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Election Information

2020 March Presidential Primary, June Primary, and General Elections – Dates & Details

Colorado Presidential Primary — March 3, 2020

Colorado will hold its first Presidential Primary Election in two decades on March 3, 2020 – Super Tuesday! Political parties still hold party caucuses in March (check your local party website) and Colorado will still have a primary for statewide and local candidates in June. But ballots for the stand-alone Presidential Primary are mailed to voters beginning February 10. Here is what you need to know to participate:

  • Presidential primaries in Colorado are only held by the Democratic and Republican Parties. You must be registered as a Democrat, Republican, or Unaffiliated to participate.
  • Registered Democrats will receive only the Democratic Party ballot. Registered Republicans will receive only the Republican Party ballot.
  • Unaffiliated voters will be mailed both party ballots but can only vote and return one.
  • ***NEW*** 17-year-olds who will turn 18-years-old by the General Election, Tuesday, November 3, 2020 – Can now VOTE in Primaries!
  • There is no registration deadline. You can register and vote up to and including Election Day. Register online by February 24 to have a mail ballot sent to you. After the 24th, you can visit a Voter Service Center to register & vote in-person.
  • Replacement Ballots – February 24 is the deadline for requesting a new mail ballot be sent to you. If you damaged your ballot and need a new one, call the Elections Office at 303-413-7740 between 8 a.m. – 4:30 p.m. (Monday-Friday) to request a new one. If you did not receive a ballot, call us to verify your address and request a replacement ballot. After February 24, you can visit any Voter Service Center to request a ballot in-person.
  • Complete Ballot ContentEnglish: Democratic Sample Ballot or Republican Sample Ballot; Spanish: Democratic Sample Ballot or Republican Sample Ballot
    • Note: There are no certified write-in candidates for either party for president.
    • Note: Ballot content was finalized on January 3. Candidates who withdrew after this date will still have their name listed on the ballot.
    • As of late Election Day morning, March 3, four candidates have officially withdrawn from the 2020 Democratic Presidential Primary Election in Colorado: Senator Michael Bennet, Mayor Pete Buttigieg, Congressman John Delaney, and Senator Amy Klobuchar. Votes for these four candidates will not be counted.
    • Note that even though additional candidates have publicly announced their withdrawal/suspension in the media or other places, votes must be counted for any candidate that has not filed the appropriate paperwork in Colorado.
  • Unaffiliated Voter Frequently Asked Questions
  • Election Information in Spanish (Información para votantes hispanohablantes)

Key Dates & Events:

  • Saturday, Jan 18 – Ballots mailed/transmitted to overseas and military (UOCAVA) voters.
  • Monday, Feb 3 – Last day for voters who are affiliated with a political party to change or withdraw their affiliation if they wish to vote in a different party’s primary election for the March 3 Presidential Primary Election. It is also the last day for Unaffiliated voters to specify in their voter registration a ballot preference (optional). Otherwise, they will receive both party ballots, but can only vote and return one.
  • Monday, Feb 10 – Ballots mailed to all Boulder County voters (non-overseas voters).
  • Thursday, Feb 20 – 5:30 p.m. – Sanitas Brewing in Boulder – Free & open to the public. Click here to RSVP. Presentation on the upcoming 3 elections – Presidential Primary Election, June 30 Primary, and General Election plus information on election security, voter stats, and more. Presentation will likely be 30-45 minutes with questions. Snacks and non-alcoholic beverages served. Beers for purchase.
  • Monday, Feb 24 – Last day to register and still be mailed a ballot / last day to request a replacement ballot be mailed to you. Note: Colorado DOES NOT have a registration deadline. Eligible voters can register and vote on the same day at any Voter Service Center. See eligibility requirements.
  • Monday, Feb 24 – Voter Service Centers open.
  • Friday, Feb 28 – 12:30pm – 2 p.m. Election Open House & Ballot Processing Center Tours (tours run every 30 minutes). Click here to RSVP.
  • Monday, March 2 – 4:30pm – 6:00 p.m. Election Open House & Ballot Processing Center Tours (tours run every 30 minutes). Click here to RSVP.
  • Tuesday, March 3 – Presidential Primary – Last day to vote
  • Saturday, March 14 – 9:30 a.m. – 4:30 p.m. (or until completed). Post-Election Canvass & Risk-Limiting Audit (RLA). Open to the public.* See link for details. (*Due to current public health advisories regarding COVID-19, we recommend that you refrain from attending this audit in-person if you are currently ill, have recently been ill, or have recently traveled).
  • Tuesday, March 24 – 1:30 p.m (Previously scheduled for in-person, now remote. Please email for login info). Post-Election Canvass. Open to the public.

Helpful Resources & Other Information:

More information will be posted throughout the election period regarding the Presidential Primary.

Primary Election — June 30, 2020

  • Primary election for candidates for U.S. Senate, Congressional, State, and Local. Details later in spring.

General Election — November 3, 2020

  • Details will be posted after the June 30 Primary Election.

Contact Us

Elections Division


303-413-7728 (Fax)


Hours: 8 a.m. – 4:30 p.m. M-F


Boulder: 1750 33rd Street
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Longmont: 529 Coffman Street
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Lafayette: 1376 Miners Drive
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Mailing Address

1750 33rd Street, Suite 200
Boulder, CO 80301