In 1991, as part of Major League Baseball's two-team expansion (along with the Florida (now Miami) Marlins), an ownership group representing Denver led by John Antonucci and Michael I. Monus was granted a franchise. They took the name "Rockies" due to Denver's proximity to the Rocky Mountains, which is reflected in their logo; the name was previously used by the city's first NHL team (who are now known as the New Jersey Devils). Monus and Antonucci were forced to drop out in 1992 after Monus's reputation was ruined by an accounting scandal. Trucking magnate Jerry McMorris stepped in at the 11th hour to save the franchise, allowing the team to begin play in 1993. The Rockies shared Mile High Stadium with the National Football League (NFL)'s Denver Broncos for their first two seasons while Coors Field was constructed. It was completed for the 1995 Major League Baseball season.
In 1993, they started play in the West division of the National League. That year the Rockies set the all-time Major League record for attendance, drawing an incredible 4,483,350 fans (a record that stands to this day). The Rockies were MLB's first team based in the Mountain Time Zone. They have reached the Major League Baseball postseason five times, each time as the National League wild card team. Twice (1995 and 2009) they were eliminated in the first round of the playoffs. In 2007, the Rockies advanced to the World Series, only to be swept by the Boston Red Sox. The team's stretch run was among the greatest ever for a Major League Baseball team. Having a record of 76-72 at the start of play on September 16, the Rockies proceeded to win 14 of their final 15 regular season games. The stretch culminated with a 9-8, 13-inning victory over the San Diego Padres in a one-game playoff for the wild card berth. Colorado then swept their first seven playoff games to win the NL pennant (thus, at the start of the World Series, the Rockies had won a total of 21 out of 22 games). Fans and media nicknamed their improbable run in October, Rocktober.
Colorado made postseason berths in 2017 and 2018. In 2018, the Rockies became the first team since the 1922 Philadelphia Phillies to play in four cities against four teams in five days, including the 162nd game of the regular season, NL West tie-breaker, NL Wild Card Game and NLDS Game 1, eventually losing to the Milwaukee Brewers in the NLDS.
Like their expansion brethren, the Miami Marlins, they have never won a division title since their establishment and they, along with the Pittsburgh Pirates are also one of three MLB teams that have never won their current division. The Rockies have played their home games at Coors Field since 1995. Their newest spring training home, Salt River Fields at Talking Stick in Scottsdale, Arizona, opened in March 2011 and is shared with the Arizona Diamondbacks.