Iowa Fall Color Report
The Iowa DNR reported on Monday, September 30:
Elm, walnut, ash, birch, and cottonwood are changing to yellow. White ash are turning purple gradually. Sumac are getting red along roadsides and Virginia creeper vines are becoming a pretty red. Excessive rain and humidity this growing season have caused leaf diseases on many trees which will likely subdue some color.
You can also utilize this fall foliage map.