Samant Kumar of Bihar scored the all important goal at the 78th minute when he received a cross from the left flank during a counter attack and converted it, sealing the fate of Jharkhand.
Earlier, the first half saw a keen contest as neither of the sides allow the other to take upper hand though both sides made a couple of moves but missed the target at the Gopal Maidan encounter.
Jharkhand mounted pressure and dominated the mid-field after the breather but could not convert the opportunities that came their way.
Bihar then regrouped and raided continuously at the hosts citadel. Jharkhand, however, was awarded a spot kick against the run of the game when a foul was committed by a Bihar defender in the penalty box.
Bihar goalkeeper Amit Banik, who was exceptionally good under the bar throughout the proceedings, saved the penalty brilliantly.