XsXm008 - I've never found any in the Cook County area, but have been more successful in other parts of the state. If you check out other Illinois message boards, you should get a good idea what to look for. Keep an eye on the southern part of the state, and expect the Chicagoland area to be two-three weeks behind them. You also have to consider the possible effect of road salt (which kills fungi mycelium) in areas where you look. When conditions are right, I would expect black and grays first, maybe around April 18, followed by yellers a week or so later. I will be looking in local forest preserves myself - purely for observatory reasons, of course, not to pick - but am expecting to find better results in more distant locations. Good Luck !