2018 Colorado House of Representatives election

The 2018 Colorado House of Representatives elections took place as part of the biennial United States elections. Colorado voters elected state representatives in all 65 of the state house's districts. State representatives serve two-year terms in the Colorado House of Representatives. The Colorado Reapportionment Commission provides a statewide map of the state House here, and individual district maps are available from the U.S. Census here.

A primary election on June 26, 2018, determined which candidates appear on the November 6 general election ballot. Primary election results can be obtained from the Colorado Secretary of State's website.

Following the 2016 state House elections, Democrats maintained effective control of the House with 37 members. However, on March 2, 2018, immediately before being expelled from the legislature in the face of sexual harassment allegations, State Representative Steve Lebsock switched parties to Republican. This forced his replacement to be a fellow Republican. Due to these acts, Republican seats increased from 28 to 29 (Republican Alex Winkler was seated on March 23, 2018, to represent District 34) and Democratic seats decreased from 37 to 36 by election day 2018.

On election day, Democrats expanded their majority by 5 seats, as the party also swept all statewide elections in the state. To claim control of the chamber from Democrats, the Republicans would have needed to net 4 House seats.

Summary of Results
Source:

Term-limited incumbents
Five Democratic incumbents are term-limited and prohibited from seeking a fifth term.
 * Dan Pabon (D), District 4
 * Crisanta Duran (D), District 5
 * Pete Lee (D), District 18
 * Dave Young (D), District 50
 * Millie Hamner (D), District 61

Retiring incumbents

 * Mike Foote (D), District 12
 * Paul Lundeen (R), District 19 (ran for state senate)
 * Justin Everett (R), District 22 (ran for treasurer)
 * Jessie Danielson (D), District 24 (ran for state senate)
 * Brittany Pettersen (D), District 28 (ran for state senate)
 * Joseph Salazar (D), District 31 (ran for attorney general)
 * Faith Winter (D), District 35 (ran for state senate)
 * Polly Lawrence (R), District 39 (ran for treasurer)
 * Yeulin Willett (R), District 54
 * Dan Thurlow (R), District 55 (ran for state senate)
 * Jon Becker (R), District 65

Eliminated at convention

 * Paul Rosenthal (D), District 9

Closest races
Seats where the margin of victory was under 10%:
 *  gain
 * District 47, 1.00% gain
 * District 25, 5.48% gain
 *  gain
 * District 43, 8.76%
 *  gain
 * District 43, 8.76%
 * District 43, 8.76%

District 62

 * The Colorado Secretary of State's website does not report any votes for the Republicans in the 62nd House district Primary election.