**History**
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The 1911 Denver Grizzlies were recognized as one of the 100 greatest minor league teams of all time.
Denver had long been a hotbed of minor league baseball as far back as the late 19th century with the original Denver Bears (or Grizzlies) competing in the Western League before being replaced in 1955 by a Triple-A team of the same name. Residents and businesses in the area desired a Major League team. Denver's Mile High Stadium was built originally as Denver Bears Stadium, a minor league baseball stadium that could be upgraded to major league standards. Several previous attempts to bring Major League Baseball to Colorado had failed. In 1958, New York lawyer William Shea proposed the new Continental League as a rival to the two existing major leagues. In 1960, the Continental League announced that play would begin in April 1961 with eight teams, including one in Denver headed by Bob Howsam. The new league quickly evaporated, never playing a game, when the National League reached expansion agreements to put teams in New York City and Houston, removing much of the impetus behind the Continental League effort. Following the Pittsburgh drug trials in 1985, an unsuccessful attempt was made to purchase the Pittsburgh Pirates and relocate them. However, in January 1990, Colorado's chances for a new team improved when Coors Brewing Company became a limited partner with the AAA Denver Zephyrs.
**1990s**
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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, now 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.
The Rockies in June 2007. Later the same year, Colorado won its first NL pennant
In 1993, they began play in the National League West. That year the Rockies set the all-time Major League record for attendance, drawing 4,483,350 fans, still the MLB record. The Rockies were MLB's first team based in the Mountain Time Zone.
**2000s**
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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. 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 October run "Rocktober".
**2010s**
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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.
**2020s**
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In 2023 and 2024, the Colorado Rockies lost over 100 games each season (103 games in 2023 and 101 in 2024). In 2025, the Rockies obtained the worst start to a season of any team through 39 games, starting off at 6–33 (.154 winning percentage). The Rockies then fell to 30 games below .500, accomplishing that mark in just 44 games. Their record was 7–37, a .159 winning percentage. The Rockies continued their abysmal start to the 2025 season by setting the record for the worst team record through 50 games. Their record of 8–42 (.160 winning percentage) was worst 50 game start of any team in Major League baseball history, two games worse than the 2023 Oakland Athletics 10–40 start (.200 winning percentage). The 2025 Colorado Rockies' 10–50 (.167 winning percentage) record after 60 games eclipsed the 11-49 previous worst 60 game mark held by five teams: the 1886 Washington Nationals, the 1895 Louisville Colonels, the 1897 St. Louis Browns, the 1904 Washington Senators, and the 1932 Boston Red Sox. The Rockies finished tied with the 2003 Detroit Tigers for the third most losses in baseball history since 1901. They two less losses than the 2024 Chicago White Sox and one fewer loss than the 1962 expansion team the New York Mets. The Rockies also ended the season with the worst modern-era run differential of -424, easily shattering the previous worst held by the 1932 Boston Red Sox who had a run differential of -349.
In June 2025, the franchise promoted Walker Monfort, son of owner Dick Monfort, to team president.
^ "Top 100 Teams". MiLB.com. 2001. Retrieved May 9, 2017.
- ^ Routon, Ralph (January 25, 1978). "Op-Ed: Major League Baseball in Denver a Nice Thought". Colorado Springs Gazette-Telegraph. p. 21. Archived from the original on January 2, 2021. Retrieved May 27, 2020.
- ^ a b "Pittsburgh Pirates could move to Denver if ..." The Daily Sentinel. November 10, 1981. p. 15. Archived from the original on January 2, 2021. Retrieved May 27, 2020.
- ^ "Denver Always Rebuilding, Can't Seem to Finish Job 1960-1970 history". Colorado Springs Gazette-Telegraph. January 4, 1970. p. 41. Archived from the original on January 2, 2021. Retrieved May 27, 2020.
- ^ "Colorado must be ready when major leagues beckon". The Daily Sentinel. January 7, 1990. p. 29. Archived from the original on January 2, 2021. Retrieved May 27, 2020. Denver received a big boost this past week when Coors Brewing Co. signed a letter of agreement to become a limited partner in the Denver Zephyrs, a Class AAA franchise playing in the American Association. ... "The addition of Coors is a tremendous boost to our efforts, said Suplizio. Multiple ownership is a requirement by Major League Baseball and no one else has the muscle that we've been able to muster in the Rocky Mountain region.
- ^ "It's official: Colorado Rockies in". The Daily Sentinel. July 5, 1991. p. 10. Archived from the original on January 2, 2021. Retrieved May 27, 2020.
- ^ Wojciechowski, Gene (October 22, 2007). "Rockies born of Monus' work, but he never saw his baby grow up". ESPN.com. Retrieved June 1, 2024.
- ^ 2007 Colorado Rockies Schedule and Results. Baseball-Reference.com. Retrieved October 15, 2014.
- ^ Saunders, Patrick (October 23, 2012). "Rocktober: When the Rockies accomplished the impossible in 2007". The Denver Post. Retrieved December 22, 2020.
- ^ NLDS Game 1: Colorado Rockies at Milwaukee Brewers. October 4, 2018. Fox. FS1.
- ^ "Brewers 4-0 Rockies (Oct 5, 2018) Final Score". ESPN. Retrieved April 8, 2026.
- ^ "What are the worst records in MLB history?". ESPN.com. May 11, 2025. Retrieved May 17, 2025.
- ^ "Worst records to start an MLB season". MLB.com. Retrieved May 22, 2025.
- ^ "Worst MLB Regular Season Records Through 60 games". champsorchumps.us. Retrieved June 4, 2025.
- ^ "Rockies planning to utilize Senzatela as reliever in '26". mlb.com Rockies. Retrieved September 29, 2025.
- ^ "These teams lost at least 110 games". mlb.com. September 28, 2025. Retrieved September 29, 2025.
- ^ Press, Associated (June 26, 2025). "Rockies promote owner's son Walker Monfort to leadership role". ESPN.com. Retrieved March 27, 2026.
- ^ Saunders, Patrick (March 27, 2026). "Meet Walker Monfort, the Rockies heir charged with resurrecting Colorado's flailing MLB franchise". The Denver Post. Retrieved March 27, 2026.