We start feeding creep about the 15th of June (Calving 90% mid to late march). What we usually do is buy 100lbs of 18% feed to get them started and them go to a 16% until about a month before wean, after that we feed a 12% ration. Most other people around me feed what I call a day-one creep, which is the calves are on creep the day they decide to start eating creep. I don't feel this is cost effective for me. The general commercial consensus is to start feeding about a month before wean, but this doesn't usually work for clubby producer, cause the calves don't get that cover to them that is needed to make them appear more saleable.