Colorado does not have a stand your ground law on the books, but the practical rule is the same. The Colorado Supreme Court has held that a person who did not start a fight has no duty to retreat before using force in self-defense, whether the confrontation happens at home or in public.1FindLaw. People v. Monroe A separate statute, the “Make-My-Day” law, gives occupants of a home even broader protection against intruders.
No Statute, But No Duty to Retreat
Many states have passed stand your ground statutes that explicitly remove any obligation to flee before defending yourself. Colorado never did. Its Supreme Court reached the same result through decisions interpreting the self-defense statute. In People v. Toler (2000), the court held that a non-aggressor does not have to “retreat to the wall” before using deadly force, no matter where the confrontation happens.2FindLaw. People v. Toler Cassels v. People (2004) stated it directly: “In Colorado, only initial aggressors must retreat before using force in self-defense.”1FindLaw. People v. Monroe
The most recent word came in People v. Monroe (2020), which held that the prosecution cannot argue to a jury that a defendant acted unreasonably by failing to retreat.1FindLaw. People v. Monroe So while Colorado has no statute by that name, the rule is settled, and prosecutors are barred from using your decision not to flee as evidence against you.
When You Can Use Force
Colorado’s general self-defense statute lets you use physical force against someone when you reasonably believe that person is about to use unlawful force against you or a third person. The force you use must match what you reasonably believe is necessary to stop the threat.3Justia Law. Colorado Code Title 18 – Section 18-1-704 A shove can meet a shove. You do not need to run first, but you also cannot escalate past what the situation calls for.
Deadly force carries a higher bar. You can use lethal force only when you reasonably believe anything less would be inadequate and at least one of three conditions exists: you believe you or someone else faces imminent death or serious bodily harm; someone is committing or about to commit a burglary while threatening occupants; or someone is committing or about to commit kidnapping, robbery, sexual assault, or assault.3Justia Law. Colorado Code Title 18 – Section 18-1-704 The first condition covers most real-world self-defense shootings. The others address specific violent felonies where deadly force is presumed reasonable even if the attacker has not yet caused physical harm.
Stronger Protections Inside Your Home
Colorado’s Castle Doctrine is codified at C.R.S. 18-1-704.5, known as the Make-My-Day law. It gives occupants of a dwelling broader authority to use force than the general self-defense statute. The legislature stated its purpose plainly: “the citizens of Colorado have a right to expect absolute safety within their own homes.”4Justia Law. Colorado Code Title 18 – Section 18-1-704.5
Three conditions must all be met:
- Someone entered your dwelling unlawfully. If you invited the person in or they had lawful access, this statute does not apply, though the general self-defense rule still might.
- You reasonably believe the intruder has committed, is committing, or intends to commit a crime inside the dwelling beyond the break-in itself.
- You reasonably believe the intruder might use any physical force, however slight, against anyone inside.
When all three are satisfied, you can use any degree of force, including deadly force, with no requirement to retreat or try something less.4Justia Law. Colorado Code Title 18 – Section 18-1-704.5 The key word is “dwelling.” Courts have generally read it to mean the enclosed living space itself, not a yard, porch, or detached structure. If the confrontation happens outside those walls, you are back under the general self-defense statute.
Immunity vs. Acquittal
The Make-My-Day law gives something most self-defense laws do not: true immunity from both criminal prosecution and civil liability. If your use of force meets all three statutory conditions, you cannot be charged, and you cannot be sued for the injuries or death.4Justia Law. Colorado Code Title 18 – Section 18-1-704.5 That is a stronger shield than a not-guilty verdict, because the case can be dismissed before trial.
Immunity is not automatic. A judge holds a pretrial hearing to decide whether the evidence supports the claim. Under People v. Guenther (1987), the defendant has the right to that hearing and must establish the immunity claim by a preponderance of the evidence. If the judge is satisfied, charges are dismissed and civil suits are barred. If not, the case proceeds to trial, where ordinary self-defense is still available.
A general self-defense claim outside the home works differently. A win at trial is an acquittal, not immunity, and it does not automatically block a civil lawsuit. The other person’s family could still file a wrongful death action, where the burden of proof is lower, and you would raise self-defense again as a defense in that case.
When You Lose the Right to Self-Defense
Colorado strips the self-defense claim in several situations. The most common is being the initial aggressor. If you started the physical confrontation, you generally cannot claim you were defending yourself. One narrow exception: if you withdraw and clearly communicate that you are done, but the other person keeps coming, your right to defend yourself returns.3Justia Law. Colorado Code Title 18 – Section 18-1-704 Walking away and saying you do not want to fight counts. Pausing does not.
You also lose the claim if you deliberately provoked someone into attacking you so you could use force in return. That requires intent: you engineered the confrontation to create a pretext. Mutual combat, where both parties voluntarily agreed to fight, also eliminates self-defense for both participants.3Justia Law. Colorado Code Title 18 – Section 18-1-704
Colorado specifically bars self-defense claims based on the discovery of another person’s gender identity, gender expression, or sexual orientation. An unwanted but nonviolent romantic advance cannot be used to justify violence in response.3Justia Law. Colorado Code Title 18 – Section 18-1-704 This provision prevents a defendant from arguing that another person’s identity itself was a threat.
Defending Others and Protecting Property
The same rules that let you use force to protect yourself apply when you are protecting someone else. If you reasonably believe a third person faces unlawful force, you can intervene with whatever degree of force you reasonably believe is necessary, including deadly force when the threat rises to that level.3Justia Law. Colorado Code Title 18 – Section 18-1-704 The risk is misreading the situation. If the person you stepped in to help was actually the aggressor, your force may not be justified.
Protecting property follows different rules. You can use reasonable physical force to stop someone from stealing, damaging, or tampering with your property. Deadly force is never justified to protect property alone. It becomes available during a property crime only if the situation also meets the general self-defense standard, meaning a genuine threat of death or serious injury to a person.5Colorado Public Law. Colorado Code CRS 18-1-706 – Use of Physical Force in Defense of Property Shooting someone stealing your car from the driveway, when no one is physically threatened, is not covered.
How Reasonable Belief Gets Judged
Nearly every element of Colorado’s self-defense law turns on whether your belief about the threat was reasonable. The standard has two parts. You must have actually believed you were in danger, and a hypothetical reasonable person in the same circumstances must have reached the same conclusion. A sincere but unreasonable belief fails.
Factors that typically support a reasonable belief include the attacker’s size advantage, being outnumbered, a visible or implied weapon, the attacker’s words and body language, and the time of day or isolation of the location. Age and physical ability also matter. A 70-year-old facing two younger adults is in a different position than a fit 25-year-old facing the same two, and courts account for that. A general feeling of unease, or a belief based on stereotype rather than specific threatening conduct, does not help.
Juries evaluate reasonableness after the fact, with calm deliberation you did not have. A decision that felt obvious in the moment can look less clear-cut when reconstructed weeks later. Physical evidence, witness accounts, and your own statements right after the incident weigh heavily on whether a jury accepts your version.
After the Incident
Everything you say and do after using force becomes evidence. You have a constitutional right to remain silent and a right to speak with an attorney before answering questions. Exercising those rights is not a crime, and silence cannot be used against you at trial. Lying to the police is a crime and will destroy your credibility if the case reaches a courtroom.
Emergency call recordings are admissible. Courts routinely allow 911 recordings under hearsay exceptions because they capture statements made during an unfolding emergency. Anything you say on that call, including things blurted out under stress, can be played for a jury. The same goes for statements picked up by police body cameras once officers arrive. Keep the 911 call to what gets help there: your location, that you need police and an ambulance, and a basic description of what happened. Save the full account for your attorney.
Retain a criminal defense attorney quickly. Self-defense cases involving serious injury or death are investigated as potential homicides until the evidence proves otherwise, and the pretrial choices made in the first days often shape the entire case.