Under Colorado paternity law, a biological father has no automatic legal rights to his child unless parentage is formally established, and the state’s Uniform Parentage Act (C.R.S. § 19-4-101 through 19-4-130) sets out three ways to do it: a legal presumption, a signed Acknowledgment of Parentage, or a court order. Once established, that legal connection controls who can seek parenting time, who owes child support, whose name appears on the birth certificate, and whether the child can inherit or claim benefits through the father.
Who Colorado Already Treats as a Legal Parent
Some people are presumed to be a child’s legal parent without filing anything. Under C.R.S. § 19-4-105, the presumption applies if you were married to or in a civil union with the birth parent when the child was born, or if the child was born within 300 days after that marriage or civil union ended by death, divorce, or legal separation. It also applies if you attempted a marriage or civil union before the birth in a ceremony that appeared lawful, even if later declared invalid.1Justia. Colorado Code 19-4-105 – Presumption of Paternity
You are also presumed to be a parent if, after the birth, you married the birth parent and either acknowledged parentage in writing, consented to being named on the birth certificate, or became legally obligated to support the child. A separate presumption covers anyone who, while the child was a minor, took the child into their home and openly treated the child as their own. And DNA testing showing a 97% or higher probability of biological parentage creates its own presumption.1Justia. Colorado Code 19-4-105 – Presumption of Paternity
These presumptions have teeth. Overturning one takes clear and convincing evidence, which is a higher bar than the ordinary civil standard. The statute is gender-neutral and applies equally to same-sex couples and civil union partners.2Colorado Revised Statutes. Colorado Code 19-4-105 – Presumption of Paternity When two people both qualify as presumed parents of the same child, a judge decides which presumption controls by weighing how long each has filled the role, the nature of each relationship with the child, the child’s age, and how long the presumed parent knew they might not be biologically related before the case was filed.1Justia. Colorado Code 19-4-105 – Presumption of Paternity
Signing an Acknowledgment of Parentage
When both parents agree, the simplest path is signing an Acknowledgment of Parentage. The form is available at the hospital after birth or through Colorado Vital Records, and no court appearance is required.3Colorado Child Support Services. Parentage
Both parents provide full legal name, Social Security number, date of birth, and address, along with the child’s name, birth date, and birth facility. Each signs in front of a witness. If the birth parent is currently married to or in a civil union with someone other than the person signing as the second parent, the spouse or civil union partner has to sign a separate denial of parentage before the acknowledgment is valid.1Justia. Colorado Code 19-4-105 – Presumption of Paternity
A signed acknowledgment becomes a legal finding of parentage 60 days after signing, or on the date of any earlier court or administrative proceeding involving the child, whichever comes first. Either parent can rescind during that window. After 60 days, the acknowledgment carries the force of a court order and can only be undone by proving fraud, duress, or a material mistake of fact. Child support obligations keep running during any challenge unless a judge finds good cause to suspend them.1Justia. Colorado Code 19-4-105 – Presumption of Paternity
Once processed, the birth certificate is amended to include the second parent. The Colorado Department of Public Health and Environment charges a processing fee, and the schedule was updated effective January 1, 2026, so check CDPHE Vital Records for the current amount.4Colorado Department of Public Health and Environment. Correct or Change a Birth Certificate
Going to Court When Parents Disagree
When parents don’t agree, or when one refuses to sign, the case goes to court. A mother, a father, the child, a child’s representative, or the state’s child support enforcement agency can all file to establish or disclaim parentage.5Justia. Colorado Code 19-4-108 – Statute of Limitations
The case begins with Form JDF 1501, the Petition to Determine Parentage, filed in the district court for the county where the child or alleged parent lives.6Colorado Judicial Branch. Determine Parentage The current filing fee is $268.7Colorado Judicial Branch. List of Fees You’ll also prepare a summons and a proposed Final Parentage Order for the court to complete.
Colorado requires personal service, meaning someone other than you physically delivers the petition and summons to the other parent. If the other parent can’t be found despite genuine effort, you can ask the court for alternative service, which typically involves publication, but only after showing you tried every reasonable method to locate and personally serve them.8Colorado Judicial Branch. How to Serve Court Papers in Divorce and Custody Cases
After both sides are heard, the judge enters a Judgment of Parentage. A single order can address child support, parenting time, decision-making responsibility, medical insurance, and the costs of pregnancy and birth.9Justia. Colorado Code 19-4-116 – Judgment or Order
DNA Testing
Under C.R.S. § 13-25-126, any party or the judge can request genetic testing, and the court will then order the alleged mother, alleged father, and child to submit.10Justia. Colorado Code 13-25-126 – Genetic Tests If both parents agree, they sign Form JDF 1506 before a notary or court clerk and split the cost. If one refuses, the other files a Motion for Genetic Testing and initially pays the fee.6Colorado Judicial Branch. Determine Parentage Legal-grade testing for court purposes generally runs $300 to $600.
Refusing a court-ordered test is risky. The judge can resolve the whole parentage question against the person who won’t cooperate, treating the refusal as an admission.10Justia. Colorado Code 13-25-126 – Genetic Tests And a result at 97% or higher creates a presumption of parentage, shifting the burden to the tested person to disprove it.1Justia. Colorado Code 19-4-105 – Presumption of Paternity
Deadlines That Can Permanently Bar a Claim
Different deadlines apply depending on who is filing and what they want. Missing one can end the right to act forever.
A mother, father, or the child support enforcement agency can file to establish paternity any time before the child turns 18. A child whose paternity was never established has until age 21 to file independently.5Justia. Colorado Code 19-4-108 – Statute of Limitations
Disclaiming a presumed parentage has a tighter window. A presumed father must file within a reasonable time after learning facts suggesting he is not the biological parent, and no later than five years after the child’s birth.11Justia. Colorado Code 19-4-107 – Determination of Father and Child Relationship After five years, the legal relationship is permanent regardless of biology. A man who suspects he isn’t the biological father but waits too long can lose the right to challenge forever.
None of these deadlines extend inheritance or succession rights beyond what Colorado probate law otherwise allows.5Justia. Colorado Code 19-4-108 – Statute of Limitations
Undoing Paternity Once It’s Established
How you challenge established paternity depends on how it was created in the first place, and the standards get stricter the longer you wait.
If You Signed an Acknowledgment
Within 60 days of signing, you can rescind the acknowledgment without giving a reason. After that, it functions as a legal finding of paternity, and reversing it requires going to court and proving fraud, duress, or a mistake about a material fact. The person challenging carries the full burden, and any existing child support obligation keeps running during the case unless a judge specifically orders otherwise.1Justia. Colorado Code 19-4-105 – Presumption of Paternity
If Paternity Rests on a Presumption
Here you file an action to disclaim paternity, subject to the five-year hard cap and the “reasonable time” expectation after discovery of facts raising doubt. Courts treat the length of delay itself as evidence; filing within a few months of learning the facts reads very differently from waiting three years.11Justia. Colorado Code 19-4-107 – Determination of Father and Child Relationship
Once a presumption is rebutted, the same case can establish paternity for a different man as long as he has been joined as a party. There’s no need for a separate proceeding when the real question is which of two people is the father.
What Changes Once Paternity Is Legal
A legal determination turns a biological connection into an enforceable one, with real consequences on both sides.
Parenting Time and Decision-Making
The legal father gains standing to seek parenting time and what Colorado calls “allocation of parental responsibilities,” covering major decisions about education, healthcare, and religious upbringing.9Justia. Colorado Code 19-4-116 – Judgment or Order Without a formal paternity determination, a biological father has no legal right to be involved in any of these decisions, however present he has been in daily life. The court can address parenting time and decision-making in the same order that establishes paternity, so a second case isn’t required.
Child Support and Financial Obligations
Both parents become financially responsible based on their incomes and the child’s needs. A typical order covers regular support, contributions to health insurance premiums, uninsured medical costs, and childcare. A judge can also order the father to reimburse part of the mother’s pregnancy and delivery expenses and to pay for genetic testing. Support usually takes the form of periodic payments, but a court can order a lump sum or an annuity when that serves the child’s best interest.9Justia. Colorado Code 19-4-116 – Judgment or Order
When a parent falls behind, Colorado Child Support Services can withhold income from paychecks, intercept tax refunds, suspend licenses, report delinquencies to credit bureaus, and pursue court action.12Colorado Child Support Services. Enforcing Orders A parent owed support can also file independently for wage garnishment through the court.13Colorado Judicial Branch. Garnishment to Pay Child Support or Maintenance
Inheritance and Benefits
Paternity gives the child inheritance rights if the father dies without a will. The child also becomes eligible for Social Security survivor benefits, veterans’ benefits if the father served in the military, and employer-provided health insurance. For a child whose father dies while they’re still a minor, that protection can be substantial.