Statewide ballot measure
Proposition 135 (Initiative 110): Prohibiting surgery on minors to alter biological sex characteristics
On the November 3, 2026 ballot
- Ballot number
- Proposition 135
- Filed as
- Initiative 110
- Type of measure (Legislative Council)
- Statutory
The ballot question
Shall there be a change to the Colorado Revised Statutes modifying existing law by prohibiting surgery on a minor for the purpose of altering the minor’s biological sex characteristics, and, in connection therewith, prohibiting any health-care professional or other person from knowingly performing, prescribing, administering, or providing any surgery to a minor for the purpose of altering the minor’s biological sex characteristics and prohibiting the use of state or federal funds, Medicaid reimbursement, or insurance coverage to pay for this type of surgery?
What a vote does
- A yes vote means
- A health-care professional or other person could not knowingly perform, prescribe, administer or provide surgery to someone under 18 in response to the minor’s perception of sex or gender. State or federal funds, Medicaid reimbursements and insurance coverage could not pay for the prohibited surgery. The definition excludes treatment for people born with a medically verifiable disorder of sex development, treatment for acquired physical or chemical abnormalities, and male circumcision. The measure would apply to violations on or after January 1, 2027.
- A no vote means
- Current law would remain in effect. The measure’s surgery prohibition and payment restrictions would not take effect.
Figures from the fiscal estimate
- Takes effect: January 1, 2027
- Applies to violations on or after that date.
- Added state appropriations: $0 estimated
- September 9, 2025 estimate for fiscal years 2026–27 and 2027–28; assumes compliance. The note also describes possible small savings and fee revenue.
- Age covered: Under 18
- The measure’s definition excludes three kinds of treatment.
Legislative Council ballot analysis
Official documents
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Key dates
- October 2 to October 9: county clerks mail ballots to active voters.
- October 12: drop boxes open.
- October 26: last suggested day to return a ballot by mail.
- From October 27: return your ballot to a drop box or vote center instead of mailing it.
- November 3, 2026, Election Day: ballots are due by 7:00 p.m.
Page updated September 29, 2026