Offseason
- December 2, 2003: Juan Uribe was traded by the Colorado Rockies to the Chicago White Sox for Aaron Miles.
- December 11, 2003: Vinny Castilla was signed as a Free Agent by the Colorado Rockies.
- December 14, 2003: Justin Speier was traded by the Colorado Rockies as part of a 3-team deal to the Toronto Blue Jays for a player to be named later from Toronto and Joe Kennedy from the Tampa Bay Devil Rays. The Toronto Blue Jays sent Sandy Nin (minors) (December 15, 2003) to the Colorado Rockies to complete the trade.
- January 9, 2004: Jeromy Burnitz and Royce Clayton were signed as Free Agents by the Colorado Rockies.
- March 8, 2004: Shawn Estes was signed as a Free Agent by the Colorado Rockies.
Read more about this topic: 2004 Colorado Rockies Season