Green Monster
The Green Monster is a popular nickname for the left field wall at Fenway Park, home to the Boston Red Sox of Major League Baseball. The wall is from home plate at the left-field foul line, making it a popular target for right-handed hitters.
Overview
The wall was part of the original ballpark construction of 1912, along Fenway's north side facing Lansdowne Street. It is made of wood and was covered in tin and concrete in 1934. It was then covered with hard plastic in 1976. A manual scoreboard is set into the wall, which has been there, in one form or another, at least as far back as 1914. The wall was not painted green until 1947; before that, it was covered with advertisements.The "Green Monster" designation appeared in print by November 1956, although for much of its history it was simply called "The Wall", an alternate nickname that has endured into the 21st century.
The Green Monster is the highest among the walls in current Major League Baseball fields, and it is the second highest among all professional baseball fields, including Minor League Baseball. In 2007, it was surpassed by "The Arch Nemesis"—the left field wall of the independent baseball WellSpan Park in York, Pennsylvania—which is approximately taller.
Ballparks occupied by professional baseball teams have often featured high fences to hide the field from external viewers, particularly behind open areas of the outfield where bleacher seating is low-lying or non-existent. The wall might also reduce the number of "cheap" home runs due to the barrier's relatively tall height above the playing surface. Fenway's wall serves both purposes. Past ballparks of Fenway's era or even later which featured high fences in play included Baker Bowl, Washington Park, Ebbets Field, League Park, Griffith Stadium, Shibe Park, and more recently, Los Angeles Memorial Coliseum. Fenway is the last of the exceptionally high-walled major-league ballparks. In modern ballparks, some relatively high walls have been constructed for their novelty rather than by necessity.
During 2001 and 2002, the Green Monster's height record was temporarily surpassed by the center field wall at Riverfront Stadium in Cincinnati. During construction of the adjacent Great American Ball Park, a large section of seats was removed from Riverfront's center field area to make room and a black wall was erected as a temporary batter's eye. The entire wall was in play. This new wall was often called the "Black Monster". When Riverfront Stadium was demolished in 2002, the Green Monster reclaimed the record.
In honor of the wall, the Red Sox' mascot is Wally the Green Monster. In May 2025, the Red Sox announced a new City Connect jersey which pays homage to the Green Monster, featuring a solid green color and lettering in the same font as the letters on the wall.
Dimensions
The wall is tall. At wide, it has an overall surface area of.The wall is signed as being 310 feet from home plate at the left-field foul line, although for many years, until May 1995, it was signed as being 315 feet. The posted distance in metric was not adjusted from to until 1998. The wall is signed as being deep near the ballpark's flagpole in center field, where a vertical yellow line denotes the rightmost limit of the wall that is in play. A portion of the wall continues behind the flagpole, but a ball hit to this area is considered a home run.
By contrast, the right-field wall is less than tall. While it is signed as being only from home plate at the Pesky Pole along the right-field foul line, it sharply angles back and is signed as being deep at the right end of the bullpens. This makes the overall expanse of Fenway's right field significantly larger than left field.
Effect on play
The Green Monster is famous for preventing home runs on many line drives that would clear the walls of other ballparks. A side effect of this is to increase the prevalence of doubles, since this is the most common result when the ball is hit off the wall. The major-league record for doubles in a season was set by Red Sox player Earl Webb, who hit 67 doubles in 1931, although only 33 of them were hit at Fenway. This record has rarely been challenged, and no player has hit 60 or more doubles in a season since 1936.Some left fielders, predominantly those with significant Fenway experience, have become adept at fielding caroms off the wall to throw runners out at second base or hold the batter to a single. Compared with other current major-league parks, the wall's placement creates a comparatively shallow left field, and many long fly balls that could be caught in a larger park rebound off the Green Monster for base hits.
While the wall turns many would-be line-drive homers into doubles, it also allows some high yet shallow fly balls to clear the field of play for a home run, one notable example being Bucky Dent's home run in the 1978 American League East tie-breaker game. As described by Don Baylor, who played for the Red Sox in 1986 and 1987: "High fly balls that are outs almost anywhere else will be a home run here, but low line drives that are home runs almost anywhere else will only be a double here, maybe even a single."
Features
Duffy's Cliff
From 1912 to 1933, a mound formed an incline in front of the Green Monster, extending from the left-field foul pole to the center field flag pole. This earthwork formed a "terrace", a common feature of ballparks of the day, whose purpose was to make up the difference in grade between street level and field level, as with Cincinnati's Crosley Field. It also served to double as a seating area to handle overflow crowds, another common practice of that era.As a result of the terrace, when overflow crowds were not seated atop it, a left fielder in Fenway Park had to play the territory running uphill. Boston's first star left fielder, Duffy Lewis, mastered the skill so well that the area became known as "Duffy's Cliff". In contrast, rotund outfielder Bob Fothergill, known by the indelicate nicknames of "Fats" or "Fatty", reportedly once chased a ball up the terrace, slipped and fell, and rolled downhill.
In 1934, Red Sox owner Tom Yawkey arranged to flatten the ground in left field so that Duffy's Cliff no longer existed, and it became part of the lore of Fenway Park.
Scoreboard
Long after the much-higher location manual scoreboard from c.1914 existed, the placement of the modern "ground-level" manual scoreboard occurred in 1934. It forms the lower half of the Green Monster and is still updated by hand from behind the wall throughout the game. The American League scores are also updated from behind the wall. The National League scores need to be updated from the front of the wall between innings. There is also a board which shows the current American League East standings. There are 127 slots in the wall and a team of three score keepers move around, plates to represent the score. Yellow numbers are used to represent in-inning scores and white numbers are used to represent final inning tallies. The numbers of the current pitchers weigh and measure.Carlton Fisk's "body English" when he hit his game-winning home run in Game 6 of the 1975 World Series, "waving" the ball fair, was captured on a TV camera stationed in the scoreboard.
Morse code
In the vertical white lines of the American League section of the scoreboard, Morse code representing the initials of former owners Thomas A. Yawkey and Jean R. Yawkey is visible. As shown in various photos of the wall, the patterns are and , each of which runs from top to bottom in a white stripe.The ladder
Comprising yet another quirk, a ladder is attached to the Green Monster, extending from near the upper-left portion of the scoreboard, above ground, to the top of the wall. Previously, members of the grounds crew would use the ladder to retrieve home run balls from the netting hung above the wall. After the net was removed for the addition of the Monster seats, the ladder ceased to have any real function, yet it remains in place as a historic relic.The placement of the ladder is noteworthy given the fact that it is in fair territory; it is the only such ladder in the major leagues. On various occasions, a batted ball has struck the ladder during game play. Carl Yastrzemski, who played for the Red Sox for 23 seasons including over 1900 games in left field, highlighted the ladder's role in an inside-the-park home run by Red Sox first baseman Dick Stuart, generally regarded as slow-footed. On August 19, 1963, Stuart hit a high fly ball that ricocheted off the Green Monster—Yastrzemski said it hit the ladder, while contemporary newspaper reports noted that it "skinned off the wall" or "struck a ledge on top of the scoreboard"— and then off the head of Cleveland outfielder Vic Davalillo, before rolling far enough away to allow Stuart to score. An account of another inside-the-park home run that hit off the ladder, appearing in an October 1986 column by Dave Anderson of The New York Times, reportedly hit by visiting player Jim Lemon during the 1950s with Red Sox defenders Ted Williams in left field and Jimmy Piersall in center field, lacks detail or contemporary mention in newspapers.
A common myth that has perpetuated is that if a ball strikes the ladder and then bounces over the wall or out of play, the batter will be awarded a ground-rule triple. There is no such rule in the ground rules at Fenway, nor in any major-league ballpark. Fenway's ground rules state: "Fair ball striking the ladder below top of left field wall and bounding out of park: Two Bases."