Staggered Senate
Senators serve four-year terms; about half the seats are on the ballot each election.
17 of 35 seats on the ballot; 18 holdovers (12 D, 6 R) serve until a later election.
Colorado · 2026 forecast · Mountain West region · Updated Oct 16, 2026
Colorado in 2026
Colorado elects a U.S. senator and a governor, an attorney general, a secretary of state, a treasurer, all 8 members of the U.S. House, 17 of 35 members of the State Senate and all 65 members of the House of Representatives on November 3, 2026.
On the November 3 ballot: U.S. Senate · Governor · 3 statewide offices · 8 U.S. House seats · 2 legislative chambers.
- U.S. Senate
- D 99%D 98%John Hickenlooper vs. Mark Baisley
- Governor
- D 96%D 94%Phil Weiser vs. Victor Marx
- U.S. House
- 5.7 D · 2.3 R5.5 D · 2.5 RExpected seats of 8
- Colorado State Senate
- D >99%D >99%Chance of control · 17 of 35 seats up
- Colorado House of Representatives
- D >99%D >99%Chance of control · 65 of 65 seats up
- Attorney General
- D 99%D 96%Jena Griswold vs. Michael Allen
- Secretary of State
- D 99%D 96%Amanda Gonzalez vs. James Wiley
- Treasurer
- D 99%D 97%Jeff Bridges vs. Kevin Grantham
U.S. House districts · Colorado
- Solid D
- Likely D
- Lean D
- Toss-up
- Lean R
- Likely R
- Solid R
- Projected flip (stripes: party holding it now)
Trifecta
Democratic trifecta now
Democrats hold the governorship and every legislative chamber. A trifecta is one party holding all of them.
After the election
- Dem. trifecta
- 96%
- Divided
- 5%
- Rep. trifecta
- <1%
The Democratic trifecta most likely continues (96%); 5% chance it is broken.
After the election
- Dem. trifecta
- 94%
- Divided
- 6%
- Rep. trifecta
- <1%
The Democratic trifecta most likely continues (94%); 6% chance it is broken.
Chances come from the same simulations as the races, so outcomes are correlated. A governorship or chamber not on the ballot this year keeps its current party. Source: 99chambers forecast, run 56, updated Oct 16, 2026.
Statewide races
Every race decided by the whole state. Statewide offices nationwide.
Statewide offices
Attorney General
● Jena Griswold● Michael Allen
Secretary of State
● Amanda Gonzalez● James Wiley
Treasurer
● Jeff Bridges● Kevin Grantham
Ratings
Likely D1
Columns follow the chance of winning: Toss-up 40–60%, Lean 60–80%, Likely 80–95%, Solid 95%+. The square shows who holds the seat now (■ Democrats, ■ Republicans).
The Colorado environment
The environment Colorado's governor, statewide and legislative races run in, read from their polls against what the fundamentals expect. Its federal races run in the national environment.
- National environment
- D+9.5Election Day forecast, national House vote
- Colorado state offices vs. the nation
- +0.0± 4.5 (80% range) · 0 polled state races
- Colorado state-office environment
- D+9.5In line with the nation
The polled state races behind it
No governor, statewide or legislative race in Colorado is polled yet, so its state races run at the national environment.
Over time
Each polled race's average, minus what the fundamentals expect at the national environment, in national-environment points (a dot right of center runs more Democratic than expected). Readings are weighted by poll precision and office (governor most, then other statewide races, the Senate, legislative and House races), centered on the national average and pulled toward zero, so a thinly polled state stays near the nation. Governor, statewide and legislative races use the Colorado environment in full; Senate and House races 0% of it. Each race's own polls are left out of the environment it uses.
U.S. House
8 districts. The national House forecast.
Columns follow the chance of winning: Toss-up 40–60%, Lean 60–80%, Likely 80–95%, Solid 95%+. The square shows who holds the seat now (■ Democrats, ■ Republicans). flip: projected to change parties, in the color of the party favored to gain it.
Denver
8 races
| District | Candidates | Chance of winning (D · R) | Avg. margin | Rating | Lean | Polls |
|---|---|---|---|---|---|---|
| CO-1 | ● Melat Kiros● Christy Peterson | D+64.7D+65.9 | D+59 | — | ||
| CO-2 | ● Joe NeguseINC● Kelley Dennison | D+48.7D+46.2 | D+41 | — | ||
| CO-3 | ● Dwayne Romero● Jeff HurdINC | R+3.2R+3.7 | R+10 | 1 | ||
| CO-4 | ● Eileen Laubacher● Lauren BoebertINCAlso: Douglas Mangeris (L) | R+6.3R+11.8 | R+19 | 1 | ||
| CO-5 | ● Jessica Killin● Jeff CrankINC | R+2.4R+3.8 | R+10 | 2 | ||
| CO-6 | ● Jason CrowINC● Jason Clark | D+31.7D+28.4 | D+21 | — | ||
| CO-7 | ● Brittany PettersenINC● Tim Bennett | D+24.9D+20.7 | D+15 | — | ||
| CO-8D flipD flip | ● Manny Rutinel● Gabe EvansINC | D+7.3D+7.0 | Even | 1 |
Lean: how much more Democratic (D+) or Republican (R+) the place voted for president than the nation (2024 weighted 75%, 2020 25%). Ratings follow the chance of winning: Toss-up 40–60%, Lean 60–80%, Likely 80–95%, Solid 95%+. INC = incumbent running. D flip / R flip: another party is favored (60% or more) over the party holding the seat now (hover for the chance it changes parties); Flip risk: the seat is a toss-up (40–60%).
Colorado General Assembly
Chance of control after November 3, and how each chamber's races rate.
Colorado State Senate
Dem.
>99%
Rep.
<1%
Avg. 24 D – 11 R seats · 18 for control · D two-thirds supermajority 62%
Dem.
>99%
Rep.
<1%
Avg. 23 D – 12 R seats · 18 for control · D two-thirds supermajority 41%
17 of 35 seats up; 18 holdovers.
Full forecastColorado State Senate ratings
1 seat projected to flip: 1 R→D.
1 seat projected to flip: 1 R→D. 1 more is a toss-up that could change parties (flip risk).
Columns follow the chance of winning: Toss-up 40–60%, Lean 60–80%, Likely 80–95%, Solid 95%+. The square shows who holds the seat now (■ Democrats, ■ Republicans). flip: projected to change parties, in the color of the party favored to gain it. risk: a toss-up (40–60%) that could change parties. Faded: no major-party opponent. Every race.
Colorado House of Representatives
Dem.
>99%
Rep.
<1%
Avg. 48 D – 17 R seats · 33 for control · D two-thirds supermajority 97%
Dem.
>99%
Rep.
<1%
Avg. 46 D – 19 R seats · 33 for control · D two-thirds supermajority 84%
Colorado House of Representatives ratings
4 seats projected to flip: 4 R→D.
4 seats projected to flip: 4 R→D.
Columns follow the chance of winning: Toss-up 40–60%, Lean 60–80%, Likely 80–95%, Solid 95%+. The square shows who holds the seat now (■ Democrats, ■ Republicans). flip: projected to change parties, in the color of the party favored to gain it. Faded: no major-party opponent. Every race.
Closest legislative races
HD-50Tommy ButlerRyan GonzalezD flipD flip68%Dem.67%Dem. SD-30Kevin LeungJohn CarsonD flipD flip74%Dem.76%Dem. HD-21Michelle TweedBrenda Miller74%Rep.84%Rep. HD-39Christian SchilderBrandi Bradley76%Rep.70%Rep. HD-44Richard BownessAnthony Hartsook76%Rep.70%Rep. HD-15Jeff K. LivingstonPricella Tiegen77%Rep.83%Rep.
How Colorado votes
Election rules that differ from the usual party primary and plurality win.