Michigan could reach 70% vaccine coverage by August, UMich tool shows By Jack Nissen ANN ARBOR, Mich. - If Michigan managed to administer 202,000 adults their first vaccine shot per week, the state would reach its 70% coverage goal by July. At Michigan's current rate, it may take until mid-August or even later to reach its vaccine goal (School of Public Health at the University of Michigan) That's the average number of 1st doses that have been handed out since vaccines became available. But at its current rate, it may take until mid-August or even later for the state to reach its goal and fourth vaccine milestone when it said it would lift its mask mandate.