In Montana, divorce papers are served under Rule 4 of the Montana Rules of Civil Procedure. Someone other than you, either a sheriff or another adult who is not a party, delivers the summons and the petition to your spouse personally, or your spouse signs and returns a written acknowledgment of service by mail. The dissolution statute itself says only that the other party "must be served in the manner provided by the Montana Rules of Civil Procedure" (MCA § 40-4-105(3)). This page is part of the filing section of our Montana Divorce Guide.
Rule 4 is written for all civil cases, so it speaks of a plaintiff, a defendant, and a complaint. In a dissolution those are the petitioner, the respondent, and the petition (MCA § 40-4-103(3)).
What Gets Served
After you file, you present a summons to the clerk, who issues it. The summons names the court and the parties, states the time within which the other spouse must appear and defend, and warns that failing to do so will result in a default judgment for the relief demanded (M. R. Civ. P. 4(c)(2)(A)). In a dissolution the clerk also includes the automatic economic restraining order with the summons (MCA § 40-4-126(1)).
The summons and the petition must be served together, and the filing spouse furnishes the copies (M. R. Civ. P. 4(d)(1)). The rule puts the burden of having the summons properly issued, served, and filed on the party who requested it (M. R. Civ. P. 4(c)(1)).
The Ways a Spouse Can Be Served
| Method | How it works | M. R. Civ. P. |
|---|---|---|
| Personal service | A sheriff, deputy, constable, or any other person over 18 who is not a party delivers the summons and petition to your spouse personally. | Rule 4(d)(2), 4(e)(1) |
| Mail with acknowledgment | The papers are sent by first class mail with two copies of a notice and acknowledgment and a prepaid return envelope. Your spouse signs, dates, and returns the acknowledgment. | Rule 4(d)(3) |
| Personal service outside Montana | If your spouse cannot with due diligence be served in Montana, service may be made outside the state in the same manner as inside it. | Rule 4(n)(1) |
| Voluntary appearance | A court also acquires jurisdiction over a person who voluntarily appears in the action, personally or through an attorney. | Rule 4(b)(2)(B) |
| Publication | A last resort, allowed in a dissolution of a Montana resident's marriage when the other methods have failed and the rule's steps are followed. | Rule 4(o) |
Personal Service and Who May Serve
Personal service is the standard method. An individual is served by delivering a copy of the summons and petition to that person, or to an agent authorized by appointment or law to receive service (M. R. Civ. P. 4(e)). The person who delivers them may be a sheriff, deputy sheriff, or constable, or "any other person over the age of 18 not a party to the action" (M. R. Civ. P. 4(d)(2)).
That last phrase rules out the filing spouse. It does not rule out a friend or relative, but think about who you ask. The server may have to sign an affidavit and could be asked about it later. If there is any history of abuse or volatility, use the sheriff or a professional server. If you are in danger, call 911. The National Domestic Violence Hotline is 1-800-799-7233, and our Montana Domestic Violence Guide has more.
Service by Mail With an Acknowledgment
When spouses are on speaking terms, mail service can be simpler. The sender mails, by first class mail, a copy of the summons and petition, two copies of a notice and acknowledgment that substantially follows the official form, and a prepaid return envelope (M. R. Civ. P. 4(d)(3)(A)).
The receiving spouse signs and dates the acknowledgment and sends it back. Service is deemed complete on the date shown on it (M. R. Civ. P. 4(d)(3)(E)), and the sender files the acknowledgment with the court (M. R. Civ. P. 4(r)(2)).
Signing the acknowledgment admits only that you received the papers. It is not agreement with anything in the petition, and the signer still has the full time to respond. If no acknowledgment is received within 21 days after mailing, service has to be made in person (M. R. Civ. P. 4(d)(3)(C)).
Spouses who agree on everything can avoid service altogether by filing together. See joint petitions for dissolution.
Proof of Service
The court needs a record that service happened. Under Rule 4(r)(1), proof is made by:
- the sheriff's or other officer's certificate, including the time, date, and place of service;
- an affidavit, if someone else served the papers; or
- the written admission of the person served, showing the date and place of service.
An affidavit from a private server must state the time, date, place, and manner of service, that the server is of legal age, and that the server knew the person served to be the person named in the papers (M. R. Civ. P. 4(r)(4)). Failure to make proof does not by itself invalidate service (M. R. Civ. P. 4(r)(3)), but without proof on file a court has nothing to act on if the other spouse never responds.
What Service Sets in Motion
Several deadlines and duties run from the date of service:
- The served spouse may file a verified response within 21 days. See responding to a divorce petition.
- No decree may be entered until 21 days after service (MCA § 40-4-105(3)).
- The automatic economic restraining order becomes binding on the served spouse (MCA § 40-4-126(1), order paragraph (8)).
- Each spouse must serve a preliminary declaration of disclosure within 60 days (MCA § 40-4-252(1)). See financial disclosure.
When Service Is Difficult
Sometimes a spouse avoids service, has moved, or cannot be located. The rule addresses each situation. Service can be made outside Montana. If a diligent search fails, a court may allow service by publication in a dissolution, though that limits what the decree can do. Our page on what to do if you cannot find your spouse explains the steps. A spouse on active military duty has added federal protections, covered in military divorce in Montana.
This page explains Montana law in general as of the 2025 Montana Code Annotated and the Montana Rules of Civil Procedure. It is not legal advice about your specific case.