Colorado upset the Florida Marlins, 18-17, on July 4, 2008, after trailing 13-4 at one point. The Rockies overcome a nine-run deficit to win their biggest comeback game ever. This page should be updated. The Colorado Rockies' history began in 1991, when an ownership group led by John Antonucci was given a Major League Baseball (MLB) expansion club for Denver, Colorado. The Colorado Rockies debuted in the National League (NL) West division in 1993. The Rockies have made the MLB playoffs four times since then, each time as the National League wild card club. They were ousted in the first round of the playoffs twice (1995 and 2009). The Rockies made it all the way to the World Series in 2007, only to be swept by the Boston Red Sox. Bryn Smith was the winning pitcher, defeating his previous club. In the bottom of the first inning, second baseman Eric Young of the Rockies hit a leadoff home run, one of the most famous plays in the game and in franchise history. On April 17, 1994, the Rockies defeated Montreal 6-5, bringing the team's record to 6-5 for the first time in franchise history. However, that was the only time the team had a record above.500 that season, as they finished 53-64 and last in the National League West during the strike-shortened season. History. They began participating in the National League's West division in 1993. The Rockies were the first MLB team to be established in the Mountain Time Zone. I've made it to the Major League Baseball playoffs five times, each time as a National League wild card squad. They were ousted in the first round of the playoffs twice (in 1995 and 2009). They've made the Major League Baseball playoffs five times, all as the National League wild card club. They were ousted in the first round of the playoffs twice (in 1995 and 2009). The Rockies reached the World Series in 2007, only to be swept by the Boston Red Sox.