75th Colorado General Assembly

• November 12, 2024: One week after reelection, Senator Chris Hansen resigned to serve as CEO of the La Plata Electrical Association.^[4]
• November 21, 2024: Senator Janet Buckner announces her resignation, effective January 8.^[5]
• January 6, 2025: Colorado Representative Iman Jodeh is selected to represent the 29th Senate district by vacancy committee, replacing Buckner.^[6][5]
• January 7, 2025: Matthew Ball is selected by vacancy committee to represent the 31st Senate district, replacing Hansen.
• February 17, 2025: Senator Sonya Jaquez Lewis resigns amid an ethics investigation.^[7]
• March 18, 2025: Katie Wallace is selected by vacancy committee to replace Jaquez Lewis in representing the 17th Senate district.^[8]
• June 9, 2025, Senate Minority Leader Paul Lundeen announced his resignation from the Senate.^[9]
• June 30, 2025: Lynda Zamora Wilson is selected by vacancy committee to replace Lundeen in representing the 9th Senate district.^[10]
• August 21, 2025: Representative Ryan Armagost resigned from the House.^[11] Armagost had previously announced his resignation, due to occur on September 1st.^[12]

• November 8, 2024:
  • Former Senate President Pro Tempore James Coleman is elected to serve as Senate President, replacing outgoing term-limited President Steve Fenberg. Coleman's election is not official until a formal vote may occur on the first day of the 75th General Assembly.^[13]
  • Senator Lisa Cutter is elected to serve as Senate majority leader, replacing Senator Faith Winter, who did not seek reelection for the position.^[13]
  • Senator Dafna Michaelson Jenet is elected to serve as Senate Pro Tempore.^[13]
  • Senator-Elect Judy Amabile is appointed to serve on the coveted Joint Budget Committee, replacing Rachel Zenzinger, who was term-limited.^[13]
  • Senators Nick Hinrichsen and Dylan Roberts are elected to serve as Senate majority caucus co-chairs, replacing Senator Janet Buckner, who did not seek reelection to the position.^[13]
  • Representative Anthony Hartsook is elected to serve as House minority caucus chair, replacing Representative Mary Bradfield, who did not seek reelection to the position.^[14]
• November 11, 2024:
  • Former Senate Minority whip Senator Cleave Simpson is elected to serve as Senate assistant minority leader, replacing term-limited Bob Gardner.^[15]
  • Senator Janice Rich is elected to serve as Senate minority whip.^[15]
  • Senator Byron Pelton is elected to serve as Senate minority caucus chair, replacing term-limited Jim Smallwood.^[15]
  • Representative Matthew Martinez is elected to serve as House majority co-whip along with then-Representative Iman Jodeh.^[16]
  • Representative Junie Joseph is elected to serve as House majority co-caucus chair, replacing Representative Brianna Titone, who did not seek reelection to the position.^[16]
• December 9, 2024: Representative Andrew Boesenecker is appointed by Speaker Julie McCluskie to serve as Speaker Pro Tempore, replacing Representative Chris Kennedy, who was term limited.^[17]
• January 10, 2025: Representative Elizabeth Velasco is elected to serve as House majority co-whip, replacing Iman Jodeh who resigned from her House seat after being appointed by vacancy committee to represent the 29th district in the Senate.^[18]
• June 9, 2025: Senate Minority Leader Paul Lundeen resigns from his position as Senate Minority Leader and as state Senator.^[9]
• June 12, 2025: Assistant Senate Minority Leader Cleave Simpson is elected to serve as Senate Minority Leader following Paul Lundeen's resignation on June 9. Senator Lisa Frizell is elected to replace Simpson as Assistant Senate Minority Leader.^[19]
• July 8, 2025: Representative Carlos Barron is elected House Minority Whip.^[20] Former whip, Ryan Armagost, announced his resignation from the role on July 1, and also announced he would resign from the House of Representatives on September 1.^[21]

Notable legislative topics during the 75th General Assembly include workers' rights, gun regulation, and affordability. As the first regular session of the 75th General Assembly is still ongoing, most bills are still awaiting action.

The following bills have been signed into law by Colorado Governor Jared Polis.

• SB 25-003 - Bans the sale of specific semi-automatic firearms unless buyers pass a firearm safety training course.^[22][23] Sponsored by Senators Tom Sullivan and Julie Gonzales, as well as Representatives Andrew Boesenecker and Meg Froelich.^[24]
• HB25-1040 - Statutorily adds nuclear energy to the list of clean energy sources. Meant to encourage the development of nuclear energy in Colorado. Sponsored by Senators Larry Liston and Dylan Roberts, as well as Representatives Ty Winter and Alex Valdez.^[25]
• HB25-1005 - Creates tax incentives for film festivals. Sponsors stated the objective of the bill was to lure the Sundance Film Festival to the state.^[26] Sponsored by Senators Mark Baisley and Judy Amabile, as well as Representatives Monica Duran and Brianna Titone.^[27]
• SB25-014 - Repeals the constitutional ban on same-sex marriage in Colorado. Sponsored by Senator Jessie Danielson, as well as Representatives Lorena Garcia and Brianna Titone.^[28]

The following bills were vetoed by Colorado Governor Jared Polis.

• SB 25-086 - If enacted, the bill would have obligated social media platforms to more actively monitor their sites and ban users who breached their terms of service or used the platforms to break state laws. It also would have mandated improved cooperation with law enforcement. The Senate overrode the Governor's veto, but the House postponed the bill to beyond the end of the legislative session, effectively sustaining the veto.^[29][30]
• SB 25-027 - If enacted, the bill would have lengthened the amount of time a records custodian has to respond to a CORA request, with the exception of requests submitted by journalists.^[31][32]

The following bills were not passed out of the legislature.

• SB25-201 - Would have required the implementation of age verification for pornographic websites.^[33] The bill was intentionally shelved on the sponsors' request in the Senate.^[34] Sponsored by Senators Paul Lundeen and Lindsey Daugherty, as well as Representatives Mandy Lindsay, and Meghan Lukens.