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I think it was somewhere around 94 or so, when we were on the ice the weekend before trout season, April 7thish..........Who knows for this year, mid march? late march? Once the days get longer and it warms up just a bit, it only takes a couple days of warm temps/rain to mess up the ice. All this snow on the ground will not help either, as rain will quickly melt it and flood little creeks, which in turn will raise water levels in the lakes, flooding and breaking up the ice.
Remember yrs ago here in lower Michigan, fished till April 5th, there were guys that was out on the 8th, but not me!! I think that year I measured 28-30" ice