When it finally freezes good a couple days in a row the food plots willbe more beneficial. I had spread some corn in my food plot two weeks ago and when I went by there today it was still out there. Nothing, including the cows are hitting the food plot due to so much green out there. I put another strong of electric fence on the food plot to help keep the baby cows out. It is green and good looking, but deer aren't there right now, at least not when I am there.
Give it time, it will be worth your time and effort. Just give it time.