| Election Date | State | Title | Outcome |
|---|---|---|---|
| Nov. 4, 2008 | Colorado | Amendment 48: An amendment to the Colorado constitution defining the term "person" to include any human being from the moment of fertilization as "person" is used in those provisions of the Colorado constitution relating to inalienable rights, equality of justice, and due process of law. | Failed |
| Nov. 2, 2010 | Colorado | Amendment 62: Application of the Term Person | Failed |
| Nov. 3, 2020 | Colorado | Proposition 115: Prohibit Abortions After 22 Weeks | Failed |
| Nov. 5, 2024 | Colorado | Amendment 79: Right to Abortion and Health Insurance Coverage Initiative | Passed |