The Colorado Rockies played 24 games in the month of September 1999. Here are the results of those games:
- September 1, 1999: Rockies vs. Milwaukee Brewers (Rockies win, 5-3)
- September 2, 1999: Rockies vs. New York Mets (Mets win, 6-5)
- September 3, 1999: Rockies vs. Florida Marlins (Marlins win, 11-5)
- September 4, 1999: Rockies vs. Montreal Expos (Rockies win, 5-3)
- September 6, 1999: Rockies vs. Los Angeles Dodgers (Dodgers win, 10-7)
- September 8, 1999: Rockies vs. Arizona Diamondbacks (Diamondbacks win, 3-2)
- September 9, 1999: Rockies vs. San Francisco Giants (Giants win, 15-5)
- September 10, 1999: Rockies vs. Los Angeles Dodgers (Dodgers win, 10-7)
- September 11, 1999: Rockies vs. Arizona Diamondbacks (Diamondbacks win, 9-5)
- September 12, 1999: Rockies vs. San Francisco Giants (Giants win, 6-4)
- September 13, 1999: Rockies vs. Colorado Springs Sky Sox (Sky Sox win, 7-4)
- September 15, 1999: Rockies vs. Florida Marlins (Marlins win, 8-6)
- September 17, 1999: Rockies vs. New York Mets (Mets win, 6-5)
- September 18, 1999: Rockies vs. Los Angeles Dodgers (Dodgers win, 10-7)
- September 20, 1999: Rockies vs. Arizona Diamondbacks (Diamondbacks win, 3-2)
- September 21, 1999: Rockies vs. San Francisco Giants (Giants win, 16-5)
- September 24, 1999: Rockies vs. Florida Marlins (Marlins win, 7-4)
- September 25, 1999: Rockies vs. Colorado Springs Sky Sox (Sky Sox win, 6-3)
- September 27, 1999: Rockies vs. Arizona Diamondbacks (Diamondbacks win, 9-5)
- September 28, 1999: Rockies vs. San Francisco Giants (Giants win, 4-3)
- September 29, 1999: Rockies vs. Colorado Springs Sky Sox (Sky Sox win, 5-4)
- September 30, 1999: Rockies vs. Arizona Diamondbacks (Diamondbacks win, 8-7)
The Rockies had a good month of September, winning 13 games and losing 7. They finished the season with a record of 91-71. Updated: December 14, 2025 at 6:30 PM