Elections & Voter Information

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2026 Special Municipal Election - Tuesday, November 3, 2026

The Special Election will be in conjunction with the Adams County coordinated mail ballot election.

Proposed Charter Amendment

4.5 – Vacancy

D. The purpose of this subsection is to prevent conflicts between holding office on the Council and campaigning for another elected office during an active term on the Council. Any person serving as Councilmember or Mayor shall be deemed to have vacated and resigned from such office upon formally declaring candidacy for any elected office other than Councilmember or Mayor. For purposes of this subsection, “formally declaring candidacy” includes filing a candidate affidavit, nominating petition, statement of candidacy or paperwork to create or designate a candidate committee for the purpose of seeking elected office, publicly announcing one’s candidacy where such announcement is accompanied by any filing required under Colorado election law, or taking any other official action required by federal, state, county, municipal or special district law to qualify as a candidate for elected office. Notwithstanding any provision to the contrary in this section, the office of Councilmember or Mayor, as applicable, shall be deemed vacant immediately without further action required by the Council upon the Councilmember or Mayor formally declaring candidacy for any elected office other than Councilmember or Mayor. The Mayor or Councilmember shall, within 10 days, notify the City Clerk upon formally declaring candidacy for any such elected office.

Proposed Charter Amendment Question

“Shall Section 4.5 of the Thornton City Charter be amended to require that any member of the Thornton City Council, including the Mayor, shall be deemed to have resigned and vacated the member’s office upon formally declaring candidacy for any elected office other than Thornton City Council member or Mayor, including by filing a candidate affidavit, petition, or other official candidacy document required by law?”

_____Yes _____No

2027 Regular Municipal Election Information

The Mayor and City Councilmembers are elected for four-year terms in Regular Municipal Elections, with one Councilmember elected from each of the four wards every two years and the Mayor elected every four years.

Regular Municipal Elections are held on the first Tuesday in November in odd-numbered years. The 2027 Municipal Election will be held on Tuesday, November 2, 2027. The 2027 Candidate Guidelines, which outline the requirements of candidacy, will be made available on this website by March of 2027 for those interested in running for City Council. In addition, a Candidate Briefing will be scheduled in June. Specific date, time, and location information will be posted as soon as determined.

The City Clerk’s office is responsible for conducting the Municipal Elections, as well as assisting Adams County with registering citizens to vote.

Voter Registration Information

Voters in City elections are registered electors who live within the Thornton City limits. Individuals may register to vote online through the Secretary of State's website, visiting the Adams County Election Office, City Clerk's Office, or Motor Vehicle offices.

Citizens who are registering for the first time in Colorado must be living in Colorado for 22 days immediately before the election in which the individual intends to vote and must provide a valid Colorado driver's license or Colorado identification card. Identification requirements for first time voters can be found by going to the Secretary of State's website and clicking on the words "Acceptable forms of ID."

For questions relating to voter registration or registration status, visit Secretary of State's website, contact the Adams County Election Office at 720-523-6500, or the City Clerk's Office at 303-538-7230.

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