Check with the bait shops as suggested, we have had snow the past 2 nights, about 40 min south of Cadillac, which has put anywhere from 4-6 in of insulation on top of the ice and temps are in the high teens and low 20's over night with snow cover will make ice production slow down. My pond, 12ft deep, has ice and is holding snow now but I would not walk on it and wont let the dogs get near it yet.