I am in IL not far from St. Louis area and I had some does come running to the the can this weekend.. I used it three times in a rowand had does running right at me after a few minutes.. Dumb Luck?? I dunno, but I stuck one anyway.

Oh, and I heard a buck and doe making faint grunting sounds this weekend also, used my grunt very softly and had them come right in.. Stuck that one also.. lol

Two deer this weekend and I used the calls. I wouldn't say it too early but you can't use them very aggressive.