How to File for Divorce in Montana: Residency, Grounds & Waiting Period

To file for divorce in Montana — legally called a "dissolution of marriage" — one spouse must have been domiciled in Montana, or stationed in Montana as a member of the armed services, for the 90 days immediately before filing. From there, Montana is a no-fault state: the district court simply needs to find the marriage is "irretrievably broken." Once the petition is filed and the other spouse is served, a decree cannot be entered until at least 21 days have passed, and the other spouse has that same 21-day window to file a response. Filing also triggers an automatic restraining order on both spouses' finances the moment the paperwork is filed and served.

The Montana residency requirement

Before a Montana district court can grant a dissolution, the court must find that at least one spouse was domiciled in Montana — or stationed in Montana while serving in the armed services — and that this domicile or military presence continued for the 90 days before the case was filed. If neither spouse has been in Montana that long yet, the case generally isn't ready to be filed in a Montana court.

This is time-sensitive: if you or your spouse moved to Montana recently, count carefully from the date of the move to the date you plan to file. Filing before the 90 days are up can create problems for the case.

Grounds: Montana does not require fault

Montana abolished fault-based divorce. Instead of proving wrongdoing, the court needs to find that the marriage is "irretrievably broken." Under Montana law, that finding can rest on either of two paths:

• The spouses have lived separate and apart for more than 180 days before the dissolution proceeding, or
• There is serious marital discord that has adversely affected the attitude of one or both spouses toward the marriage.

Because Montana is no-fault, older defenses that used to be raised to block or delay a divorce — condonation, connivance, collusion, recrimination, insanity, and lapse of time — have been abolished by statute. A spouse cannot use those defenses to stop a no-fault dissolution from moving forward.

Starting the case: the petition

A Montana dissolution begins with a verified petition — meaning it's signed under oath — filed in district court. The petition must allege that the marriage is irretrievably broken and must include basic information about each spouse, such as age, occupation, and residence. Montana's courts publish official self-help forms and packets for this process, with separate versions depending on whether the couple has children, so you don't have to draft the petition from scratch.

Where to file: venue

Proper venue for a Montana dissolution is generally a county where either spouse resided at some point during the 90 days before filing. If you and your spouse lived in different counties, either one may be an option, depending on the specific residency history — check with the district court clerk in the county you're considering if you're unsure.

The waiting period after filing

Once the petition is filed and the other spouse is formally served, two clocks start running:

• The respondent has 21 days after service to file a verified response.
• The court cannot enter a final decree until at least 21 days have passed after the date of service.

Flag: these are minimums, not guarantees of a fast finish. Twenty-one days is simply the earliest a decree could legally be entered — contested custody, property, or support issues, court scheduling, or an incomplete response can extend a case well past that floor. Confirm current timelines and any local scheduling practices with your district court.

What happens to money and property automatically

When the petition is filed, the clerk of the district court issues the summons along with an Automatic Economic Restraining Order. This order:

• Binds the petitioner as soon as the petition is filed;
• Binds the respondent once they are served;
• Can be modified by the court; and
• Can be partly waived if both spouses agree in writing.

In practice, this restraining order is meant to keep either spouse from moving, hiding, transferring, or spending down shared assets while the case is pending. Ask the court or check the official packet for exactly what the order does and doesn't restrict in your case.

Temporary orders while the case is pending

Montana law also allows a party to ask the court for temporary relief while a dissolution case is working its way through — including temporary orders addressing maintenance (spousal support) or child support, as well as temporary injunctions or restraining orders. If you need income, support, or protection sorted out before the case is finished, this is generally the mechanism to raise it — talk to the court clerk or a local legal aid resource about how to request it.

If a spouse is in the military

Two separate federal laws can matter if a spouse is an active-duty servicemember:

• Servicemembers Civil Relief Act (SCRA): if military duties materially affect a servicemember's ability to appear in the case, they can ask for a stay of at least 90 days in the divorce, custody, or support proceeding. This protects a deployed or active-duty spouse from a default judgment being entered while they can't participate.
• Uniformed Services Former Spouses' Protection Act (USFSPA): this federal law allows Montana's property-division process to treat disposable military retired pay as marital property. It does not create any automatic 50/50 split — how much (if any) a former spouse receives is still decided under Montana's own property-division rules. Direct payment through military pay channels (rather than payment from the servicemember directly) generally requires the marriage to have overlapped at least 10 years with at least 10 years of military service — often called the "10/10 rule."

What you can do in Montana

1. Confirm residency. Make sure you or your spouse has been domiciled in Montana (or stationed there in the military) for at least 90 days before you plan to file.
2. Pick the right county. File in a county where either spouse resided at some point during those 90 days.
3. Get the right forms. Use the Montana Judicial Branch's official self-help dissolution packets — there are separate versions for cases with and without children.
4. File a verified petition alleging the marriage is irretrievably broken, along with the basic information the court requires about each spouse.
5. Understand the Automatic Economic Restraining Order that takes effect on you at filing and on your spouse at service, and ask the court about modifying or waiving it if needed.
6. Serve your spouse according to the court's procedures, and track the 21-day clocks that start running from the date of service.
7. Ask about temporary orders if you need support, maintenance, or a protective order while the case is still pending.
8. Flag military service early — for either spouse — since it can affect timing (SCRA) and how retirement pay is divided (USFSPA).
9. Confirm current deadlines and local procedures with your district court clerk, since scheduling and paperwork details can vary by county.

This article is general information based on official Montana statutes and federal law, not legal advice for your situation — for guidance on your specific case, talk to your Montana district court clerk or a licensed Montana attorney.