Find out before the game starts: 
- if there is going to be an overtime
- if so, one period or multiple periods
- the commissioner and/or the AD is a good source for this information
If the game ends in a tie, do the following:
- Two minute time out for teams to confer with their coaches
- Captains to center of field for toss of coin: a. Winner gets choice of – offense or defense…or which end of field to be used for all overtimes
- Loser gets remaining choice
- Alternating choice of offense or defense for subsequent overtime period(s)…if necessary
Extra points:
- In the overtime, the try may be a pass or run since a two point conversion must be attempted.
- Any team that scores a touchdown must attempt a two point conversion for all tries including the first one
Each team is allowed one full time-out for each overtime period
- No carryovers from 2nd half nor from previous overtime period(s)
NFHS High School Rules- Something to think about…
- Three (3) ful timeouts per half.
- Whatever the goal post are, play the game
- The 40 yard line is the initial kick-off point
- Use of kicking tee is permitted for extra points and field goals
- Football helmets of the same color are not required
Changing the timing of the game…A few thoughts
- Changes before game starts: The length of the quarters of a game and/or intermission may be shortened due to darkness considerations; Let both coaches know; All 4 periods must be of equal length
- Changes during game: Periods may be shortened by agreement of referee and both head coaches. A few situations where this may be necessary: darkness; intermission has been extended beyond your control; game has been halted due to weather or power failure…If changes are to be made, get together with the coaches
MIAA Overtime Rules in Massachusetts