As late summer transitions to autumn, North Carolina is gearing up for one of the most spectacular displays of natural beauty in the country. But when will the leaves peak, and how vibrant will the colors be? While many factors play a role, decades of data reveal that our fall foliage timing boils down to a few key variables — most notably, the weather in September.
Here is a look at the science behind this year’s foliage forecast and what we are tracking as we head deeper into autumn.
September: the ultimate determinant
While we often look at summer temperatures and spring rainfall, historical data gathered from the Boone weather station by Dr. Howie Neufeld, retired professor from Appalachian State University, shows that September average (“mean”) daily temperatures are the true determinant for leaf color timing at middle elevations (2,500 to 4,000 feet).
Neufeld suggests the relationship is remarkably precise: “For every degree increase in the mean September temperature, fall leaf colors are delayed by approximately two days. When September averages are unusually warm — as we saw in 2018 and 2019 — the peak color can be delayed by as much as two weeks.”
Interestingly, while high mean temperatures delay the colors, extremely high maximum (daytime) temperatures in August or September actually have the opposite effect, causing leaves to turn sooner. This is likely a hidden “drought” signal, as heat-stressed trees begin shutting down early. Clouds and improved summer rainfall have kept a lid on late-season hot weather in the High Country.
The data behind NC’s peak fall color
The recipe for brilliant reds
What makes a “good” fall color year? For most people, it comes down to the brilliance of the reds.
While yellows and oranges remain relatively consistent from year to year, red pigments known as anthocyanins are highly variable. Anthocyanins are stimulated by a specific weather pattern: abundant late-summer sunshine paired with a rapid drop in temperature.
Sunny days allow trees to produce sugars through photosynthesis. When nighttime temperatures drop sharply into the 30s and 40s, those sugars get trapped in the leaves, triggering intense red pigment production.
2026 outlook and progression
This year, according to Evan Fisher, owner and founder of Explore Fall in Asheville, above-normal spring and summer temperatures, combined with ongoing — but easing — drought conditions, has him believing there will be a slightly earlier than normal start of the season.
All data considered, a classic downslope fall color progression can be expected:
With a rolling peak that spans up to eight weeks, North Carolina is poised to deliver the longest and possibly the most spectacular foliage season in the nation.
- Late September: Peak colors begin at high elevations (above 4,000 feet, including Mt. Mitchell and Craggy Gardens).
- Oct. 10–20: Peak color reaches middle elevations (2,500 to 4,000 feet, including Boone and Asheville).
- Late October: Lower elevations in the foothills (below 2,500 feet) peak.
- November to Thanksgiving: Color moves through the Piedmont and finally reaches the coast.
With a rolling peak that spans up to eight weeks, North Carolina is poised to deliver the longest and possibly the most spectacular foliage season in the nation.
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