Primary Rules

Colorado primary election and delegate rules

See Colorado primary election type, who can vote in primaries, and historical 2024 Democratic and Republican delegate allocation details.

Rule and delegate context. This page combines structured primary-rule summaries with selected state, party, national, or archive source links. Presidential delegate counts are historical 2024 cycle data.
Last reviewed: August 21, 2026. Delegate counts are historical 2024 cycle data where listed. Confirm current primary voting rules with state election officials or party materials.

Who Can Vote

Can I vote in Colorado primaries?

Primary access

Colorado is listed with an Open to Unaffiliated classification for Democratic State, Democratic Presidential, Republican Presidential, and Republican State. Unaffiliated voters may have primary ballot options, but party and contest rules still matter.

Party and office differences

Open to Unaffiliated: Democratic State, Democratic Presidential, Republican Presidential, and Republican State.

Before you vote

Primary rules can vary by party, office, and election cycle. Confirm your current ballot eligibility with state election officials, your local election office, or the relevant political party.

Delegate context

The delegate totals on this page are historical 2024 presidential cycle data. They help explain the last presidential allocation cycle but should not be treated as current-cycle delegate counts.

Primary Type

Colorado primary type breakdown

Following the passage of Propositions 107 & 108 in 2016, unaffiliated voters will receive a combined primary ballot and then may only vote in one party’s primary contest for each office. To qualify for the ballot Colorado holds closed party caucuses at which candidates who receive more than 30% of the vote proceed to the primary election.While each political...

Open to Unaffiliated
Democratic State, Democratic Presidential, Republican Presidential, and Republican State

Delegates

Historical 2024 delegate allocation

2024 Democratic Delegates

86 delegate votes

Allocation
Proportional
Threshold
15% minimum vote required

The Democratic Party uses a proportional representation system based on the results of the Presidential Preference Election (Primary) for apportioning delegates to the Democratic National Convention. In 2024, the Democratic party will send a total of 86...

2024 Republican Delegates

37 delegate votes

Allocation
Winner-Take-Most
Threshold
Not specified

The Republican Party uses a Winner-Take-Most system based on the results of the Presidential Preference Election (Primary) for apportioning delegates to the Republican National Convention. The Republican party will send a total of 37 Delegate Votes and 34...

Sources

Sources and verification links

Questions

Common questions

What type of primary does Colorado use?

Colorado is listed with the following primary type classification: Open to Unaffiliated.

Can unaffiliated voters vote in Colorado primaries?

Colorado is listed with an Open to Unaffiliated classification for Democratic State, Democratic Presidential, Republican Presidential, and Republican State. Unaffiliated voters may have primary ballot options, but party and contest rules still matter.

How many 2024 presidential delegates are listed for Colorado?

The model lists 86 Democratic delegate votes and 37 Republican delegate votes for the 2024 presidential cycle.

Are Colorado delegate totals current?

The delegate totals shown for Colorado are historical 2024 presidential cycle data where listed. Confirm current-cycle delegate plans with official party materials or state election sources.

Where can I verify Colorado primary rules?

Use state election materials, party materials, and selected reference links where available. This page links to www.sos.state.co.us -Voting In Primaries and www.ncsl.org - Primary Types.