Will dry weather delay peak fall colors in Kentucky? When to see the best leaves
AI-generated summary reviewed by our newsroom.
- Dry summer conditions in Kentucky could delay and dull 2025 fall foliage display.
- Moisture, temperature, and daylight length jointly drive fall color vibrancy.
- One outlook shows fall colors peaking in Kentucky in mid to late October.
It might feel like autumn temperatures have arrived in Kentucky and that brilliant foliage can’t be far behind, but dry conditions across most of the state could put a damper on fall fantasies.
Most of the state is experiencing either abnormally dry conditions or moderate drought, according to the U.S. Drought Monitor, using the latest data of Sept. 2.
A lack of rain can delay the arrival of fall colors for weeks and make them more muted when they do appear. So if you’re planning a fall drive or photo shoot, here’s what to know to get the timing right.
Why do the leaves change color in the fall?
As explained by the U.S. Forest Service, three main factors trigger the fiery fall colors we see each year. All three have to come together in the right combination to produce the most brilliant hues.
They include:
- Shorter days, longer nights: This is the most influential factor. While temperature, rainfall and food supply play important roles in autumnal transformation, the shorter days and longer nights that come with the changing seasons influence the tree’s biological clock. It serves as a signal for the tree to begin preparing for winter dormancy and kicks off the biochemical processes that accompany that change. Trees store sugar to survive the winter. With the arrival of longer, cooler nights, trees gradually cut off sugar supply to their leaves with a layer of cells that forms at the base of each leaf. Once the leaf is sealed off from the rest of the tree, it’s ready to fall.
- Weather conditions: Temperature and moisture in particular are most influential in determining the variety and brilliance of fall colors. They play the greatest role just before and as chlorophyll is dwindling within the tree’s leaves. Drought during the year can delay the arrival of fall colors by weeks, and excessively warm weather during the fall will also dial back the autumn palette. Ideally, for the most vibrant colors, the tree wants to strike the right balance free of extremes between spring, summer and fall. This means a warm, wet spring, drought-free summer and an autumn defined by warm, sunny days and cool nights.
- Leaf pigments: The timing and variety of certain fall colors varies between species, but there are three basic pigment types involved in the process. They are chlorophyll (green), carotenoids (yellow and orange) and anthocyanins (red and purple). Chlorophyll enables photosynthesis, but as the days shorten, its production slows down.
Will Kentucky see brilliant fall colors in 2025?
As mentioned, temperature and moisture play the greatest role in the breadth and brilliance of the fall colors we see each year.
Looking at moisture, almost all of Kentucky is experiencing abnormally dry or moderate drought conditions. That includes Fayette County, which is seeing abnormally dry, but not full-blown drought conditions. Under moderate drought conditions, trees begin to show signs of mild stress.
The situation may not improve much, given outlooks from the nation’s Climate Prediction Center show Kentucky is leaning toward a warmer-than-average autumn.
That lack of moisture could play a role in delaying the arrival of fall colors in Kentucky this year and making them more muted.
As explained by Chase Graham, a meteorologist with the National Weather Service’s Louisville office, Kentucky didn’t see an exceptionally warm summer compared to historical records, but the diminished rainfall is notable, even in spite of the Lexington’s fifth rainiest spring. Some parts of the state saw about half as much rain as they usually do in the summer.
“Almost all of the state was at or below normal precipitation for the summer,” Graham told the Herald-Leader in an interview Sept. 5. “After the wet spring that we had, we have had a pretty dry summer across the entirety of the state.”
What is the best week to see fall colors in Kentucky?
The answer varies depending on where you are in the Bluegrass State, as elevation is also a factor in the emergence of fall colors. The shift begins in the Appalachian Mountains of Eastern Kentucky and gradually rolls across the state.
The 2025 Smoky Mountains outlook shows that fall colors won’t be noticeable across most of the state until the first week of October. They reach their peak or near-peak during the last two weeks of the month.