Rockford Country Club is an 18-hole private golf course in Rockford, Illinois, built in 1899 and designed by H. J. Tweedie. It sits in the $$$ (premium) price range for golf in Illinois. The season runs Mar 1 to Nov 1 (closed on Mondays). Play is generally limited to members and their guests.
Details like fees and seasons change, so call the course before you head out.