Colorado Will Requirements: Signing, Witnesses, and Formats

A will is valid in Colorado if the person making it is at least 18 and of sound mind, the will is in writing, the testator signs it (or directs someone to sign for them in their presence), and either two witnesses sign it or the testator acknowledges it before a notary public. Those are the Colorado will requirements at their core, and every other rule about wills in the state builds on them.¹

Who Can Make a Will

You have to be at least 18 years old. You also need testamentary capacity, which in Colorado means understanding roughly what you own, knowing who your close family members are, and understanding how the will distributes your property. Age by itself doesn’t disqualify anyone, and a diagnosis doesn’t automatically strip capacity, but a condition like advanced dementia can.

Putting the Will in Writing

The will must exist as a written document. Typed or handwritten both work, and since 2021 an electronic document that’s readable as text also qualifies under the Uniform Electronic Wills Act.² Colorado does not recognize oral wills. A spoken deathbed instruction, no matter how many people hear it, has no legal effect as a will in this state.

Signing the Will

You sign the will yourself. If you physically cannot, another person can sign your name for you, but only if they do it at your direction and in your presence. That’s it for the testator’s signature. There’s no requirement about where on the page it goes or that it be witnessed at a specific moment, though signing in front of the witnesses is the cleanest approach.¹

Two Witnesses or a Notary

After you sign, Colorado gives you a choice. You can have at least two witnesses sign the will, each within a reasonable time after watching you sign or hearing you acknowledge your signature. Or you can acknowledge the will before a notary public, which satisfies the execution requirement on its own. The notary option was added to Colorado law in 2008.¹

Witnesses do not have to be disinterested. A person named as a beneficiary in the will can still serve as a valid witness, and their inheritance is not affected. This is a real departure from what many people expect, and it can matter when signing happens on short notice.

The Self-Proving Affidavit

If you use witnesses, you and those witnesses can also sign a self-proving affidavit before a notary. This is separate from the notary-only execution option; it’s an extra layer on top of a witnessed will. The affidavit doesn’t make the will any more valid, but it lets the probate court accept the will without tracking down the witnesses years later to confirm what they saw. It also raises the bar for anyone trying to challenge the will on grounds like incapacity or undue influence, because the witnesses swore to those points under oath at the time of signing.³

Formats Colorado Accepts

Attested Wills

The standard form. Typed or written, signed by you, signed by two witnesses (or acknowledged before a notary). This is the format that faces the fewest challenges in probate because everything about its execution is on the page.

Holographic Wills

A holographic will is one you write entirely by hand and sign yourself. Colorado recognizes it even without witnesses, as long as the signature and the material portions are in your own handwriting.¹ The tradeoff is exposure to disputes. Because there are no witnesses to confirm what happened, a court can look at outside evidence to decide whether you actually meant the document to be your will.

Electronic Wills

An electronic will has to be readable as text when it’s signed, and you have to sign it electronically (or direct someone to sign for you while you’re physically present). It still needs either two witnesses or notarization, but the witnesses and notary can be in your electronic presence rather than the same room. Witnesses must be located within a U.S. state at signing, and any notary must be located in Colorado.²

Keeping a Valid Will Valid Over Time

A properly executed will stays valid until you revoke it or replace it. Colorado recognizes two ways to revoke. You can create a new will that either expressly revokes the old one or is so inconsistent with it that the two can’t coexist. Or you can physically destroy the document, by burning, tearing, or otherwise obliterating it, with the intent to revoke. Another person can perform the physical act if they do it in your presence and at your direction.⁴

For small changes, a codicil amends the existing will. It must meet the same execution rules as the will itself: your signature and either two witnesses or notarization. For anything larger than a minor tweak, drafting a fresh will that expressly revokes the old one is cleaner.

What a Valid Will Cannot Do

Even a will that meets every execution requirement can’t fully disinherit a surviving spouse in Colorado. A surviving spouse can claim 50 percent of the marital-property portion of what’s called the augmented estate. That figure pulls in more than just probate assets; it also counts certain nonprobate transfers, the surviving spouse’s own property, and property transferred during the marriage.⁵

There’s also a supplemental amount. If the spouse’s own property and other entitlements fall below a minimum dollar floor (adjusted annually for inflation), the spouse can claim enough to reach that floor. A spouse who wants to exercise the elective share has to file a petition with the court, generally within nine months of the death or six months of probate being opened, whichever is later.

How a Valid-Looking Will Can Still Be Challenged

Meeting execution requirements gets a will admitted, but interested parties can still contest it. The recognized grounds in Colorado are:

Lack of capacity. The testator didn’t understand what they owned, who their natural beneficiaries were, or what signing meant.
Undue influence. Someone pressured or manipulated the testator into terms they wouldn’t otherwise have chosen. Courts weigh the relationship, the testator’s vulnerability, and whether the will’s terms look suspicious.
Fraud. The testator was deceived about what the document was or what it said.
Improper execution. The signing, witnessing, or notarization didn’t meet the statute.

The challenger carries the burden of proof. This is the practical payoff of the self-proving affidavit: the witnesses attested under oath at signing that the testator was of sound mind and acting freely, so a later challenge on capacity or influence starts uphill.³

If you’re preparing a will and want it to hold up with the least friction, the shortest checklist is this: be sure of your capacity, put it in writing, sign it, use two witnesses, add a self-proving affidavit before a notary, and keep the original somewhere your personal representative can actually find it.