"A presidential primary election shall be held on a Tuesday on a date designated by the governor. The date selected for the primary must be no earlier than the date the national rules of the major political parties provide for state delegations to the party's national convention to be allocated without penalty and not later than the third Tuesday in March" [CO Revised Statutes 1-4-1203].

Colorado has same-day voter registration [CTS 1-2-217.7]. Unaffiliated voters may vote in either the Democratic or Republican primary election, but not both. [CRS 1-7-201(2.3)]. Voters who are affiliated with a major political party may switch their affiliation no later than 22 days before the primary election. State law restricts participation in Party caucuses and conventions to registered Party members [CRS 1-3-101]. Unaffiliated voters are allowed to vote in a party primary without affiliating with the party [CRS 1-7-201(2.3)].

Tuesday 5 March 2024: Colorado Primary. Hours reportedly end at 7:00p MST (0200 UTC). Colorado votes mostly by mail. Delegate Pledging: Proportional Primary. Voter Eligibility: Modified Primary.

Primary (preliminary)
Included in Nationwide vote.
Estimate updated 8 March 2024 03:45p EST.

72 of 87 delegates to the Democratic National Convention are pledged to presidential contenders based on the results of the voting in today's Colorado Presidential Primary. A mandatory 15 percent threshold is required in order for a presidential contender to be pledged National Convention delegates at either the congressional district or statewide level. How the Democratic Proportional Delegate Allocation Math works.

• 47 district delegates are to be pledged proportionally to presidential contenders based on the primary results in each of the State's 7 congressional districts.
• 25 delegates are to be pledged to presidential contenders based on the primary vote statewide.
  • 16 at-large National Convention delegates
  • 9 Pledged PLEOs

Primary
Estimate updated 8 March 2024 03:45p EST.

Tuesday 5 March - Saturday 9 March 2024: Colorado Precinct Caucus. Hours reportedly begin at 2:00p MST (2100 UTC). First tier Caucuses meet in each precinct to elected delegates to the County Assemblies/Conventions.

There are two separate processes in Colorado that are dealt with simultaneously: Caucuses and conventions elect Colorado's National Delegates according the the results of the primary while assemblies designate candidates for nomination at the June Colorado state primary.

A fine point: In some counties delegates are elected from the precinct caucuses to the congressional and/or state assembly/conventions. In other counties, delegates are elected from the precinct caucuses to the county assembly/conventions and then to the congressional assembly/convention and state assembly/conventions.

Friday 8 March - Saturday 30 March 2024: County Assemblies/Conventions - held no later than 21 days after the precinct caucuses. The Assemblies/Conventions meet to elect delegates to the Congressional District and State Conventions.

Thursday 11 April 2024: Congressional District Assemblies/Conventions. National Convention district delegates are elected according to the results of the primary.

Saturday 13 April 2024: State Assembly/Convention convenes. National Convention At-large and Pledged PLEO delegates are elected according to the results of the primary.

The remaining 15 National Convention delegates consist of

• 15 Unpledged PLEO delegates:
• 6 Democratic National Committee members.
• 7 Members of Congress (2 Senators and 5 Representatives).
• 1 Governor.
• 1 Distinguished Party Leader (former DNC Chairman Roy Romer).

These 15 delegates and will go to the Democratic National Convention officially "Unpledged".