| Election Date | State | Title | Outcome |
|---|---|---|---|
| Nov. 4, 2008 | Colorado | Amendment 58: Severance Taxes on the Oil and Natural Gas Industry | Failed |
| Nov. 3, 2020 | Colorado | Proposition 114: Reintroduction and Management of Gray Wolves | Passed |
| Nov. 5, 2024 | Colorado | Proposition 127: Prohibit Hunting of Mountain Lion, Bobcat, and Lynx | Failed |
| Nov. 5, 2024 | Colorado | Proposition 129: Establish Qualifications and Registration for Veterinary Professional Associate | Passed |
| Election Date | State | Title | Outcome |
|---|---|---|---|
| Nov. 4, 2008 | Colorado | Amendment 46: Discrimination and Preferential Treatment by the State | Failed |
| Nov. 8, 2016 | Colorado | Amendment T: No Exception to Involuntary Servitude Prohibition | Failed |
| Nov. 6, 2018 | Colorado | Amendment A: Prohibit Slavery and Involuntary Servitude in All Circumstances | Passed |
| Nov. 3, 2020 | Colorado | Amendment 76: Citizenship Qualification of Electors | Passed |
| Election Date | State | Title | Outcome |
|---|---|---|---|
| Nov. 4, 2008 | Colorado | Referendum N: Elimination of Obsolete Constitutional Provisions Regarding Intoxicating Liquor | Passed |
| Nov. 8, 2022 | Colorado | Initiative 58 - Proposition 122: Colorado Decriminalization and Regulated Access Program for Certain Psychedelic Plants and Fungi Initiative | Passed |
| Nov. 3, 2026 | Colorado | Initiative 85: Colorado Penalties for Fentanyl Sale and Possession Initiative | Pending |
| Election Date | State | Title | Outcome |
|---|---|---|---|
| Nov. 5, 2024 | Colorado | Proposition KK: Firearms & Ammunition Excise Tax | Passed |
| Election Date | State | Title | Outcome |
|---|---|---|---|
| Nov. 3, 2026 | Colorado | Initiative 95: Colorado Notification of U.S. Department of Homeland Security for Certain Criminal Charges and Immigration Status Initiative | Pending |
| Election Date | State | Title | Outcome |
|---|---|---|---|
| Nov. 4, 2008 | Colorado | Amendment 46: Discrimination and Preferential Treatment by the State | Failed |
| Nov. 3, 2026 | Colorado | Initiative 110: Colorado Prohibit Surgeries for Treatment in Response to Minors' Perception of Sex or Gender Measure | Pending |
| Nov. 3, 2026 | Colorado | Initiative 109: Colorado Sex Requirement for School and College Sports Initiative | Pending |