How to Contest a Will in Colorado

A will contest is a formal legal challenge to a will after a family member believes the document does not reflect the decedent's real wishes. Contesting a will in Colorado is possible, but it is not a way to reargue how someone chose to divide their property. The challenge has to rest on a specific legal ground, the person bringing it has to have standing, and it moves through a formal court proceeding with real deadlines. This guide covers the grounds, who can file, where and when, no-contest clauses, and what the process involves.

Most Colorado wills are never contested. But when the circumstances raise real concern, a caregiver who appeared late and took most of the estate, a signing during serious illness, or a signature that does not look right, a contest may be the right path. If you are weighing one, start by organizing the facts you would bring to a lawyer, and read the Colorado probate guide so you understand the process a contest slots into.

What a Will Contest Is (and Is Not)

A will contest asks the court to declare that the will, or part of it, is invalid. If the challenge succeeds, the probated will is set aside, and the estate passes either under an earlier valid will or, if there is none, under Colorado's intestate succession rules. A contest is the wrong tool when the real complaint is that you expected more, that you dislike the distribution, or that the personal representative is administering the estate poorly. That last problem is handled by objecting to the representative or the accounting, not by attacking the will. A contest often turns on whether Colorado's signing rules were followed, so for the full requirements, see the Colorado will requirements guide.

Colorado routes a contest into a formal testacy proceeding. Most Colorado estates open informally with the court registrar, without a hearing, under C.R.S. 15-12-301. When someone questions a will's validity, an interested person petitions for formal proceedings, and a judge decides the question after notice and a hearing. (Source: C.R.S. 15-12-401.)

Who Can Contest a Will in Colorado

Only an interested person can contest a will, meaning someone with a financial stake, a person who would inherit more if the will were thrown out. The most common contestants are:

• Heirs at law. People who would inherit under Colorado's intestate succession statute if there were no valid will. Under C.R.S. 15-11-102 and 15-11-103, that group runs from the surviving spouse and descendants out to parents, siblings, and more distant relatives, depending on who survives.
• Beneficiaries under a prior will. If an earlier will left you more than the current one, you have a stake in setting the later will aside.
• Beneficiaries named in the contested will, usually when an earlier document treated them better.

Friends, distant relatives who would not inherit under intestacy, and charities not named in any version of the will generally lack standing. The test is simple: would you be better off financially if the will were declared invalid? If not, the court will not hear your challenge. Colorado also lets any interested person who was left out of an informal case demand that the estate move to formal proceedings, which is often the first step toward a contest.

The Grounds for Contesting a Will

Colorado recognizes a handful of grounds for invalidating a will. The person bringing the contest carries the burden of proof. A will offered for probate is presumed valid once the proponent establishes due execution, and the contestant has to overcome that presumption with evidence. Vague suspicion is not enough.

1. Lack of Testamentary Capacity

Colorado requires the testator to be eighteen or more years of age and of sound mind when the will is signed. (Source: C.R.S. 15-11-501.) Sound mind means the testator understood, at the moment of signing:

1. That they were making a will to dispose of their property at death
2. The general nature and extent of what they owned
3. The people who would naturally inherit from them, such as a spouse and children
4. How the will distributed the property among those people

Capacity is measured at the exact time of signing, not before or after. A diagnosis of dementia does not automatically prove incapacity, because a person with cognitive decline can have a lucid interval and validly sign during it. To win on this ground, a contestant usually relies on medical records from around the signing date, testimony from doctors and caregivers, and observations from people who saw the testator near that time.

2. Undue Influence

Undue influence is the most commonly alleged ground and one of the hardest to prove. It applies when someone in a position of trust used pressure or control that overpowered the testator's free will, so the will reflects the influencer's wishes rather than the testator's own. Ordinary persuasion, even forceful persuasion, is not enough. Colorado courts look for a confidential relationship between the testator and the beneficiary, combined with suspicious circumstances, such as the beneficiary's activity in getting the will made and a result that favors them.

Common red flags include a caregiver or new companion who appeared shortly before the will changed, a testator isolated from family, an unexplained shift from an earlier estate plan, and a beneficiary who chose the drafting attorney or sat in on the signing. Because a confidential relationship can shift how the evidence is weighed, these cases often turn on the pattern of circumstances rather than a single smoking gun. Note that Colorado does not void a gift just because a beneficiary also served as a witness. (Source: C.R.S. 15-11-505.) An interested witness is a factor to argue, not an automatic win.

3. Fraud or Forgery

Fraud means the testator was deliberately deceived in a way that changed the will. Two forms come up: fraud in the execution, where the testator was tricked about what the document was (told they were signing a power of attorney when it was actually a will), and fraud in the inducement, where false information changed a bequest (a lie that a child had abandoned or stolen from them). Forgery is a separate claim that the signature on the will is not the testator's, or that the document was fabricated, and it usually requires a forensic document examiner to compare the disputed signature against known samples.

4. Improper Execution

A Colorado will is only valid if it was signed the way the Probate Code requires. Under C.R.S. 15-11-502, the will must be in writing, signed by the testator (or by someone else in the testator's conscious presence and at the testator's direction), and then either witnessed or notarized. The witnessed path needs at least two individuals who each sign within a reasonable time after watching the testator sign or after hearing the testator acknowledge the signature or the will. The notary path lets the testator acknowledge the will before a notary public with no witnesses at all, an option most states do not offer. Colorado also recognizes an unwitnessed holographic will if the signature and the material portions are in the testator's handwriting. A contest on this ground argues that no valid path was followed: only one witness signed, a witness never actually saw the signing, or a supposed holographic will is not truly in the testator's hand. Improper execution is often easier to prove than the mental-state grounds because it depends on procedural facts rather than the testator's state of mind. Colorado does add a safety valve: under C.R.S. 15-11-503, a court can still treat a defective document as a will if the proponent proves by clear and convincing evidence that the decedent intended it as one.

5. Revocation by a Later Will

A will can also be attacked as no longer operative because the testator revoked it. Colorado allows revocation by a later will that revokes the earlier one expressly or by inconsistency, and by a revocatory act such as burning, tearing, canceling, obliterating, or destroying the document with intent to revoke. (Source: C.R.S. 15-11-507.) If a valid later will or codicil exists, the earlier document should not govern. Divorce is a related trigger: a Colorado divorce or annulment automatically revokes revocable gifts and fiduciary appointments to the former spouse unless a governing instrument says otherwise. (Source: C.R.S. 15-11-804.)

Where and When You File

A Colorado will contest is filed as a formal testacy proceeding in the district court for the county where the decedent lived, in one of Colorado's 23 judicial districts. The single exception is the City and County of Denver, where the standalone Denver Probate Court hears the case. Colorado does not use a separate county-level probate court anywhere else. (Source: Colorado Judicial Branch; C.R.S. 15-12-401.)

Timing matters. Colorado law provides that probate, testacy, and appointment proceedings generally must be commenced within three years after the decedent's death. (Source: C.R.S. 15-12-108.) That outer limit is longer than the short post-admission windows in some states, but do not treat it as breathing room. Shorter deadlines can apply once a formal proceeding is under way, once notice is served, or once an order is entered, and the exact period for your situation depends on how the case has moved. Confirm the current deadline that applies to you with a licensed Colorado attorney before you rely on any date. Building a contest also takes time to gather records, locate witnesses, and retain an expert, and once the applicable deadline passes the right to contest is generally lost for good.

No-Contest (In Terrorem) Clauses

Some wills include a no-contest clause, also called an in terrorem clause, that tries to disinherit any beneficiary who challenges the will. A typical version reads: if any beneficiary contests this will, that person's share is forfeited. The purpose is to scare beneficiaries out of litigating.

The general rule across many states is that a no-contest clause is enforceable, but a court will not enforce it against a challenger who had probable cause, a real, reasonable, good-faith basis for the contest rather than a fishing expedition. That probable-cause exception is common, but it is not uniform, so confirm how a Colorado court would treat a no-contest clause on your facts with a licensed Colorado attorney before you file. The stakes are higher when a clause is present: a beneficiary who contests without a solid basis can lose an inheritance they would otherwise have kept. Get the clause and your evidence reviewed under the current Colorado Probate Code before you act.

The Process, Step by Step

1. Consult a probate litigator. Will contests are litigation, not routine estate paperwork. Find a Colorado attorney who handles contested probate, and have them assess standing, grounds, and the deadline first.
2. Petition for formal proceedings. If the estate opened informally with the registrar, the challenge starts by petitioning the district court, or the Denver Probate Court, for a formal testacy proceeding under C.R.S. 15-12-401, stating the grounds and naming the personal representative and beneficiaries.
3. Notice and response. Interested persons receive notice and can appear. A petitioner can also ask for supervised administration to keep the personal representative under continuing court oversight while the dispute is pending.
4. Discovery. Both sides exchange evidence: depositions of the drafting attorney, the attesting witnesses, caregivers, and family; subpoenas for medical and financial records; and expert reports on capacity or handwriting.
5. Mediation and settlement. Many contests settle. A negotiated redistribution often costs far less than a trial and lets the family keep some control over the result.
6. Hearing or trial. If the case does not settle, a judge hears it. The contestant must overcome the presumption that a duly executed will is valid.

What a Contest Costs and Whether It Is Worth It

Will contests are expensive and slow. Even a fairly clean case can take a year or more and run well into five figures in attorney fees, plus costs for experts, depositions, and records, and relatives often end up testifying under oath about a loved one's mental state and private affairs. For estate expenses generally, see the Colorado probate costs guide, and for how a contest stretches the calendar, the Colorado probate timeline guide. Before filing, weigh a few questions honestly:

• Do you have standing? Would you actually inherit more if the will were set aside?
• Do you have a real ground? Is there evidence of incapacity, undue influence, fraud, forgery, or a signing defect, not just disappointment?
• Is there a no-contest clause, and what is your probable-cause assessment?
• Is the likely recovery worth the cost, the family strain, and could a settlement or mediation resolve it faster and for less?

If the answers point to a legitimate claim, move quickly. Evidence is easiest to gather early, and the deadlines only tighten once a case is under way.

Related Guides

• Colorado Will Requirements - what makes a will valid in Colorado
• Colorado Probate Guide - how a Colorado estate moves through court
• Colorado Intestate Succession - who inherits if a will is set aside
• Colorado Probate Timeline - the deadlines a contest runs against
• Colorado Probate Costs - what estate administration and disputes cost

Sources

Sources:

• Title: C.R.S. 15-11-501, Who may make a will; and 15-11-502, Execution; witnessed or notarized wills; holographic wills. Publisher: Colorado Revised Statutes, Title 15 (Colorado General Assembly). Publication Date: Current official code, accessed 2026-07-01. URL: https://leg.colorado.gov/colorado-revised-statutes
• Title: C.R.S. 15-11-503 (writings intended as wills), 15-11-505 (who may witness; interested witness), 15-11-507 (revocation by writing or act), and 15-11-804 (revocation by divorce). Publisher: Colorado Revised Statutes, Title 15 (Colorado General Assembly). Publication Date: Current official code, accessed 2026-07-01. URL: https://leg.colorado.gov/colorado-revised-statutes
• Title: C.R.S. 15-12-108 (limitations on probate, testacy, and appointment proceedings), 15-12-301 (informal probate application), and 15-12-401 (formal testacy proceedings). Publisher: Colorado Revised Statutes, Title 15 (Colorado General Assembly). Publication Date: Current official code, accessed 2026-07-01. URL: https://leg.colorado.gov/colorado-revised-statutes
• Title: Probate Court (district courts and the Denver Probate Court). Publisher: Colorado Judicial Branch. Publication Date: Current, accessed 2026-07-01. URL: https://www.coloradojudicial.gov/courts/trial-courts/probate-court

This guide is general information about contesting a will in Colorado. Will contests involve complex litigation, and the deadlines tighten once a case is under way, so confirm your grounds, standing, and the current deadline with a licensed Colorado attorney before you file. It is not legal advice.