The Green Party of Colorado (GPCO) is the affiliate of the Green Party of the United States for the state of Colorado.

The Green Party of Colorado first attempted to qualify for statewide ballot status in 1994.

[3] In 2000, the Green Party of Colorado hosted the 2000 national convention of the Green Party of the United States in Denver.

In the 2006 mid-term elections, Tom Kelly running for U.S. House of Representatives District 1 received 20.2% of the vote, the best finish of any Green running for Congress in 2006.

[4] In 2016, the party's candidate for president was Dr. Jill Stein.