In Wyoming, unmarried fathers have no automatic custody rights until paternity is legally established under the Wyoming Parentage Act (W.S. § 14-2-401 through 14-2-907). The mother holds sole custody by default, even when the father's name appears on the birth certificate. Filing fees range from $70 to $160 depending on county, and Wyoming's new 2025 shared custody presumption (SF0117) applies equally to unmarried parents once paternity is confirmed. Establishing paternity unlocks the father's rights to custody, visitation, and decision-making authority under Wyoming law.
Key Facts: Custody for Unmarried Parents in Wyoming
| Factor | Wyoming Requirement |
|---|---|
| Filing Fee | $70-$160 (varies by county) |
| Child Residency for Jurisdiction | 6 consecutive months (UCCJEA home state rule) |
| Parent Residency to File | 60 days minimum |
| Paternity Establishment | Required before father gains any custody rights |
| Custody Presumption | Shared custody (50/50) as of July 1, 2025 |
| DNA Testing Threshold | 99% probability required to establish paternity |
| Best Interests Standard | 9 statutory factors under W.S. § 20-2-201 |
How Paternity Affects Custody Rights for Unmarried Parents in Wyoming
Unmarried mothers in Wyoming automatically receive sole legal and physical custody of their children at birth, regardless of whether the father's name appears on the birth certificate. Under W.S. § 14-2-501, the parent-child relationship between a mother and child is established by the woman giving birth to the child. For fathers, however, the relationship must be established through one of the methods outlined in the Wyoming Parentage Act before any custody or visitation rights can be pursued.
This legal framework means that an unmarried father who has been actively involved in his child's life from birth still cannot file for custody until paternity is formally established. The distinction is critical because without established paternity, the father has no standing to request custody modifications, object to relocation, or participate in major decisions about the child's education, healthcare, or religious upbringing.
Once paternity is established, Wyoming courts apply the same best-interests standard to unmarried parents as they do to divorcing married couples. Under W.S. § 20-2-201, the court cannot prefer one parent solely because of gender, and the 2025 shared custody presumption applies equally to all parents regardless of marital status.
Methods to Establish Paternity in Wyoming
Wyoming law provides two primary methods for establishing paternity: voluntary acknowledgment and court adjudication. Each method has distinct procedural requirements and legal consequences that unmarried parents must understand before proceeding.
Voluntary Acknowledgment of Paternity
The fastest and least expensive method to establish paternity is through a voluntary Affidavit Acknowledging Paternity filed with the Wyoming Office of Vital Records. Both parents must sign the affidavit before a notary public, and the document must contain specific statements required under W.S. § 14-2-601. Hospital staff can assist parents in completing this form at the time of birth free of charge.
For the affidavit to be valid, it must state that the child has no presumed father (or that the presumed father is signing a denial), indicate whether genetic testing was completed, and provide notice that the acknowledgment has the same legal effect as a court order. Once properly executed and filed, a voluntary acknowledgment cannot be challenged after 60 days except under limited circumstances involving fraud, duress, or material mistake of fact. After 2 years, challenges are completely barred.
Court Adjudication Through Genetic Testing
When parents cannot agree on paternity or when the alleged father denies being the biological parent, court adjudication becomes necessary. Under Wyoming law, the court must order genetic testing when either party submits a sworn statement alleging or denying paternity with facts establishing a reasonable probability of sexual contact during conception.
Wyoming requires a 99% probability threshold and a paternity index of at least 100 to 1 to establish paternity through DNA testing. The Wyoming Child Support Program pays for genetic testing in all IV-D cases, and results are admissible in court without testimony unless a party objects. An alleged father can only rebut 99% probability results by providing alternative genetic testing from an accredited laboratory showing he is not the father or identifying another man as the possible father.
Wyoming's 2025 Shared Custody Presumption for Unmarried Parents
Effective July 1, 2025, Wyoming Senate File 0117 created a presumption of shared custody that applies to all parents, including those who were never married. This represents a significant change in Wyoming family law, establishing joint legal custody and joint physical custody with substantially equal parenting time as the default arrangement.
Under the new law, courts must enter a shared custody order unless one of five statutory exceptions is proven: the parties have agreed in writing to a different arrangement, one or both parties have been convicted of domestic violence against the other party, one or both parties have been convicted of child abuse or neglect, the parties reside more than 300 miles apart making equal parenting time impractical, or there is clear and convincing evidence that a different arrangement serves the children's best interests.
For unmarried fathers, this presumption creates a more favorable starting point once paternity is established. Rather than having to prove why they should receive custody, fathers now benefit from the legal assumption that equal parenting time is appropriate unless the mother can demonstrate one of the statutory exceptions.
Best Interests Factors Under Wyoming Statute
Wyoming courts evaluate 9 statutory factors when determining custody arrangements for unmarried parents under W.S. § 20-2-201. Each factor carries weight in the court's analysis, and no single factor automatically determines the outcome.
The quality of the relationship each child has with each parent forms the foundation of the court's inquiry. Judges examine the emotional bonds, attachment patterns, and day-to-day interactions between parent and child. Courts also assess each parent's ability to provide adequate care for the child, including physical care, supervision, and meeting the child's developmental needs.
Relative competency and fitness of each parent encompasses mental health, substance use history, criminal background, and parenting skills. Each parent's willingness to accept all responsibilities of parenting demonstrates commitment beyond merely seeking time with the child. The court evaluates how parents and children can best maintain and strengthen relationships with each other, examining communication patterns and the ability to facilitate healthy connections.
How parents interact and communicate with each other directly impacts custody decisions. Courts favor parents who can co-parent cooperatively without conflict. The ability and willingness to allow the other parent to provide care without intrusion measures whether each parent can step back and permit the other parent to be effective. Geographic distance between parents' residences affects the practicality of various custody arrangements. Finally, courts may consider any other factors deemed necessary and relevant to the specific family situation.
Filing for Custody as an Unmarried Parent in Wyoming
Unmarried parents seeking custody in Wyoming must navigate specific procedural requirements that differ from divorce proceedings. The filing process begins with establishing proper jurisdiction and preparing the necessary court documents.
Jurisdictional Requirements
Wyoming follows the Uniform Child Custody Jurisdiction and Enforcement Act (UCCJEA) under W.S. § 20-5-201 et seq., which requires the child to have lived in Wyoming for 6 consecutive months immediately before filing for the court to have initial custody jurisdiction. This home state rule applies regardless of where the parents reside.
Emergency jurisdiction allows Wyoming courts to act when a child is in immediate danger or has been abandoned, even without meeting the 6-month residency requirement. However, emergency orders are temporary and jurisdiction typically reverts to the home state once the emergency is resolved. For parents seeking to file for divorce (which may include custody), Wyoming requires only 60 days of residency for the filing parent.
Court Costs and Fees
Filing fees for custody cases in Wyoming range from $70 to $160 depending on the county, making Wyoming one of the most affordable states for court costs. Additional expenses include service of process fees ($25-$75), court-ordered mediation ($100-$300 per session), and guardian ad litem fees if appointed ($1,500-$5,000 or more).
Custody evaluations by court-appointed psychologists can cost $3,500 to $10,000 when ordered. Required parenting classes cost $25-$50 per parent in most county courts. Parents who cannot afford filing fees may complete an Affidavit of Indigency using Packet 10 available from Wyoming courts, though fee waiver approval is at judicial discretion.
Required Documents
Unmarried parents filing for custody must prepare several key documents: a petition for custody establishing the basis for the request, proof of paternity (acknowledgment or court order), a proposed parenting plan with detailed custody and visitation schedules, and a Child Support Computation Form (DIVCP-13) calculating the appropriate support amount. Courts also require an Affidavit for UCCJEA Disclosure providing information about any other custody proceedings involving the child.
Child Support for Unmarried Parents in Wyoming
Wyoming uses the income shares model under W.S. § 20-2-304 to calculate child support, combining both parents' net incomes to determine a total support obligation divided proportionally based on each parent's share of combined income. This calculation applies identically to married and unmarried parents once paternity is established.
Net income under Wyoming guidelines equals gross income minus federal, state, and local taxes, FICA contributions, mandatory retirement contributions, union dues, and health insurance premiums. For combined net monthly income of $5,000, the presumptive child support amount is $693 for one child and $1,046 for two children.
The self-support reserve in Wyoming equals the federal poverty guideline for one person, which is $1,255 per month ($15,060 annually) in 2026. If the obligor's net income minus the self-support reserve is less than the calculated support obligation, courts reduce the support amount to prevent the obligor from falling below the poverty line.
Wyoming provides three calculation methods based on custody arrangements. The basic calculation applies to sole custody situations. Shared custody calculations apply when each parent has more than 92 overnights per year (25% of the time), multiplying the total obligation by 150% and offsetting between parents. Split custody calculations apply when each parent has physical custody of at least one child.
The Wyoming Child Support Program and Unmarried Parents
The Wyoming Child Support Program provides free assistance to unmarried parents seeking to establish paternity, custody, and child support orders. There are no income limits or eligibility requirements to receive help from the program, which can guide parents through the entire legal process.
Program services include assistance with paternity establishment through genetic testing, preparation of custody and support petitions, location of absent parents, establishment and enforcement of support orders, and collection and distribution of child support payments. The program pays for genetic testing costs in all IV-D cases and can help parents navigate the court system without hiring private attorneys.
Unmarried parents can contact the Child Support Program through their local district office or the state program website. The program operates offices in every Wyoming county and provides Spanish-language services upon request.
Modification of Custody Orders for Unmarried Parents
Custody orders for unmarried parents can be modified when there is a material change in circumstances affecting the child's best interests. Wyoming courts apply the same modification standards to all parents regardless of marital status at the time of the child's birth.
Common grounds for modification include relocation of a parent, changes in the child's needs, domestic violence or substance abuse concerns, a parent's failure to follow the existing order, and significant changes in either parent's circumstances. The parent seeking modification bears the burden of proving that circumstances have materially changed since the last order and that the proposed modification serves the child's best interests.
Modification petitions are filed in the same court that issued the original order, and filing fees of $70-$160 apply. Courts may order updated custody evaluations, appoint guardians ad litem, or require mediation before hearing modification requests. Emergency modifications can be granted on a temporary basis when a child faces immediate harm.
Frequently Asked Questions About Custody for Unmarried Parents in Wyoming
Does an unmarried father have custody rights in Wyoming?
No, an unmarried father has no automatic custody rights in Wyoming until paternity is legally established under W.S. § 14-2-401. Even if his name appears on the birth certificate, the mother holds sole custody by default. After establishing paternity through voluntary acknowledgment or court order, the father can petition for custody and Wyoming's 2025 shared custody presumption applies equally to him.
How long does it take to establish paternity in Wyoming?
Voluntary paternity acknowledgment can be completed at the hospital within hours of birth or filed with Vital Records within days. Court-ordered paternity through genetic testing typically takes 3-6 months from petition filing to final order. DNA test results usually arrive within 2-3 weeks after sample collection, and Wyoming requires a 99% probability threshold to establish paternity.
What does Wyoming's shared custody presumption mean for unmarried parents?
Wyoming's 2025 shared custody law (SF0117) presumes that both parents should have joint legal custody and joint physical custody with substantially equal parenting time. This applies to unmarried parents once paternity is established. Courts must order shared custody unless one of five statutory exceptions is proven: written agreement otherwise, domestic violence conviction, child abuse conviction, parents living 300+ miles apart, or clear and convincing evidence that shared custody is not in the child's best interests.
How much does it cost to file for custody in Wyoming?
Custody filing fees in Wyoming range from $70 to $160 depending on the county, among the lowest in the nation. Additional costs include service of process ($25-$75), mediation if ordered ($100-$300 per session), parenting classes ($25-$50 per parent), and custody evaluations if ordered ($3,500-$10,000). Fee waivers are available for qualifying low-income parents through the Affidavit of Indigency form.
Can an unmarried mother move out of state with the child?
An unmarried mother with sole custody (before paternity establishment) may relocate without court permission in Wyoming. However, once paternity is established and a custody order exists, the relocating parent must provide written notice and the other parent can object. Courts evaluate relocation requests under the best-interests standard, considering factors such as the reason for the move, impact on the child's relationship with the non-relocating parent, and the child's ties to Wyoming.
How does Wyoming calculate child support for unmarried parents?
Wyoming uses the income shares model under W.S. § 20-2-304, combining both parents' net incomes to determine total support divided proportionally. For $5,000 combined monthly net income, presumptive support is $693 for one child. Parents with 92+ overnights annually qualify for shared custody calculations that reduce the support amount. The self-support reserve of $1,255/month (2026 federal poverty level) protects low-income obligors.
What if the alleged father refuses DNA testing in Wyoming?
Wyoming courts can order genetic testing when either party files a sworn statement alleging or denying paternity with facts establishing probable sexual contact during conception. Refusal to comply with a court-ordered DNA test can result in contempt of court sanctions and an adverse inference that the refusing party is the father. The Wyoming Child Support Program pays for testing in IV-D cases.
How does the Putative Father Registry work in Wyoming?
A man who believes he is a child's father but is not married to the mother can register with the Wyoming Putative Father Registry to document his claim to paternity. Registration creates a record of his efforts to identify himself as the father and ensures he receives notice of any adoption or custody proceedings. Registration does not establish legal paternity but protects the putative father's right to participate in legal proceedings.
Can unmarried parents create their own custody agreement in Wyoming?
Yes, unmarried parents can negotiate and submit their own custody agreement to the court for approval. The agreement must be in writing, signed by both parties, and cover legal custody, physical custody, parenting time schedules, holiday arrangements, and decision-making authority. Courts generally approve agreements that serve the child's best interests. Even with the 2025 shared custody presumption, parents can agree to different arrangements.
What happens if paternity was established but the father later questions it?
Voluntary paternity acknowledgments cannot be rescinded after 60 days except in cases of fraud, duress, or material mistake of fact, and all challenges are barred after 2 years under Wyoming law. Court-adjudicated paternity orders are even more difficult to overturn. A man seeking to disestablish paternity must provide genetic testing from an accredited laboratory showing he is not the biological father and demonstrate that disestablishment serves the child's best interests.
Resources for Unmarried Parents Seeking Custody in Wyoming
Wyoming provides several resources for unmarried parents navigating the custody process. The Wyoming Judicial Branch Self-Help Center offers forms, instructions, and procedural guidance for self-represented parties. The Wyoming Child Support Program assists with paternity establishment and support orders at no cost. Legal Aid of Wyoming provides free legal services to qualifying low-income parents.
Parents can access court forms including the Petition for Custody (DIVC-01), Parenting Plan template (DIVCP-07), Child Support Computation Form (DIVCP-13), and Affidavit Acknowledging Paternity through the Wyoming Courts website. Each district court also maintains a self-help desk where staff can answer procedural questions, though they cannot provide legal advice.
For complex custody disputes involving domestic violence, substance abuse, or relocation, consulting with a qualified Wyoming family law attorney is strongly recommended. The Wyoming State Bar Lawyer Referral Service can connect parents with attorneys who offer free or reduced-cost initial consultations.