Colorado

§1On the ballot

• Amendment 81: Law Enforcement Communication with Federal Immigration Authorities^1,2
  Citizen initiative · Constitutional amendment · To pass: 55% of the votes on it
• Amendment 82: Constitutional Right to Purchase and Sell Natural Gas^1,2
  Citizen initiative · Constitutional amendment · To pass: 55% of the votes on it
• Amendment 83: Constitutional Right to Hunt and Fish^1,2
  Citizen initiative · Constitutional amendment · To pass: 55% of the votes on it
• Amendment 84: Mail Ballot Voter Identification^1,2
  Citizen initiative · Constitutional amendment · To pass: 55% of the votes on it
• Amendment 85: Plain Language Ballot Titles^1,2
  Citizen initiative · Constitutional amendment · To pass: 55% of the votes on it
• Amendment 86: Requirements for Off-Cycle Congressional Redistricting^1,2
  Citizen initiative · Constitutional amendment · To pass: 55% of the votes on it
• Amendment 87: Graduated Income Tax^1,2
  Citizen initiative · Constitutional amendment · To pass: a majority of the votes on it
• Proposition NN: Keep and Spend Money for Education and Other Purposes^1,2
  Referred by the legislature · State law · To pass: a majority of the votes on it
• Proposition 132: Increase Penalties for Fentanyl Crimes^1,2
  Citizen initiative · State law · To pass: a majority of the votes on it
• Proposition 133: Penalties for Human Trafficking of a Minor^1,2
  Citizen initiative · State law · To pass: a majority of the votes on it
• Proposition 134: Male and Female Participation in School and Collegiate Sports^1,2
  Citizen initiative · State law · To pass: a majority of the votes on it
• Proposition 135: Prohibit Surgery on Minors in Response to Perception of Sex or Gender^1,2
  Citizen initiative · State law · To pass: a majority of the votes on it
• Proposition 136: Income Tax Rate Limit^1,2
  Citizen initiative · State law · To pass: a majority of the votes on it
• Proposition 137: Direct Sporting Goods Sales Tax Revenue for Conservation^1,2
  Citizen initiative · State law · To pass: a majority of the votes on it

§2Where this list comes from

The list above comes from these official sources. Researched October 27, 2026.

• Amendments and Propositions on the 2026 Ballot¹Colorado Secretary of State
• 2026 State Ballot Information Booklet (Blue Book), Research Publication No. 842²Legislative Council of the Colorado General Assembly

One of these official sources itself calls the list certified or final.

§3Notes on the research

What the research couldn’t find or confirm, in its own plain words. Nothing is left out silently.

• Ballot Issue 7A, a sales tax and debt question from the Front Range Passenger Rail District, appears on the Secretary of State's 2026 list and in the Blue Book, but only on ballots in 13 Front Range counties inside the district, so we left it out as a district measure rather than a statewide one.
• Titles are the Blue Book's headings. The Secretary of State's list uses different initiative names for some measures (for example, Initiative #95 - Law Enforcement Reporting Requirements to Federal Authorities for Amendment 81, and Initiative #234 - Plain Language Ballot Questions for Amendment 85).
• The Secretary of State's list shows no vote requirement for Amendment 87, while every other amendment is marked as needing 55 percent. The Blue Book lists Amendment 87 as passing with a majority vote but does not say why; our threshold sentence relies on the constitution's exception for amendments limited to a repeal, since the measure's only constitutional change deletes the flat-tax sentence from article X, section 20(8)(a). A reviewer should confirm this reading.
• The Colorado Constitution was read from the 2026 PDF published by the Office of Legislative Legal Services (olls.info, linked from the General Assembly's statute download page); the General Assembly's main constitution link goes to a LexisNexis site, which we did not use.