Delay of Game and the Play Clock
How the 40-second and 25-second play clocks work, what starts and resets them, why delay of game costs five yards, and how timeouts, hard counts and headsets fit in.
The quarterback is walking up to the line with the ball spotted, the defense is shifting, and the numbers on the back-of-the-end-zone clock are falling. Five, four, three. The center puts a hand on the ball, the snap does not come, and a flag lands on the grass. Five yards. Third-and-6 becomes third-and-11, and the offense has just made its own situation harder without a defender touching anyone.
Delay of game is the penalty for failing to start a play in time, and the play clock is the timer that defines "in time." Neither is complicated, but there are enough exceptions, different clock lengths and special cases that even experienced fans get tripped up. This guide explains how the play clock works, what restarts it, what other conduct counts as delay of game, and how teams manage the clock in practice.
Two clocks, two jobs
Football uses two clocks that people often confuse.
The game clock counts down the minutes in each quarter. It stops and starts for a long list of reasons, which we cover in our guide to the game clock.
The play clock is a separate, shorter timer that limits the time between plays. It exists to keep the game moving and to prevent a team from stalling. When the play clock reaches zero before the ball is snapped, the offense has committed a delay of game foul.
The two clocks are independent. The game clock can be stopped while the play clock runs, and the play clock can be running while the game clock is moving too. When people speak about "the clock" in the closing minutes of a game, they usually mean the game clock. When they talk about "getting the snap off," they mean the play clock.
How long is the play clock?
In the NFL and in college football, the play clock has two standard lengths:
- 40 seconds, which starts as soon as the previous play ends.
- 25 seconds, which starts after certain stoppages, once the officials have the ball ready for play.
The 40-second clock is the normal one. Once a play ends and the ball is dead, the clock starts counting down from 40 for the next snap. That gives the offense time to get the play call in, return to the line and change plays if needed.
The 25-second clock is used after an administrative stoppage, which is a stoppage that is not part of the normal flow of the game: a timeout, a change of possession, a penalty, or an injury, among others. After these, officials reset the ball and the play clock starts at 25 once the referee signals the ball is ready for play. The shorter clock acknowledges that the teams already had time to prepare during the stoppage.
The exact list of events that trigger the 25-second clock is in each level's rule book, and it has changed over the years. The right way to think about it is that a team gets the full 40 seconds when the game keeps flowing, and 25 seconds after the game has been stopped for other reasons.
High school
High school football is more varied. The National Federation of State High School Associations publishes the model rules, but state associations decide whether to use a play clock, how long it is, and who operates it. Some states use a 25-second clock, some use 40 seconds, and some games do not have a visible play clock at all and rely on an official to count. If you play or coach in high school, check your state association's rules.
Recreational and youth leagues
Youth and recreational leagues often use a modified clock, or none. A flag football league, for example, may allow a longer window between plays or count out loud. Look at your league's rule sheet in the Play section for guidance on how to organize games.
A play-clock timeline
It helps to picture how the 40 seconds are actually spent. This is a hypothetical NFL offense on a normal first down, using the full clock.
- The previous play ends. The ball is dead, the clock starts at 40, and the offense begins to leave the pile or the sideline.
- The play call arrives. In the first several seconds the play call is relayed in. In the NFL, one player on offense hears it through his helmet radio.
- The huddle or the formation. Players get to their spots, which takes a good part of the remaining time, especially after a long run or a pass that ended deep.
- The quarterback's read. He looks at the defense, may point, change the call or send a player in motion.
- The snap. With a few seconds to spare, the ball is snapped.
Notice how little slack there is when the previous play ended far from the next spot of the ball. The clock does not wait for the officials to chase down a ball or reset the chains, and a team that is late getting off the pile may start the next play with half its time already gone. That is why quick sideline signals, simple play calls and a quarterback who can start the cadence quickly are valuable.
Now compare it with the 25-second version. After a timeout, both teams have already conferred and the players are in place, so the shorter clock rarely causes problems. The risk is more often after a long measurement or an injury, when a team's rhythm has been broken and the call has to be re-sent in a hurry.
Where the play clock is displayed
Play clocks are usually displayed on scoreboards or on separate clock boxes placed around the stadium so that both teams can see them. Officials, not the clock itself, are the ultimate authority. If the display malfunctions, the referee may stop play and reset it. If the clock reaches zero and the official judges that the ball was snapped on time, there is no foul.
The display is for the benefit of players and fans, but the official clock operator controls the timing and the referee decides.
What counts as delay of game
The most common delay of game foul is the simplest: the offense fails to snap the ball before the play clock expires. The penalty is five yards, and the down is replayed from the new spot. That penalty is the same at the NFL, college and high school levels, so the situation can cost an offense a lot of field position without any contact at all.
Other forms of delay of game include:
- Intentionally causing a delay. A player who deliberately holds the ball, throws it away after a play, or otherwise keeps the next snap from happening on time can be flagged, even if the play clock still has time on it.
- Asking for a timeout a team does not have. In the NFL, a team that asks for a timeout when it has none left is flagged for delay of game.
- Delay by the defense. Defenses are not exempt. A defender who deliberately delays the ball being put in play can be penalized for delay as well.
The details differ by level, but the principle is consistent: the rules do not let a team control the pace by stalling.
What happens when a flag is thrown
The penalty is five yards, enforced from the previous spot. If the offense is penalized for delay, the down is replayed with the extra five yards to go. If the defense is penalized, the offense gains five yards and the down is replayed, and if that results in a first down, the offense gets one.
Because delay of game is called before the snap, no play has been run, so there is no result to compare the penalty against. The teams simply line up again from the new spot.
Why teams run out the play clock on purpose
You might wonder why a team would let the clock expire. It sounds absurd, but there are a few strategic reasons.
- Drawing a defense offside. On a short fourth down near the goal line, a team may use a hard count or a pause to try to get the defense to jump. A pause carries the risk that the play clock expires, but the potential payoff of a free five yards (or a free first down) is worth it to some coaches.
- Avoiding something worse. An offense that does not like what it sees and has no timeouts left may decide that five yards is cheaper than running a play into a bad matchup. Coaches rarely plan for this, but it happens.
- Burning time for a decision. A team that is unsure whether to go for it on fourth down sometimes lets the play clock tick down while the head coach finishes his call, then takes a timeout if there is no good option.
Coaches generally try to avoid the penalty unless they have a plan. The cost is real, and in a close game five yards can be the difference between a field goal and a punt.
Timeouts and the play clock
Calling a timeout is the standard way to avoid a delay of game penalty. If a quarterback sees the play clock winding down and the offense is not ready, the quarterback or coach can signal for a timeout, and the officials will stop the clock. Each team has a set number of timeouts per half, and using one for this purpose is a cost the team pays to avoid a five-yard penalty.
How timeouts work, including how many a team has and when it is wise to use one, is covered in our guide to timeouts. A team that has no timeouts left and cannot get the snap off has to choose between the penalty and a rushed play, which is why late in a game you will see offenses sprint to the line.
The headset factor
In the NFL, coaches communicate with one offensive player and one defensive player on the field by radio, built into the helmet. The communication system is cut off when the play clock reaches 15 seconds, or when the ball is snapped, whichever comes first. That means the quarterback and the defensive signal-caller are on their own for the last stretch of the clock, and have to adjust the play without help from the sideline.
This limit shapes the rhythm of an NFL offense. The play call comes in early, and the quarterback has about 15 seconds to read the defense, change the call if needed and get the snap off. If he needs to change the play at the last moment, he does it by signals and calls at the line, not through the radio. Coach-to-player communication in college football has been handled differently from the NFL's system and the rules have been changing, so check the current rules for the conference you follow.
The tempo connection
Offenses that play fast do not need to worry much about the play clock. They snap the ball well before the clock gets low, which wears the defense out and limits its ability to substitute. Slower, more deliberate offenses use most of the clock, burning time off the game clock as well. Our guide to tempo and no-huddle offenses explains how teams use the clock as a weapon.
For the defense, the play clock is an opportunity. A defense that waits until late to disguise its look or shift its formation forces the offense to read the new picture with few seconds left, which increases the chance of a mistake.
How the officials handle the clock
Several members of an officiating crew pay attention to the play clock. The play clock operator runs the timer, and an official on the field watches for the ball to be snapped. When the clock expires and the ball has not been snapped, the official throws the flag and the referee announces the penalty.
Officials are also trained to watch for cases where the clock runs out for reasons that are not the offense's fault. If the ball is not ready for play because the officials are still spotting it, or if the clock runs while an official is walking off a measurement, the play clock does not begin until the ball is ready. A good crew resets the clock rather than penalize a team for an administrative delay.
Common questions
What happens to the clocks at the two-minute warning? The warning is a stoppage in play that has its own rules for how the clocks restart. See our guide to the two-minute warning and late-game clock rules for what changes late in a half.
What if the play clock is broken? If the operator or display has a problem, the referee can stop play and reset it. Teams should not be punished for equipment failure.
Is the play clock the same as the clock in the corner of the TV screen? No. The broadcast graphic shows the game clock. The play clock is usually shown separately, on stadium displays, and some broadcasts add it as a second graphic.
What to watch for
Next time you watch a game, look at the back of the end zone and see how close the offense cuts it. Teams under pressure often snap the ball with one or two seconds left. If a flag comes out, check whether it is delay of game or something else, such as a false start or an illegal substitution. You can follow live game flow on the scores page, and the teams pages let you look up the clubs whose habits you want to compare.
The short version
- The play clock limits the time between plays. In the NFL and college it is generally 40 seconds, or 25 seconds after certain stoppages.
- High school play clocks vary by state association, and some games use none.
- Delay of game is a five-yard penalty, enforced before the snap, with the down replayed.
- Delay of game can also be called for stalling, for a timeout that a team does not have, and for other delays.
- The NFL cuts off the headset communication to the quarterback and one defender when the play clock reaches 15 seconds.
- Teams sometimes take the penalty on purpose, but most coaches treat it as a cost to avoid.