Montana Relocation Custody: The 30-Day Notice Rule Explained

You got the parenting plan signed, built a stable routine — and now one parent needs to move. Maybe it's a job transfer to Billings, a family emergency pulling someone back to the Midwest, or a new partner in another state. Whatever the reason, relocating with a child after a Montana custody order triggers a strict legal process that catches many parents off guard.

Montana's relocation rules under MCA § 40-4-217 are designed to protect the child's relationship with both parents. Miss a deadline or skip a step, and you could lose control of the outcome entirely.

The 30-Day Written Notice Requirement

Under Montana law, any parent planning to move in a way that will "significantly affect" the child's contact with the other parent must provide formal written notice at least 30 days before the proposed move.

This notice is not optional. It must include:

• The intended new address and move date
• A proposed revised residential schedule that accounts for the new distance
• The statutory warning language required by MCA § 40-4-217, informing the other parent that the relocation and new schedule may be ordered by the court without further proceedings unless they object within 21 days

The 30-day clock starts when the other parent receives the notice — not when you mail it. Use certified mail or personal service to establish a clear delivery date.

The 21-Day Response Window

Once the non-relocating parent receives the notice, they have exactly 21 calendar days to file a written objection and their own proposed alternative residential schedule with the court.

This is the part that surprises many parents: if the non-relocating parent fails to respond within 21 days, the court can approve the move and the new schedule without a hearing. Silence equals consent under this statute.

If an objection is filed, the court schedules a hearing to weigh the competing proposals. The judge considers:

• Whether the move is motivated by a genuine purpose (employment, family support, safety) or by an intent to frustrate the other parent's contact
• The child's existing ties to their school, community, and extended family
• Whether the proposed revised schedule reasonably preserves the child's relationship with both parents
• The overall best-interest factors under MCA § 40-4-212

What Counts as a "Significant" Move

Montana's statute does not define a specific mileage threshold. A move from Missoula to Helena (115 miles) might not significantly affect a biweekly exchange, but a move from Great Falls to Portland would clearly reshape the entire parenting schedule.

Courts focus on the practical impact: does the new distance make the current residential schedule unworkable? If so, the notice requirement applies regardless of whether the move crosses state lines.

Building a Long-Distance Schedule After Relocation

When a relocation is approved, the revised parenting plan typically shifts from weekly exchanges to consolidated blocks:

• Summer: 6-8 weeks of continuous parenting time with the long-distance parent
• School breaks: Alternating Thanksgiving, winter break, and spring break
• Virtual contact: Scheduled FaceTime or video calls 2-3 times per week during the school year
• Travel costs: The plan must specify how transportation expenses are divided — often split proportionally to income or assigned to the relocating parent

The Montana Child Custody & Parenting Plan Guide includes long-distance schedule templates and transition protocols specifically designed for post-relocation families.

Mistakes That Derail Relocation Cases

The most common errors parents make:

• Moving before filing notice: Relocating without providing the required 30-day written notice can result in the court ordering the child returned to the original jurisdiction
• Using vague language: A notice that says "I'm thinking about moving sometime next year" does not satisfy the statutory requirements — the notice must include a specific date, address, and proposed schedule
• Ignoring the 21-day deadline: If you receive a relocation notice and disagree with the move, file your objection immediately — waiting until day 22 likely means the court accepts the relocation by default

When to Get Professional Help

Relocation cases are among the most contested in Montana family law. If the other parent is opposing your move, or if you've received a relocation notice and need to respond, consider consulting a family law attorney. The stakes — potentially losing regular in-person contact with your child — justify the investment.

For parents still in the planning stages, the Montana Child Custody & Parenting Plan Guide walks through the relocation notice process, helps you draft a revised residential schedule, and includes worksheets for calculating how a move affects your child support under the 110-day threshold.

See more Montana guides →