What is a Bullpen
The area where relief pitchers warm up before entering the game.
The bullpen is the designated area in a baseball stadium where relief pitchers warm up before entering a game. It typically consists of a practice pitching mound, a home plate, and seating for pitchers and coaches waiting to be called into action. The bullpen is one of the most strategically important elements of modern baseball.
Where Is the Bullpen Located?
The bullpen is most commonly located beyond the outfield fence — either down the left-field or right-field foul lines, or in some cases behind the outfield wall. In older stadiums, bullpens were sometimes located along the foul lines in foul territory. Each team has its own bullpen, and in many stadiums both bullpens are visible to fans.
What Happens in the Bullpen?
Relief pitchers who are not yet in the game sit in the bullpen, ready to warm up at a moment's notice. When a manager decides to make a pitching change, a coach or the manager calls down to the bullpen to have the appropriate pitcher begin warming up. A pitcher must throw enough warm-up pitches to be game-ready before taking the mound.
The Role of the Bullpen in Modern Baseball
Modern baseball has seen the bullpen grow dramatically in importance. Where teams once relied on their starting pitcher to throw complete games, today's starters rarely pitch beyond six or seven innings. The bullpen arms — relievers, setup men, and closers — are counted on to finish games.
Key bullpen roles include:
- Middle relievers — Typically enter in the fourth through seventh innings to bridge the gap between the starter and the closer.
- Setup man — Pitches the eighth inning, holding a lead ahead of the closer.
- Closer — The team's best reliever, usually brought in to record the final three outs and secure a win.
The best bullpen arms tend to be high-strikeout pitchers — getting swings and misses is far more reliable than depending on fielders to make plays in pressure situations.
Bullpen Management
A manager's ability to manage the bullpen is one of the most discussed skills in baseball. Knowing when to pull a starter, which reliever to use in which matchup, and how to preserve arms over a 162-game season can be the difference between a playoff run and a losing record.
Teams with a deep, reliable bullpen are often more successful in the postseason, where bullpen use is even heavier than during the regular season.
Origin of the Term
The origin of the word "bullpen" as applied to baseball is debated. Popular theories include a reference to the Bull Durham tobacco ads that were once painted on outfield fences near where pitchers warmed up, or to livestock holding pens that large fenced-off areas resembled.