More than 1.5 million Coloradans have already cast their ballots in the 2026 midterm elections. If you’re eligible to vote, it’s not too late to join them — even if you’re not yet registered.

On the ballot are elections for U.S. senator, eight congressional representatives, governor and three other statewide executive offices, all 65 state House seats, 18 state Senate seats, 14 statewide ballot measures and countless other races and issues at the local level.

See what’s on your ballot using Newsline’s build-your-own-ballot tool.

Read more about the candidates and ballot measures in Newsline’s 2026 voter guide.

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With control of Congress during President Donald Trump’s final two years up for grabs, Colorado’s four incumbent House Republicans all face serious challenges from Democratic opponents. At the state level, Democrats are hoping to extend their recent run of total control of Colorado government and capture supermajorities in the state Legislature.

If you’re an active, registered voter who received a ballot in the mail, it’s too late to return it by mailing it back. Instead, place it in a secure ballot drop box or take it to a voter service and polling center. You can enter your address and find a list of nearby drop boxes and polling places on the Colorado secretary of state’s website.

If you are a registered voter but did not receive a ballot, you can still vote by visiting an in-person polling center before 7 p.m. You can also choose to vote in person even if you received a mail ballot and have not yet returned it. Coloradans who vote in person must provide identification; a list of valid forms of ID is available on the secretary of state’s website.

Colorado has same-day voter registration for all eligible voters, so it’s not too late to register to vote and cast your ballot in today’s election. You can register online or by visiting a polling center before 7 p.m.

Not sure if you’re registered? Coloradans can check their voter registration status at the secretary of state’s website.

Know your rights

Nationwide, Trump and his allies have launched unprecedented efforts to influence the 2026 midterms, including preemptive legal challenges against some states, amid growing fears that the administration could interfere with or refuse to accept the results of the election.

In Colorado, monitors from Trump’s Justice Department are expected outside some voting locations in Adams County, but they will not be allowed inside, after the department declined terms set by Colorado officials that would have restricted their activities inside election buildings. Adams County includes the more Democratic-leaning half of the battleground 8th Congressional District, and the plan to send monitors there raised alarm bells among the Colorado’s Democratic congressional delegation.

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Colorado county clerks, who administer state elections at the local level, said last week that they’re ready to “go to the mattresses to make sure the voices of the voters are heard,” and Secretary of State Jena Griswold said in a press conference Monday that election officials are “standing strong” against any threats of federal interference.

“I don’t want Coloradans to hear that they should be scared. They should absolutely not be scared. They should go cast their ballot,” Griswold said.

State laws aimed at protecting the right to vote include a prohibition on electioneering within 100 feet of a drop box or voting center, and a prohibition on the open or concealed carrying of a gun within 100 feet of drop box, voting center or ballot processing facility, except by law enforcement or uniformed security guards “acting within the scope of their duties.”

Voter intimidation or harassment can be reported to local law enforcement or the Colorado attorney general’s office, state elections officials said.