Early Years and Expansion
The Colorado Rockies began as an expansion team in 1993, making them one of the newer franchises in Major League Baseball. They played their first season at Mile High Stadium while waiting for their new home to be built. The team was named the Rockies to represent the Rocky Mountains that surround Denver. In their inaugural season, they surprisingly made the playoffs, which was rare for a brand new team.
Coors Field and the 1990s
The Rockies moved into their new home, Coors Field, in 1995. The stadium became famous for its high elevation and the way thin air affected how baseballs traveled. This meant more home runs were hit at Coors Field than in most other stadiums. The team continued to be competitive throughout the 1990s, making it to the playoff games multiple times and attracting many fans in Denver.
The 2007 World Series Championship
The Rockies' greatest achievement came in 2007 when they won the World Series. That year, the team had an amazing season and defeated the Boston Red Sox in the World Series. This was the first and only championship in the franchise's history. The 2007 team is considered one of the most successful groups of players in Rockies history.
Recent History
After their 2007 championship, the Rockies have had mixed success. The team has made the playoffs a few more times but has not won another World Series. The Rockies continue to compete in the National League West division alongside teams like the Los Angeles Dodgers and San Francisco Giants. They remain an important part of Denver's sports culture. 
Answer