I am going to tell you the same thing I tell almost every beginner here-learn to use Internet search engines such as Yahoo and Google to find this kind of information. It isn't rocket science, but if you don't learn, you are missing out on finding a whole lot of useful information.
Don't expect the members here to have been where you are going or have been there at the same time of year. If someone has, it is just pure luck in many cases unless the place is really well known.
I found the website for the Wisconson DNR in about a minute using "kettle moraine" as the search term on Yahoo.
Start here- Wisconsin DNR