Is flag guarding on us or on them?
Flag guarding is always on the ball carrier, which means it is on the offense, which means it is on you when your runner does it. It is the act of using a hand, an arm, the football or the jersey to stop a defender getting to a flag: a hand dropped over the hip, a stiff arm, a shoulder lowered into the defender, a shirt left untucked and hanging over the belt. NFL FLAG lists it in its 2025 Official Playing Rules under Running, rule 10. Every rulebook has some version of it, and the yardage they attach varies, so check your own.
The yard he never got to. The LB took the right angle and covered about 7.8 yards to arrive in front of the belt. His line stops in a bar rather than an arrow, because something got between his hand and the flag, and the runner's line carries on to the sideline. That gap is the foul, and it is the reason the rule exists at all.
Why this is a penalty on the offense
The flag has to be reachable, or the sport does not work
Everything in flag football rests on one thing being true: a defender who gets to the right place can end the down. A runner who covers his flag has quietly removed the only way anybody can stop him, and no amount of good defense fixes that. The rule exists to keep the flag available.
The name is the reason coaches get it backwards
Flag guarding sounds like something a defender does to a receiver, and half the sideline hears it that way the first time. It is the opposite. The player guarding the flag is the player wearing it, and the penalty lands on his team.
It is usually instinct, not cheating
A child who has watched football has watched runners stiff arm and cover the ball, and both of those movements put a hand exactly where this rule forbids one. Treat it as a habit to replace rather than as a discipline problem, because that is what it is.
The same pursuit, with and without a hand in the way
Identical play, identical defender, identical angle. One runner leaves his flags alone and the other does not, and everything downstream of that follows from it.
- Flags left aloneLegalThe legal version: the defender's path reaches the ball carrier and the carrier's line ends there.
The defender's line arrives at the runner and the run ends on that yard. This is what the down is supposed to look like, and it is the picture you want your own runners producing.
The pull lands, and the play is over. The runner ran. He did not slow down, drop a hand, or turn his hip away, and the defender who beat him to the spot got what he earned. Nothing here needs an official to make a judgement.
- A hand over the flagIllegalThe illegal version: the defender's path stops short in a bar, a ring marks the gap, and the carrier keeps running.
The reach ends two yards early and the run does not end at all. The picture reads as a great play by the runner, which is precisely why the rulebook takes it back.
How to coach it out, in the order that works
- 1
Tuck the jersey in, every player, before every game
Start here because it is free and it is the version nobody notices. A shirt hanging over the belt guards the flag whether the runner meant it to or not, and in most rulebooks it is called the same way. Make it part of the pre-game the way shoelaces are.
- 2
Give the hands a job: the ball, with both of them
A runner told not to use his hands will still use them, because you have given him a rule and no replacement. A runner told to carry the ball high and tight with both hands has nothing left to guard with, and he fumbles less, which is the argument he will actually accept.
- 3
Teach him to run away from the pull, not around it
The instinct at the moment of contact is to turn the hip away and drop the arm. The habit you want instead is to keep the shoulders square and accelerate. It is faster anyway, and it is the only version that cannot be called back.
- 4
Call it in practice, out loud, the first week
Blow the whistle and take the yards in your own scrimmage. A child who has lost ten yards in practice for dropping a hand will not do it in a game, and a child who has only been told about it will.
What varies between leagues
The yardage and the spot
Leagues differ on both. Some take the yards from the spot of the foul, some from the previous spot, and the number is commonly five or ten. Since flag guarding usually happens after a long gain, the spot matters more here than on almost any other penalty in the book.
Spinning, and whether you are allowed to
A spin is legal in some rulebooks and prohibited in others, and where it is legal it stops being legal the moment an arm comes down. This is worth checking specifically, because a spin move is the single most attractive thing on a youth field and your best runner will find it on his own.
The stiff arm
Banned everywhere we have read, and usually written as its own line rather than folded into flag guarding. It is worth saying to a team separately, because a child who has seen one on television does not connect it to a rule about flags.
Where it actually shows up
On the long run, right as the defender closes
This is where it lives. A runner twenty yards downfield with one man left will do whatever his body suggests, and what his body suggests is an arm. It is also the most expensive place for it to happen, because the penalty usually takes the gain with it.
On the spin, when the arm follows the shoulder
Even in leagues where spinning is fine, the arm that comes down during the turn is not. The two movements are so close together that a runner cannot tell them apart, which is why the safer teach at young ages is not to spin at all.
On the quarterback, scrambling
He has the ball in one hand, he is looking downfield, and his free arm is doing whatever it likes. Quarterbacks commit this foul more than anybody and get coached on it least, because nobody thinks of the quarterback as a ball carrier until he is one.
Take it to your team
Draw your plays in the free play designer, collect them in the flag football playbook builder, and print football play cards so every player knows them come Saturday.
Show your runners what the defender sees
Open the play designer, draw the run and the pursuit angle on one field, and print it for Tuesday. Free.
Open the play designerRelated questions
Is flag guarding on the offense or the defense?
What counts as flag guarding?
What is the penalty for flag guarding?
Can you spin to avoid a flag pull?
Related guides
Coach Ray Carroll
Coaches 5v5 flag football from kindergarten through 7th grade in San Mateo and San Carlos, California, and built RC Football to design, teach and print the plays his own teams run.