Primary Information

2018 Primary Election - June 26, 2018

Important Dates

  • May 8: Preferred date by which unaffiliated voters who would like only one ballot sent to them, select their ballot preference (see below)
  • May 29:
    • If registered with a political party, last day to change party change party affiliation if you want to switch parties
    • If registered as an unaffiliated (sometimes referred to as “independent” voter), last day to update your registration with a party preference IF you know which party’s primary you want to vote in. Otherwise, you will receive both major party ballots in the mail (Democratic and Republican) BUT may only vote and return one.
  • June 4: Ballots mailed to registered voters this week
  • June 4: 22-day Colorado residency deadline
  • June 4: In-person voting available at the Boulder office of the Clerk & Recorder
  • June 18: Last day to request a replacement mail ballot or register to vote and be sent a ballot in the mail
  • June 18: Voter Service Centers open
  • June 26: Election Day, ballots must be received by 7pm

What’s new in 2018?Choice happens with you logo

  • Unaffiliated voters are eligible to participate in the Primary Election; Active voters will automatically receive their ballot(s) in the mail
  • Unaffiliated voters who have not indicated a party ballot preference will receive two ballots, one for Democratic Party races and one for Republican Party races
    • Know which party’s ballot you would like to vote? Pick your preference now. Save time, taxpayer money and trees!Visit www.UChoose.CO.Gov to learn more about unaffiliated voters participating in primaries and to pick your ballot preference (if you are ready!)
  • Unaffiliated voters without a party preference who receive both ballots in the mail should select, vote, and return only one ballot

For more information, see Unaffiliated Voters FAQ.

Ballot Content

  • Ballot content for the state and local races for both the Democratic and Republican ballots will be posted on or after May 1.

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