Contesting a Will in Colorado: Grounds, Process, and What It Costs

Contesting a will is not the same as being unhappy with its terms. Colorado courts do not overturn valid wills because a beneficiary feels the distribution was unfair or not what the decedent would have wanted in the contestant's view. A successful will contest requires establishing specific legal grounds, bringing a formal legal challenge within a defined timeframe, and bearing the substantial cost of litigation. For many families, understanding these requirements clarifies whether a challenge is realistic or whether it is a grievance better resolved in other ways.

Who Has Standing to Contest a Will in Colorado

Not everyone can challenge a will in court. In Colorado, will contests are brought by "interested persons" — individuals who have a direct financial interest in the estate that would be affected if the will were declared invalid.

Typical interested persons include:

• Beneficiaries named in the contested will
• Beneficiaries named in a prior will who would receive more if the current will were invalidated
• Heirs at law (family members who would inherit under intestate succession if no valid will existed)
• Creditors of the estate in some circumstances

A neighbor, friend, or charity that the decedent mentioned wanting to help but did not include in the will generally lacks standing to contest.

Grounds for Contesting a Colorado Will

Colorado courts recognize four primary legal grounds for challenging a will's validity:

1. Lack of Testamentary Capacity The decedent must have understood, at the time of signing the will:

• The nature and extent of their property
• Who their natural heirs are
• What a will does and that they were making one
• How these elements relate to each other

A diagnosis of Alzheimer's disease or dementia does not automatically prove lack of capacity. Courts look at the decedent's mental state specifically at the time the will was signed. A person with significant cognitive impairment may still have had a lucid interval when they signed. Medical records, caregiver testimony, and witness accounts from the signing date are central evidence in capacity challenges.

2. Undue Influence Undue influence means someone exploited a position of trust or authority to override the testator's free will, substituting their own wishes for the testator's genuine intentions. This is the most commonly alleged ground in contested estates.

Evidence of undue influence typically includes: isolation of the elderly testator from family members, the influencer's presence at attorney meetings when the will was drafted, sudden and unexplained changes in estate planning that dramatically benefit the influencer, and the testator's physical or psychological vulnerability to domination.

Note that persuasion, manipulation, or persistent pressure that does not rise to overriding the testator's free will is not legally sufficient — the influence must have been undue, meaning it overpowered the testator's own decision-making.

3. Fraud or Forgery Fraud in the execution means the testator signed a document while believing it to be something other than a will. Fraud in the inducement means the testator was deceived about material facts that affected the testamentary disposition.

Forgery — where the testator's signature was falsified — is also a ground for invalidation.

4. Improper Execution Colorado requires a standard will to be signed by the testator and either witnessed by two competent individuals or acknowledged before a notary public (C.R.S. § 15-11-502). A will that was not properly executed — for example, signed by only one witness when two were required — may be challenged on this ground.

Holographic (handwritten) wills are valid in Colorado if the signature and material portions are in the testator's handwriting (C.R.S. § 15-11-502(2)). A holographic will challenged on execution grounds must show that those requirements were not met.

The Timeline for Filing a Will Contest

Timing is critical. Colorado imposes strict deadlines for challenging probate proceedings.

During informal probate: Any interested person can file a Petition for Formal Probate to convert the proceeding and contest the will's validity. This must be done before the estate is closed.

The ultimate bar: Under C.R.S. § 15-12-108, a formal testacy proceeding (including a will contest) generally cannot be initiated more than three years after the decedent's death. After three years, the will is effectively final regardless of its merits.

In practice, will contests are brought at or near the beginning of probate, before assets are distributed. Challenging a will after assets have been distributed requires unwinding transactions and recovering assets from beneficiaries — a significantly more complex undertaking.

How the Contest Process Works

A will contest in Colorado proceeds as a formal probate matter. It cannot be handled through the informal, administrative track. The proceeding involves:

1. Filing a Petition for Formal Probate (JDF 920) or, if informal probate is already open, objecting and demanding formal proceedings. The filing fee is $229.

2. Serving notice on all interested parties — a mandatory step before any formal probate hearing can proceed.

3. A hearing before a district court judge. The contesting party bears the burden of proving the legal grounds for invalidity by a preponderance of the evidence.

4. Discovery and evidence. Will contests involve depositions, medical record subpoenas, witness interviews, and potentially expert testimony from neurologists or forensic handwriting experts.

5. Judicial determination. The court decides whether the will is valid, partially valid, or invalid. If invalid, the court distributes the estate under a prior valid will or under intestate succession rules.

What Will Contests Actually Cost

There is no inexpensive will contest. Even a relatively straightforward contest typically involves:

• Attorney fees for the contesting party: $5,000 to $25,000 or more
• Potential attorney fees for the estate defending the will (paid from estate funds)
• Expert witness fees for medical or forensic testimony
• Deposition and discovery costs

Colorado does not routinely award attorney fees to the winning party in probate disputes — each side generally bears its own costs unless the contest was brought in bad faith. This means a successful will contest still costs the contestant their own legal fees.

Courts also have discretion to award fees against a party who brought a frivolous contest, which creates a real financial risk for challenges without solid evidentiary support.

Alternatives to a Full Contest

Not every family dispute about an estate requires a will contest. Before initiating formal litigation, consider:

Mediation: Colorado courts increasingly encourage mediation for estate disputes. A neutral mediator can help families reach a negotiated distribution without full litigation.

Negotiated settlement: Beneficiaries and heirs can agree to distribute an estate differently than the will specifies — as long as all interested parties consent and any court-required approvals are obtained. This requires attorney drafting but avoids contested litigation costs.

Elective share claim: A surviving spouse who believes they were inadequately provided for has the right to claim an elective share of the augmented estate without contesting the will's validity. The minimum elective share for 2026 is $73,000 regardless of what the will says.

What This Means for Estate Administration

If you are an executor and a beneficiary has indicated they intend to contest the will, the estate cannot proceed through informal probate. The contested status converts the matter to formal probate, requiring court hearings and potentially suspending asset distribution until the dispute is resolved.

An executor facing a will contest should retain an attorney immediately. The executor's fiduciary duty runs to the estate and to all interested parties — not to a single beneficiary's position — and managing a contested proceeding without professional guidance creates significant personal liability exposure.

The Colorado Probate Process Guide covers the distinction between formal and informal probate, the situations that require conversion to formal proceedings, and the executor's role when beneficiary disputes arise during administration.

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