Finding ski resorts in Chicago is easy especially considering the high number of internet resources to assist in that. There are several websites that can guide you in this, together with the usual guides used in any travel experience which include the yellow pages, travel wizard and the hotels directory since most almost these entire ski resorts are integrated with hotel establishments.
Some of these sites are detailed in such a way that you cannot encounter any problem while searching or booking, which you can do online anyway.
http://www.yellowpages.com/Chicago-IL/Ski-Centers-Resorts?from=qpiCityState
The top-most ski resort in Chicago is the Vail Co skiing resort which has a Chicago hotel tagged besides it for accommodation and other services which are usually gotten from hotels.
There is also the Norge Ski Club along 100 Ski Hill Road in Fox River grove. You can mention Raging Buffalo snowboard Park and the Ski Entertainment, which are other two important destinations for lovers of skiing in Chicago.
Among the top five we still have Chicago Metropolitan Ski, which is basically a combination of a ski resort, hotels with a restaurant and community organization.
http://chicago.citysearch.com/listings/chicago-il-metro/ski_resorts/82078_4309?publisher=smx_noncust&reference_id=1&placement=search-grid
http://www.onthesnow.com/chicago/skireport.html