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Colorado's 4th Congressional District election, 2026 (June 30 Republican primary)

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← 2024
Colorado's 4th Congressional District
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Democratic primary
Republican primary
General election
Election details
Filing deadline: March 18, 2026
Primary: June 30, 2026
General: November 3, 2026
How to vote
Poll times:

7 a.m. to 7 p.m.
Voting in Colorado

Race ratings
Cook Political Report: Solid Republican
DDHQ and The Hill: Pending
Inside Elections: Solid Republican
Sabato's Crystal Ball: Safe Republican
Ballotpedia analysis
U.S. Senate battlegrounds
U.S. House battlegrounds
Federal and state primary competitiveness
Ballotpedia's Election Analysis Hub, 2026
See also
Colorado's 4th Congressional District
U.S. Senate • 1st • 2nd • 3rd • 4th • 5th • 6th • 7th • 8th
Colorado elections, 2026
U.S. Congress elections, 2026
U.S. Senate elections, 2026
U.S. House elections, 2026

A Republican Party primary takes place on June 30, 2026, in Colorado's 4th Congressional District to determine which Republican candidate will run in the district's general election on November 3, 2026.

Candidate filing deadline Primary election General election
March 18, 2026
June 30, 2026
November 3, 2026



A primary election is an election in which registered voters select a candidate that they believe should be a political party's candidate for elected office to run in the general election. They are also used to choose convention delegates and party leaders. Primaries are state-level and local-level elections that take place prior to a general election.

Colorado utilizes a semi-closed primary system. According to Section 1-7-201 of the Colorado Revised Statutes, "An eligible unaffiliated elector, including a preregistrant who is eligible under section 1-2-101 (2)(c), is entitled to vote in the primary election of a major political party without affiliating with that political party."[1][2]

For information about which offices are nominated via primary election, see this article.

This page focuses on Colorado's 4th Congressional District Republican primary. For more in-depth information on the district's Democratic primary and the general election, see the following pages:

Candidates and election results

Note: The following list of candidates is unofficial. The filing deadline for this election has passed, and Ballotpedia is working to update this page with the official candidate list. This note will be removed once the official candidate list has been added.

Republican primary election

Republican primary for U.S. House Colorado District 4

Incumbent Lauren Boebert, Eric Phelan, and Eric San Felipe are running in the Republican primary for U.S. House Colorado District 4 on June 30, 2026.

Candidate
Image of Lauren Boebert
Lauren Boebert
Image of Eric Phelan
Eric Phelan Candidate Connection
Silhouette Placeholder Image.png
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Eric San Felipe

Incumbents are bolded and underlined.

Candidate Connection = candidate completed the Ballotpedia Candidate Connection survey.
If you are a candidate and would like to tell readers and voters more about why they should vote for you, complete the Ballotpedia Candidate Connection Survey.

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Candidate profiles

This section includes candidate profiles that may be created in one of two ways: either the candidate completed Ballotpedia's Candidate Connection survey, or Ballotpedia staff may compile a profile based on campaign websites, advertisements, and public statements after identifying the candidate as noteworthy. For more on how we select candidates to include, click here.

Eric Phelan

Image of Eric Phelan

Website

Party: Republican Party

Incumbent: No

Submitted Biography:  "Eric Phelan is a Colorado-based IT and security professional with 17 years of experience serving businesses, schools, and local governments. A cofounder and Chief Operations Officer of Code Red Audits, LLC, he has worked extensively in rural communities across Colorado’s Fourth District, partnering with more than 60 school districts and numerous municipalities. A University of Colorado Boulder graduate, Phelan brings a systems-focused approach to governance centered on accountability, fiscal discipline, and measurable results. He is running for the United States House of Representatives to restore functional leadership and deliver practical solutions that lower costs and strengthen communities."

Key Messages

To read this candidate's full survey responses, click here.

Eric Phelan supports a “Sunset & Review” system to restore accountability in federal spending. Every taxpayer-funded program would be required to include an expiration date and undergo periodic independent review to justify its continuation. This ensures Congress regularly evaluates whether programs still work, eliminates waste and duplication, and forces transparent votes on whether to renew, reform, or end federal initiatives. "No program should exist forever without proving it still serves the American people."

Eric Phelan proposes a long-term structural reform to address healthcare affordability and workforce shortages by expanding medical education pipelines, reducing administrative costs, and aligning federal healthcare spending toward outcomes rather than bureaucracy. His plan focuses on lowering costs, increasing provider availability nationwide, strengthening rural healthcare access, and ensuring taxpayer dollars produce measurable improvements in patient care. “Lower costs, more doctors, better access — without sacrificing quality.”

Eric Phelan supports establishing term limits for members of Congress to encourage fresh leadership, reduce career political entrenchment, and return public service to a citizen-legislator model. Term limits would help curb long-term institutional stagnation while promoting accountability, innovation, and closer alignment with the needs of constituents. “Public office should be a period of service — not a lifetime career.”

Voting information

See also: Voting in Colorado

Election information in Colorado: June 30, 2026, election.

What is the voter registration deadline?

  • In-person: June 30, 2026
  • By mail: Postmarked by June 22, 2026
  • Online: June 22, 2026

Is absentee/mail-in voting available to all voters?

Yes

What was the absentee/mail-in ballot request deadline?

  • In-person: N/A
  • By mail: N/A by N/A
  • Online: N/A

What is the absentee/mail-in ballot return deadline?

  • In-person: June 30, 2026
  • By mail: Received by June 30, 2026

Is early voting available to all voters?

Yes

What are the early voting start and end dates?

June 22, 2026 to June 30, 2026

Are all voters required to present ID at the polls? If so, is a photo or non-photo ID required?

N/A

When are polls open on Election Day?

7:00 a.m. - 7:00 p.m. (MT)

Campaign finance

Name Party Receipts* Disbursements** Cash on hand Date
Lauren Boebert Republican Party $723,121 $663,600 $218,666 As of December 31, 2025
Eric Phelan Republican Party $0 $0 $0 Data not available***
Eric San Felipe Republican Party $0 $0 $0 Data not available***

Source: Federal Elections Commission, "Campaign finance data," 2026. This product uses the openFEC API but is not endorsed or certified by the Federal Election Commission (FEC).

* According to the FEC, "Receipts are anything of value (money, goods, services or property) received by a political committee."
** According to the FEC, a disbursement "is a purchase, payment, distribution, loan, advance, deposit or gift of money or anything of value to influence a federal election," plus other kinds of payments not made to influence a federal election.
*** Candidate either did not report any receipts or disbursements to the FEC, or Ballotpedia did not find an FEC candidate ID.

District analysis

Click the tabs below to view information about voter composition, past elections, and demographics in both the district and the state.

  • District map - A map of the district in place for the election.
  • Competitiveness - Information about the competitiveness of 2026 U.S. House elections in the state.
  • Presidential elections - Information about presidential elections in the district and the state.
  • State party control - The partisan makeup of the state's congressional delegation and state government.


Below is the district map in place for this election. Click the map below to enlarge it.

2023_01_03_co_congressional_district_04.jpg
See also: Primary election competitiveness in state and federal government, 2026
Information about competitiveness will be added here as it becomes available.

Partisan Voter Index

See also: The Cook Political Report's Partisan Voter Index

Heading into the 2026 elections, based on results from the 2024 and 2020 presidential elections, the Cook Partisan Voter Index for this district is R+9. This meant that in those two presidential elections, this district's results were 9 percentage points more Republican than the national average. This made Colorado's 4th the 141st most Republican district nationally.[3]

2024 presidential election results

The table below shows what the vote in the 2024 presidential election was in this district. The presidential election data was compiled by The Downballot.

2024 presidential results in Colorado's 4th Congressional District
Kamala Harris Democratic PartyDonald Trump Republican Party
40.0%58.0%

Presidential voting history

See also: Presidential election in Colorado, 2024

Colorado presidential election results (1900-2024)

  • 14 Democratic wins
  • 18 Republican wins
Year 1900 1904 1908 1912 1916 1920 1924 1928 1932 1936 1940 1944 1948 1952 1956 1960 1964 1968 1972 1976 1980 1984 1988 1992 1996 2000 2004 2008 2012 2016 2020 2024
Winning Party D R D D D R R R D D R R D R R R D R R R R R R D R R R D D D D D
See also: Party control of Colorado state government

Congressional delegation

The table below displays the partisan composition of Colorado's congressional delegation as of October 2025.

Congressional Partisan Breakdown from Colorado
Party U.S. Senate U.S. House Total
Democratic 2 4 6
Republican 0 4 4
Independent 0 0 0
Vacancies 0 0 0
Total 2 8 10

State executive

The table below displays the officeholders in Colorado's top four state executive offices as of October 2025.

State executive officials in Colorado, October 2025
OfficeOfficeholder
GovernorDemocratic Party Jared Polis
Lieutenant GovernorDemocratic Party Dianne Primavera
Secretary of StateDemocratic Party Jena Griswold
Attorney GeneralDemocratic Party Phil Weiser

State legislature

Colorado State Senate

Party As of March 2026
     Democratic Party 23
     Republican Party 12
     Other 0
     Vacancies 0
Total 35

Colorado House of Representatives

Party As of March 2026
     Democratic Party 43
     Republican Party 22
     Other 0
     Vacancies 0
Total 65

Trifecta control

Colorado Party Control: 1992-2025
Thirteen years of Democratic trifectas  •  Four years of Republican trifectas
Scroll left and right on the table below to view more years.

Year 92 93 94 95 96 97 98 99 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
Governor D D D D D D D R R R R R R R R D D D D D D D D D D D D D D D D D D D
Senate R R R R R R R R R D D R R D D D D D D D D D D R R R R D D D D D D D
House R R R R R R R R R R R R R D D D D D D R R D D D D D D D D D D D D D

Ballot access

The table below details filing requirements for U.S. House candidates in Colorado in the 2026 election cycle. For additional information on candidate ballot access requirements in Colorado, click here.

Filing requirements for U.S. House candidates, 2026
State Office Party Signatures required Filing fee Filing deadline Source
Colorado U.S. House Major party 10% of votes cast for the office in the last primary, or 1,500, whichever is less N/A 3/18/2026 Source
Colorado U.S. House Minor party 2.5% of votes cast for the office in the last general election, or 1,500, whichever is less N/A 3/18/2026 Source
Colorado U.S. House Unaffiliated 2.5% of votes cast for the office in the last general election, or 1,500, whichever is less N/A 7/9/2026 Source

See also

External links

Footnotes

  1. ↑ LexisNexis, "Colorado Revised Statutes § 1-7-201," accessed October 20, 2025
  2. ↑ Colorado Secretary of State, "Primary Elections FAQs," accessed October 20, 2025
  3. ↑ Cook Political Report, "2025 Cook PVI℠: District Map and List (119th Congress)," accessed July 1, 2025


Colorado's current delegation to the United States Congress
Senators
Michael Bennet (D)
John Hickenlooper (D)
Representatives
District 1
District 2
District 3
Jeff Hurd (R)
District 4
District 5
District 6
District 7
District 8
Democratic Party (6)
Republican Party (4)


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