Colorado Ballot Measures 2026: All 14 Amendments and Propositions on the Nov. 3 Ballot

Colorado voters will decide 14 statewide ballot measures on Tuesday, Nov. 3, 2026, according to the Colorado Legislative Council’s 2026 State Ballot Information Booklet, known as the Blue Book (Research Publication No. 842, Sept. 10, 2026). Six are constitutional amendments, seven are statutes and one, Amendment 87, changes both the constitution and state law. The table below puts all 14 in one place, followed by the rules for returning a ballot, which are tight this weekend.

Return your Colorado ballot by 7 p.m. Tuesday

Today is Saturday, Oct. 31, and mailing a ballot is no longer a safe choice. The Colorado Secretary of State’s mail ballot questions page says a ballot “must be received by the county clerk and recorder no later than 7:00 PM on Election Day,” and that “Postmarks do not count.” The state has not published a recommended last mail date, so this story does not give one.

• Drop it off. Take the signed ballot to a drop box or a voter service and polling center in your county before 7 p.m. Mountain Time (MT) on Tue., Nov. 3. That is 9 p.m. Eastern Time (ET).
• Vote in person. Voter service and polling centers are open 7 a.m. to 7 p.m. on Election Day, per the Blue Book cover.
• Check your county. Drop box rules come from each county. As one example, Larimer County says its drop boxes are open 24 hours a day until 7 p.m. on Nov. 3. Your own county clerk’s page has your locations.

Colorado mailed ballots between Oct. 2 and Oct. 9, per the Blue Book. Online and mail voter registration closed on Mon., Oct. 26, the eighth day before Election Day. Registration is still possible in person at a voter service and polling center through Election Day, according to the Secretary of State’s voter registration questions page.

The 14 Colorado measures at a glance

Titles below are shortened from the Blue Book. A yes vote on any of them approves the change described; a no vote leaves current law in place.

Measure	Type	Vote needed	What a yes vote does
Amendment 81	Constitutional (initiative)	55%	Requires law enforcement to notify federal immigration authorities after certain charges if the person is not confirmed to be lawfully present
Amendment 82	Constitutional	55%	Adds a right to buy and sell natural gas for homes and businesses
Amendment 83	Constitutional	55%	Adds a right to hunt and fish
Amendment 84	Constitutional	55%	Requires voters to include ID information with a mail ballot: the last four digits of a Social Security number or a Colorado driver’s license or ID number
Amendment 85	Constitutional	55%	Requires ballot titles in plain language at an eighth-grade reading level
Amendment 86	Constitutional	55%	Requires an independent commission to approve new congressional districts drawn outside a scheduled redistricting year
Amendment 87	Constitution and statute (initiative)	Majority	Creates a graduated state income tax
Proposition NN	Statute (legislative referral, SB 26-135)	Majority	Lets the state keep some Taxpayer’s Bill of Rights (TABOR) refunds for K-12 education and other purposes
Proposition 132	Statute	Majority	Increases penalties for fentanyl
Proposition 133	Statute	Majority	Sets life sentences for child sex trafficking and expands the offense
Proposition 134	Statute	Majority	Sets rules for participation in sex-based school and collegiate sports
Proposition 135	Statute	Majority	Prohibits surgery on minors to alter biological sex characteristics
Proposition 136	Statute	Majority	Caps the state income tax rate at 4.4%
Proposition 137	Statute	Majority	Directs sporting goods sales tax revenue to conservation

Sources: Colorado Legislative Council, 2026 Blue Book; Colorado Secretary of State measures list. The Blue Book gives the vote threshold for the amendments, Amendment 87, Proposition NN and Proposition 132; for Propositions 133 to 137 the “majority” entry follows from their being statutes, since the 55% rule applies to constitutional amendments.

What does the 55% rule mean for Colorado amendments?

Under the Blue Book, a constitutional amendment needs at least 55% of the votes cast on it to pass. The exception is an amendment that only repeals language, which needs a simple majority. Statutes are decided by a majority. Amendments 81 to 86 fall under the 55% rule. Amendment 87 is different because it changes both the constitution and state law, and the Blue Book quick guide lists it as “Passes with a majority vote.”

Is Amendment 87 still on the ballot?

Yes. The Secretary of State said on Oct. 30, 2026, that the Colorado Supreme Court “upheld the Denver District Court’s ruling on Amendment 87.” The dispute concerned whether the measure had enough valid petition signatures, and the ruling leaves it on the ballot.

Amendment 84 and voter ID on mail ballots

Amendment 84 would write an ID requirement for mail ballots into the state constitution: voters would include the last four digits of a Social Security number or a Colorado driver’s license or ID number. Voter ID is the subject of other states’ ballot questions too; see our guide to voter ID on the ballot in North Carolina, Ohio, Arizona and Nevada.

Which Colorado offices are on the ballot?

The Secretary of State’s list of offices up for election in 2026 includes these statewide and federal contests:

• Governor and Lieutenant Governor
• Secretary of State
• State Treasurer
• Attorney General
• U.S. Senate
• U.S. House, districts 1 through 8

This list names offices only; your ballot shows the candidates.

How does Colorado compare with other states?

Other states have their own ballot question lists and return rules. Arizona has eight propositions, all referred by its Legislature: see Arizona propositions 2026. California has its own list in the California propositions guide. For every state’s return deadline, use mail ballot deadlines by state.

Where to find the full text of each Colorado measure

The Blue Book from the Colorado Legislative Council is the official ballot booklet, and the Secretary of State keeps the official list of 2026 ballot measures. This story gives only the descriptions in the table and does not weigh the measures.

Print the checklist below and mark Tuesday on the November 2026 printable calendar or a printable weekly planner.