SportRules.org
Baseball

Fair territory or foul territory?

Fair and foul territory decide whether a batted ball is live action, a dead foul ball, a catchable foul fly, or a home run near the pole. The ruling is not based on where the fielder stands or where the ball first looked like it was heading. It is based on where the ball is when the rule tells the umpire to judge it.

Quick ruling: the foul lines and foul poles are part of fair territory. A batted ball is judged fair or foul by its position when it first touches a fielder, first lands beyond first or third base, passes first or third base, settles before either base, or leaves the field. Before first or third base, a rolling ball can still change from fair to foul or foul to fair.
Decision path

How umpires check it

  1. Identify whether the batted ball is in the air, on the ground, rolling, bouncing, touched by a fielder, or leaving the field.
  2. If the ball is touched before it settles, lands beyond a base, passes a base, or leaves play, judge fair or foul by where the ball is when touched.
  3. If the ball first lands beyond first or third base, judge it by where it first contacts the ground.
  4. If the ball rolls or bounces past first or third base, judge whether it passes the base on or over fair territory or foul territory.
  5. If the ball stops before first or third base, judge where it finally settles.
  6. Apply any special rule for a base, foul pole, boundary, lodged ball, fan interference, or local ground rule.
Field layout

What counts as fair territory

Fair territory is the area between the first-base and third-base foul lines, including the foul lines themselves. The lines continue from home plate through first and third base and out to the fence or other boundary. The foul poles are treated as fair markers, not foul markers.

Foul territory is the area outside those lines. Because the line is fair, a ball touching the chalk line, crossing over the line, or striking the foul pole can be fair even if most of the ball or the fielder is outside the line.

Before the bases

A slow roller can still change

Between home plate and first or third base, a ground ball is not locked in as fair or foul just because it first hits the dirt on one side of the line. If it has not yet touched a player or other object, the umpire can wait until it settles or reaches the base area.

A ball that starts fair near home plate and spins foul before first base is foul if it settles or is touched in foul territory. A ball that starts foul near home plate and spins back fair before first base can be fair if it settles or is touched in fair territory.

At the bases

First and third base matter

First base and third base are in fair territory. If a batted ball touches either base, it is fair. That is true even if the ball then bounces into foul territory.

For a bounding ball that goes past first or third without touching the base, the key question is where the ball passes the base. If it passes on or over fair territory, it is fair. If it passes on or over foul territory, it is foul.

Beyond the bases

First landing or first touch controls

Once a batted ball first lands beyond first or third base, the fair-foul ruling normally follows that first landing spot. A fly ball that lands in fair territory beyond the base is fair even if it later kicks foul. A fly ball that lands in foul territory beyond the base is foul unless another rule changes the result.

If a fielder touches the batted ball before it lands or passes the deciding point, judge the ball by its position when touched. The fielder's feet do not control the ruling. A player standing in foul territory can touch a ball over fair territory and make it fair; a player standing in fair territory can touch a ball over foul territory and make it foul.

In the air

Foul flies can still be outs

Foul territory is not a free area for the batter while the ball is in flight. If a defensive player legally catches a foul fly before it touches the ground or goes out of play, the batter is out.

After a legal catch, the ball generally remains live and runners may advance under ordinary tag-up rules. If the catch carries a fielder into a dead-ball area or a local boundary rule applies, the rule set or ground rule controls any base awards.

Foul pole

The pole is fair

A batted ball that strikes the foul pole on the fly is fair. If it is high enough and otherwise satisfies the home-run rule, it is a home run. The name can be misleading: the pole helps judge the edge of fair territory, but the pole itself is not foul territory.

A ball that leaves the field on a fly outside the pole is foul. Around unusual walls, railings, roofs, padding, netting, or other park features, ground rules may be needed to decide whether the ball is fair, foul, in play, or out of play.

Home plate

Home plate does not make it foul

A batted ball that hits home plate is not automatically foul. Home plate sits in fair territory for this purpose, and the ball remains judged by what happens next.

If the ball hits the plate and settles fair before first or third, it is fair. If it hits the plate and rolls foul before first or third, it is foul unless it touches a player or another deciding event occurs while the ball is over fair territory.

Common mistake

"The fielder was in foul ground"

The fielder's body position is not the fair-foul test. Umpires judge the ball's position relative to fair or foul territory at the moment that matters. A third baseman can stand with both feet in foul territory and touch a spinning bunt over the line in fair territory, making it a fair ball.

Common mistake

"It landed fair first, so it is fair"

That is only reliable once the ball first lands beyond first or third base. Before first or third, a ground ball can change status as it rolls or spins. This is why players often let a slow roller near the line continue moving instead of touching it immediately.

Practical examples

Five plays to separate them

  • Bunt lands foul near home, then rolls fair and stops before first: fair ball.
  • Ground ball starts fair, then rolls foul and settles before third: foul ball.
  • Line drive lands fair beyond first, then bounces into the stands: fair ball first, then dead-ball award if it leaves play.
  • Fly ball is caught by a fielder standing in foul territory while the ball is over foul territory: foul fly caught, batter out.
  • Deep fly hits the foul pole above the fence: fair ball and usually a home run.
Rule sets

Where details can vary

The core fair-foul principles are widely shared across baseball, but the setting can still matter. Youth leagues, school rules, tournament rules, softball codes, and local field rules may handle dead-ball areas, temporary fences, overhanging objects, lodged balls, replay, or appeal procedures differently.

For an actual game, use the rule book adopted by that competition and the ground rules announced for that field. The general fair-foul test is stable, but unusual boundaries are often local by design.