In Jo Daviess, Lee, Ogle, Whiteside, Carroll, and Stephenson Counties, peak fall color happened during last two weeks. Native species are no longer showing much green. Some species are losing or have dropped their leaves. Primary colors are orange, red, and auburn yellow.
In the Quad Cities region, the oaks have suddenly turned, with black and bur oak generally brownish yellow to beige; white oak are brownish yellow to rust to a reddish pink color; red oak vary from yellow brown to maroon, pin oak vary from yellowish brown to bronze; white ash and red maple are still holding on to pinkish purple and faint scarlet, respectively; sugar maple are mainly yellow and yellowish orange; hickories are brownish yellow to brown. Some trees are still light green. Burning bushes are, for the most part, brilliant scarlet, especially in full sun.
West Central Illinois
In Pike, Adams, Brown, Scott, Calhoun, Jersey, Macoupin, and Greene Counties, nearly all tree species are taking on full fall colors, with only a few stubborn oak, hickory, and pecan trees remaining entirely green. With strong weekend winds, trees in Adams County, Brown County, and northern Pike and Scott Counties were steadily losing leaves. Peak fall colors in most areas of these counties will be through this weekend. After this weekend, fall colors will likely diminish a great deal in most areas.
Nearly the entirety of Calhoun County has exceptional colors right now. Great fall color drives this weekend would be from Alton to Grafton along the Great River Road (Route 100).
The fall colors in the Jersey County area have finally begun to develop. The area along the Great Road from Alton to Bluffs including Pere Marquette State Park will peak through early next week. Maples are getting very good yellows, reds and oranges. The oaks still have good amounts of green leaves, but the reds and oranges are coming along. The dogwoods, sassafras and sumacs have good reds, yellow and oranges. The area burning bushes have brilliant reds.