Montana Custody Laws for Unmarried Parents: How to Establish a Parenting Plan

If you are an unmarried parent in Montana, you and the other parent both have equal legal rights to your child — but neither of you has an enforceable parenting schedule until a court order exists. That means either parent can technically withhold the child, move to another city, or refuse contact, and law enforcement has no court order to enforce.

Filing a Petition for Parenting Plan through the District Court is the only way to establish legally enforceable parenting rights.

Why a Court Order Matters

Without a court-ordered parenting plan, your verbal agreements and informal schedules have no legal weight. If the other parent decides to keep the child and refuse contact, your only option is to call the police — and without a court order, the police cannot intervene in what they view as a civil matter between two parents with equal rights.

A court-ordered parenting plan gives you:

• A specific residential schedule that both parents must follow
• Decision-making authority over education, healthcare, and spiritual development
• A child support obligation calculated under Montana's guidelines
• Legal remedies (contempt of court) if the other parent violates the plan

Establishing Paternity

For unmarried fathers, paternity must be legally established before the court will issue a parenting plan. In Montana, paternity can be established in three ways:

1. Voluntary Acknowledgment of Paternity: Both parents sign a form at the hospital at birth or later through the Montana Department of Public Health and Human Services. This is the simplest route if both parents agree.

2. Court Order: If the mother disputes paternity, the father can file a Petition to Establish Paternity with the District Court. The court may order genetic (DNA) testing to resolve the question.

3. Administrative Order: The Montana Child Support Enforcement Division (CSED) can establish paternity administratively as part of a child support case.

Once paternity is established, the father has the same legal standing as a married father to file for a parenting plan.

How to File

Unmarried parents file a Petition for Parenting Plan (not a Petition for Dissolution of Marriage) with the District Court in the county where the child lives. The process mirrors the dissolution filing:

1. Prepare the Petition (Form MP-114) and your Proposed Parenting Plan (Form MP-300)
2. File with the Clerk of District Court and pay the $200 filing fee
3. Serve the other parent with the Summons and Petition
4. The other parent has 21 days to respond with their own proposed plan

If both parents agree on the plan, you can file a joint petition and the court can approve it without a contested hearing.

What the Court Considers

The court applies the same best-interest factors (MCA § 40-4-212) regardless of whether the parents were married. There is no legal preference for mothers over fathers, and no assumption that the child should stay with the parent who has been providing primary care — though the court does consider the child's existing routines and attachments as one of its 13 factors.

The court will also establish child support using Montana's Melson-style formula, which calculates obligations based on both parents' incomes and the number of overnights in the residential schedule.

Protecting Your Rights in the Meantime

Until you have a court order, take these steps to document your involvement:

• Keep records of your time with the child: dates, activities, pickups, drop-offs
• Communicate in writing with the other parent about scheduling — text messages and emails create a record
• Do not withhold the child from the other parent as leverage — this hurts your credibility with the judge
• File promptly if the other parent is threatening to move, restrict contact, or withhold the child

Build a Plan That Protects Your Rights

The Montana Child Custody & Parenting Plan Guide walks you through every step of the filing process for unmarried parents, including pre-written schedule templates, a best-interest documentation log, and the overnight-counting worksheet you need to ensure your child support calculation is accurate.

See more Montana guides →