They also have the southeast but there's not much to report there yet. In the Northeast elevation is a huge factor whereas in the flatter Midwest it's more about how far north you are - though maybe elevation accounts for the western slant of the moderate-high areas.
If you're going to Wisconsin, the state's tourism department has a nice interactive map where you can mouse over a county and get "color meter" scores from specific areas within.
Finally, I couldn't resist making an animation from the northeast reports to show the spread of color. Happy leaf travels!