Cummings made 28 appearances for Colorado in 2012, tallying six goals and two assists.The Jamaican international totaled 39 goals and 27 assists in his six-year career with the Rapids.Cummings was named to the 2011 MLS All-Star team and scored a career-high 14 goals in 2010.
"I have always like Omar," Dynamo head coach Dominic Kinnear said."He is a good player with good pace.He is someone who knows the league well. We were in an unfortunate situation with Calen Carr's injury, but Omar is a player who can come in and help us stretch the field."
The 30-year-old striker has also been a staple of the Jamaican national team, making 28 appearances for the Reggae Boyz with seven goals scored.Cummings is part of the squad that has advanced to the final round of CONCACAF World Cup qualifying, playing in four of six games.
He also competed with the Rapids during the 2011/12 CONCACAF Champions League, scoring one goal in five outings.
In addition to the acquisition of Cummings, the Dynamo announced that it has waived forward Colin Rolfe. Houston's first round draft pick in the 2012 MLS SuperDraft, Rolfe did not feature for the Dynamo last season.
Houston will face Mexico's Santos in a two-leg Champions League quarterfinal series on March 5 and 13.