When can I appeal a conviction in Colorado?

On Behalf of | Sep 3, 2025 | Criminal Defense |

Before considering appealing a case in Colorado, it is helpful to understand the common grounds for appeal. These often include:

  • Legal error or insufficient evidence
  • Juror misconduct
  • Crime lab misconduct
  • Ineffective assistance of counsel

Those who believe their case qualifies can move forward with a Petition for Post-Conviction relief. It is important to note that the state’s rules are strict and only a small percentage reach a favorable result. The following will provide additional information on each ground as well as the basics of the process to help better ensure your case is part of that small percentage.

Legal error or insufficient evidence

A legal error occurs when the trial court makes a mistake in applying the law. This could involve incorrect jury instructions, improper admission or exclusion of evidence, or misinterpretation of legal principles. Such errors can significantly impact the outcome of a case, making them a common ground for appeal.

An appeal based on insufficient evidence argues that no reasonable jury could have reached the verdict given the evidence presented. This is a challenging argument, as appellate courts typically defer to the jury’s findings. The courts may consider an appeal if the evidence does not support the verdict.

Juror misconduct

Juror misconduct involves inappropriate behavior by jurors that could affect the fairness of the trial. This might include discussing the case outside of deliberations, influence from outside information, or demonstrating bias. Such actions can undermine the integrity of the trial process.

Crime lab misconduct

This is generally initiated after the District Attorney sends you a Notice about misconduct. Once you receive this notice, you can file a Petition for Post-Conviction Relief. Examples can include altering reports, falsifying test results, failing quality control, and misidentification.

Ineffective assistance of counsel

If a defendant believes their attorney did not competently represent them, they might appeal on the grounds of ineffective assistance of counsel. This requires showing that the attorney’s performance was deficient and that this failure prejudiced the defense, affecting the trial’s outcome.

Bonus: How long do I have to file an appeal?

In Colorado, the deadline for filing an appeal varies depending on the type of case. Generally, for criminal cases, you must file a notice of appeal within 49 days after the entry of the judgment. It is crucial to adhere to these deadlines, as missing them can forfeit the right to appeal.

To initiate an appeal, the appellant must file a notice of appeal with the appropriate appellate court. This document outlines the intent to appeal and the grounds for the appeal. It is important to understand the reasons and process for appealing a case in Colorado before moving forward with this legal remedy.

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