Baseball Field Lines

Get ready to learn about the lines you see on a baseball field. We'll explain all the lines you need to know to play the game and understand as a fan.


To understand baseball, we must first learn about the playing surface or the baseball field. There are two (2) types of lines you should know:

The Foul Lines

The foul lines, often colored white or yellow, partially outline the field of play. They extend from the batter's box to the foul poles located deep into left field and right field. We'll learn more about the batter's box and foul poles later in this chapter.

Baseball Foul Line

The Baselines

The baselines are the straight lines in between each of the bases. The baselines between 1st base and 2nd base, and 2nd base and 3rd base are invisible and not marked on a baseball field. However, the baselines between home plate and 1st base, and 3rd base and home plate coincide with the foul line.

Baseball Baseline

IMPORTANT: The baselines are important for baserunning, which we'll learn more about in future chapters.

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