwide drought is partly to blame, affecting both the Northeast and Western U.S. In some cases, leaves are turning from green straight to brown, skipping the bright colors altogether.
Inés Ibáñez, a professor in environment and sustainability, explains that shorter days and cooler fall temperatures cue trees to produce less chlorophyll, which leads to different colors. “If broadleaf trees keep their leaves too long, they will freeze,” she noted. This natural process is driven by the length of daylight and temperature changes.
Kai Zhu, another professor in the field, adds that moisture levels are also significant. Michigan has seen less precipitation and warmer temperatures recently, which directly affects the vibrancy and duration of fall colors. “Warmer temperatures delay color changes and can shorten the fall season,” he stated.
Climate change is playing a significant role here. Extremes in weather now seem more common, impacting how and when leaves change color. Research shows that the timing of peak foliage has shifted by one to two weeks over the past few decades—an important change for both nature and tourism.
Ibáñez mentions that climate change affects trees beyond fall; it also disrupts spring growth. For instance, in 2012, unusually warm weather caused fruit trees to bloom early, only to be devastated by a late frost, which ruined that year’s apple crop. This incident highlights the economic implications of climate change on agriculture.
Tourism can also feel the effects of dull fall colors. Zhu points out that many people travel to enjoy the beauty of autumn leaves. A lack of vivid colors can therefore impact local economies that rely on visitors. Additionally, when tree health declines, their ability to absorb carbon dioxide decreases, affecting air quality and ecosystem health.
Freshman Joseph Stout, who hails from Michigan, believes the subdued colors serve as a reminder of the environment’s fragility. He feels a strong need to protect these natural displays, especially during fall hikes in Ann Arbor. “Our environment is beautiful, and we should work to preserve it,” he reflected.
As we celebrate beautiful fall days, let’s also think about how to care for the environment. It’s not just about enjoying the scenery; it’s about ensuring future generations can enjoy it, too.
