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ColoradoJury Nullification

In Colorado the judge instructs the jury on the law and the jury decides the case on the evidence. Jurors first hear that before jury selection begins. The state constitution says that in a prosecution for libel the jury, under the direction of the court, determines the law and the fact. State law sets a jury of twelve for a felony and six for a misdemeanor. Every verdict has to be unanimous.

Yes
State constitution gives the jury a role in judging the law
Yes
Jurors are told they must follow the law
Yes
Criminal verdicts must be unanimous

Overview

Juries in Colorado

Colorado jurors are told how the work is divided before a single juror is picked. A model instruction read at the start says the case must be decided only on the evidence and on the law as the judge gives it. State law adds that the verdict has to be unanimous.

Colorado sets the size of the jury by statute. It is twelve people for a felony and six for a misdemeanor. The same statute covers what happens when a juror has to be excused after deliberations have started. How that works is in the Colorado chapter of the guide.

The Colorado constitution keeps the right to a jury trial in criminal cases and also speaks to grand juries. What it says about each is in the chapter.

The Colorado chapter

What's in the Guide for Colorado?

In the guide

Jury selection

Colorado's court rules let a judge remove a possible juror whose state of mind shows bias, unless the court is satisfied that person will decide on the evidence and the instructions. The chapter explains how that test works.

In the guide

What the judge tells you

What the opening instruction tells a Colorado jury about the evidence and the law, and why jurors hear it before selection begins.

In the guide

How the verdict works

How a unanimous verdict works in Colorado with twelve jurors or with six, and when state law lets the remaining jurors return a verdict after one has been excused.

In the guide

Protections and risks

What protects a Colorado juror after the verdict, and what state law says about people outside the trial who try to reach a juror or to interfere with how jurors are chosen.

In the guide

The law in plain English

The Colorado laws behind the chapter in everyday words. They include the statute on unanimous verdicts, the statute on the right to a jury and its size, the jury tampering law, the court rule on challenges to jurors, and the jury section of the state constitution.

In the guide

Official state resources

Links to Colorado's official sources, each one checked. They cover the statutes, constitution and court rules on the legislature's site, the Judicial Branch's model criminal jury instructions, and the Judicial Branch's page for people called to serve.

Your summons

Called for Jury Duty in Colorado?

A Colorado jury summons asks you to come to court and help decide a case on the evidence. If you are picked, the judge will give you the law, and you and the other jurors will decide what happened.

The Colorado Judicial Branch has a page for people who have been called. It covers reporting, who can serve, and how to ask to be excused.

That page covers getting to the courthouse. How a judge decides whether a possible juror can be fair, what the opening instruction says, and what happens to a verdict when a juror is excused are covered in the Colorado chapter of the guide.

Your Colorado summons

  • Sent byThe state court administrator
  • Names come fromVoter registration, driver's license and ID card records, and state income tax addresses
  • It asks you toCome to court and help decide a case on the evidence
  • Jury size12 (felony), 6 (misdemeanor)

Get the guide

Get the Colorado guide

A Colorado jury hears its first instruction before anyone has been picked to serve. By then you are already in the room. What that instruction asks of you, how twelve or six people reach one verdict, and what state law protects afterwards are in the Colorado chapter. Get the guide and read it before you walk in.

Colorado

The Colorado guide

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  • The full Colorado chapter, all six parts
  • Jury selection, the judge's instructions, the verdict and juror protections
  • Colorado's laws in plain English, with links to the official sources
  • Free updates when the law changes
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See what's inside the guide

Every Colorado source was checked against its official site on October 19, 2026.