Parts of a Baseball Field – Labeled Diagram and Quiz

All 19 parts on the diagram

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The whole field 14

Infield By rule a 90-foot square. Home plate and the three bases are at its corners. In everyday talk the name also takes in the ground just outside the square.
Outfield Fair ground from the infield out to the fence.
Pitcher's mound The pitcher throws from the slab on top. The slab is called the pitcher's plate or the rubber.
First base A square bag fixed to the ground. It sits wholly inside the infield.
Second base The bag is centered on its corner of the square. It is on the line from home plate through the pitcher's mound.
Third base A square bag like the other two. It sits wholly inside the infield.
Foul line The lines run past first base and third base. The ground between them, lines included, is fair territory; everything outside is foul territory.
Foul pole It carries the foul line upward. Then an umpire can judge a high fly ball. A fly ball that hits the pole is a home run.
Outfield fence Also called the outfield wall. A fair ball that flies over it without touching the ground is a home run.
Warning track It feels different from grass underfoot. A fielder watching a fly ball can then tell that the fence is near.
Bullpen Its place depends on the ballpark. It lies in foul ground along a baseline or, as drawn here, just beyond the outfield fence.
Coach's box The first base coach and the third base coach stand in them.
Dugout The rule book asks for one bench for each team. Roofed and closed in at the back and the ends.
Stands The seating around the field. Only the part that wraps the infield is drawn here.

Around home plate 5

Home plate A five-sided slab of rubber set level with the ground. Its point is where first and third base lines cross. Officially home base.
Batter's box The batter stands in one of them to face the pitcher. The boxes are usually chalked on the dirt.
Catcher's box The catcher must stay inside until the pitcher lets go of the ball.
On-deck circle One per team, in foul ground from home plate toward its bench. The rule book calls it the next batter's box.
Backstop It stops balls that get past the catcher. It also protects the people sitting behind it.

How this list was compiled: Every name and detail checked on 2026-09-30, a name kept only where two of these use it: (1) Official Baseball Rules, 2025 edition, rules 2.01 to 2.05 and the diagrams in Appendices 1 and 2, https://mktg.mlbstatic.com/mlb/official-information/2025-official-baseball-rules.pdf (the infield a 90-foot square; the outfield between the two foul lines; fair and foul territory; home base a five-sided slab of whitened rubber with its point where the base lines meet; the first and third base bags wholly inside the infield and the second base bag centered; the pitcher's plate; the catcher's box, batters' boxes, coaches' boxes and next batter's boxes; the backstop; the roofed benches; the foul poles and the fence); (2) Wikipedia, Baseball field, text only, https://en.wikipedia.org/wiki/Baseball_field (the bases named counterclockwise from home plate; the everyday meaning of infield; the pitcher's mound and rubber; the outfield wall or fence and the home run; the foul poles; the warning track; the bullpen; the on-deck circles; the coach's boxes; the batter's and catcher's boxes; the backstop); (3) Zack Hample, Watching Baseball Smarter, Vintage, 2007, searched in full text at https://archive.org/details/watchingbaseball00hamp_0 (warning track, on-deck circle, pitcher's mound, dugout, bullpen, backstop, foul pole). Licence: own work

The drawing: Drawn for this site on 2026-09-30 from plain geometry; nothing traced. Not to scale. Licence: own work

How it works

The parts of a baseball field fit inside two foul lines that spread from home plate: a square infield, then a wide outfield that ends at a fence.

Read the full guide

The whole field

Start with the infield, the square with a base at each corner and the pitcher's mound in the middle. The outfield lies beyond it, between the two foul lines. Follow a foul line out to its foul pole, then along the fence and the warning track. The coach's boxes, the dugouts, the bullpens and the stands are all outside the lines.

Around home plate

The second view enlarges one corner. A batter's box lies on each side of home plate and the catcher's box behind it. Farther back are the two on-deck circles and the backstop.

Counterclockwise from home plate the corners go first base, second base, third base.
The foul lines and the foul poles are in fair territory, whatever their names say.

Questions and answers

What are the parts of a baseball field called?

The infield holds home plate, first, second and third base and the pitcher's mound. The outfield lies beyond it. Two foul lines run from home plate to the foul poles on the outfield fence, and a warning track follows the fence.

What are the parts of a baseball diamond?

The diamond is the infield, a square with 90 feet between its corners. Home plate and the three bases mark the corners, and the pitcher's mound stands near the middle, on the line from home plate to second base.

What are the parts of a baseball stadium?

Around the field a stadium has the stands, a dugout for each team, a backstop behind home plate, bullpens where pitchers warm up, and an outfield fence with a foul pole at each end. No two ballparks have quite the same shape.

What is the difference between the infield and the outfield?

By rule the infield is the square marked by the four bases, and the outfield is the rest of the ground between the foul lines, out to the fence. Both are fair territory.