<P> Two states, Texas and Massachusetts, use NCAA playing rules except as shown below . </P> <P> With their common ancestry, the NFHS rules of high school football are largely similar to the college game, though with some important differences: </P> <Ul> <Li> The four quarters are each 12 minutes in length, as opposed to 15 minutes in college and professional football . (Texas uses the NFHS 12 - minute quarter; Massachusetts uses 11 - minute quarters except in playoffs, where they are 10 minutes because of the possibility of playing three games in 10 days .) </Li> <Li> Kickoffs take place at the kicking team's 40 - yard line, as opposed to the 35 in college and the NFL . (Both Texas and Massachusetts have adopted the NFHS rule .) </Li> <Li> If an attempted field goal is missed it is treated as a punt, normally it would be a touchback and the opposing team will start at the 20 - yard line . However, if it does not enter the end zone, it can be downed or returned as a normal punt . </Li> <Li> Any kick crossing the goal line is automatically a touchback; kicks cannot be returned out of the end zone . </Li> <Li> Pass interference by the defense results in a 15 - yard penalty, but no automatic first down . </Li> <Li> Pass interference by the offense results in a 15 - yard penalty, from the previous spot, and no loss of down . </Li> <Li> The defense cannot return an extra-point attempt for a score . </Li> <Li> Any defensive player that encroaches the neutral zone, regardless of whether the ball was snapped or not, commits a "dead ball" foul for encroachment. 5 - yard penalty from the previous spot . </Li> <Li> Prior to 2013, offensive pass interference resulted in a 15 - yard penalty AND a loss of down . The loss of down provision has been deleted from the rules starting in 2013 . In college and the NFL, offensive pass interference is only 10 yards . </Li> <Li> The use of overtime, and the type of overtime used, is up to the individual state association . The NFHS offers a suggested overtime procedure based on the Kansas Playoff, but does not make its provisions mandatory . </Li> <Li> Intentional grounding may be called even if the quarterback is outside the tackle box . </Li> <Li> The home team must wear dark - colored jerseys, and the visiting team must wear white jerseys . In the NFL, the home team has choice of jersey color, and in the NCAA, the home team may wear white with approval of the visiting team . </Li> </Ul> <Li> The four quarters are each 12 minutes in length, as opposed to 15 minutes in college and professional football . (Texas uses the NFHS 12 - minute quarter; Massachusetts uses 11 - minute quarters except in playoffs, where they are 10 minutes because of the possibility of playing three games in 10 days .) </Li>

How long is a normal high school football game
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