Montana's only general waiting period for a divorce is short: when one spouse files, a decree may not be entered until 21 days after the other spouse is served. There is no longer cooling-off period in the statutes. What actually determines how long a case lasts is everything that has to happen before a judge can sign a decree. This page separates the legal minimums from the practical factors. It is part of our Montana Divorce Guide.
The 21-Day Rule
Montana calls divorce a dissolution of marriage. The procedure statute says that if a proceeding is commenced by one of the parties, the other must be served and "may within 21 days after the date of service file a verified response. A decree may not be entered until 21 days after the date of service" (MCA § 40-4-105(3)).
Notice what starts the clock. It is the date of service, not the date of filing. If it takes time to serve your spouse, the 21 days have not begun. See serving divorce papers in Montana.
The rule is written for a case started by one spouse. When both spouses file a joint petition, neither is served with it, and the statute does not state a separate waiting period for that situation. Courts still need time to review the papers, and practice varies by court.
Every Time Period in the Dissolution Statutes
Several numbers appear in the statutes, and they are easy to confuse. Only some of them are waits.
| Period | What it is | When it runs | MCA |
|---|---|---|---|
| 90 days | Montana domicile or military stationing before filing | Before you file | § 40-4-104(1)(a) |
| More than 180 days | Living separate and apart, as one of two ways to show the marriage is broken. Not required if there is serious marital discord. | Before you file | § 40-4-104(1)(b) |
| 21 days | Time for the served spouse to file a response, and the earliest a decree may be entered after service | After service | § 40-4-105(3) |
| 60 days | Deadline to serve the preliminary declaration of disclosure, unless the spouses agree in writing to change or waive it | After service | § 40-4-252(1) |
| 30 to 60 days | Possible continuance if one spouse denies under oath that the marriage is irretrievably broken | During the case | § 40-4-107(2)(b) |
| 45 days | Final declaration of disclosure is due no later than this many days before the first assigned trial date, if the case goes to trial | Before trial | § 40-4-253(1) |
| After 20 days | Earliest hearing in a summary dissolution, counted from filing the joint petition | Summary dissolution only | § 40-4-133 |
| 6 months | Earliest a decree of legal separation can be converted to a dissolution | After a legal separation | § 40-4-108(2) |
The first two rows are easy to mistake for waiting periods. The 90-day residency requirement and the 180-day separation are both measured backward from the day you file. If you already meet them, they add nothing to the length of the case.
No Other Cooling-Off Period
We read the sections of Title 40, chapter 4 that govern how a dissolution begins and ends (MCA §§ 40-4-104 through 40-4-108). Apart from the 21 days after service, they do not require a set amount of time to pass between filing and decree, and they do not require counseling or a separation as a condition of a decree.
One provision can add a pause. If one spouse denies under oath that the marriage is irretrievably broken, the court may make the finding right away or may continue the matter for a further hearing "not fewer than 30 or more than 60 days later," or as soon after that as the court's calendar allows, and may suggest counseling (MCA § 40-4-107(2)). That applies only when the breakdown itself is disputed.
What Actually Controls Timing
A decree requires more than the passage of 21 days. The court must find that it has considered, approved, or provided for parenting, child support, maintenance, and property (MCA § 40-4-104(1)(c)). How long a case lasts depends on how long it takes to resolve those four things. The main factors:
- Service. Nothing runs until the other spouse is served. A spouse who is hard to locate adds steps. See if you cannot find your spouse.
- Financial disclosure. Each spouse serves a preliminary declaration within 60 days of service of the petition unless they agree otherwise in writing, and a final declaration before or at the time of an agreement. Absent good cause, the court may not enter a property judgment without the final declarations (MCA §§ 40-4-252 to 40-4-254).
- Agreement. Spouses who reach a complete written agreement can ask for a decree by affidavit without a hearing (MCA § 40-4-108(4)). Spouses who cannot agree need the court to decide, which means hearings.
- Children. A parenting plan must be incorporated into the decree (MCA § 40-4-234(1)), and child support must be determined under the guidelines (MCA § 40-4-204(3)(a)).
- Complex property. A business, a pension, or real estate may need to be valued before anyone can agree on a division.
- The court's calendar. Hearing dates depend on the judge's docket, which differs from one judicial district to another.
We do not quote a typical duration, because the statutes do not set one and the answer depends on these factors. Our page on how long a divorce takes in Montana looks at the stages in more detail.
Summary Dissolution and Legal Separation
Two procedures have their own timing rules. In a summary dissolution, the court holds a hearing "after 20 days from the date of the filing of the joint petition," and both spouses must attend (MCA § 40-4-133). The 20 days is counted from filing because there is no service.
A legal separationcan be converted to a dissolution on either spouse's motion, but "no earlier than 6 months after entry" of the separation decree (MCA § 40-4-108(2)). That is a wait only for people who chose a legal separation first.
After the Decree
A decree of dissolution "is final when entered, subject to the right of appeal" (MCA § 40-4-108(1)). The section does not add a waiting period before the dissolution takes effect or before either person may remarry. An appeal that does not challenge the finding of irretrievable breakdown does not delay the finality of the part of the decree that dissolves the marriage, and "either of the parties may remarry pending appeal."
Finality of the marriage status is not the same as finishing every task. Transferring a house or dividing a retirement account can take additional time after the decree.
What You Can Do About Timing
You cannot shorten the 21 days or control the court's calendar. You can gather your financial records early, complete your disclosures fully and on time, and work toward agreement where agreement is safe. Complete, accurate disclosure is required by law, and it avoids delay caused by missing information.
Moving quickly is not always the right goal. If you are being pressed to sign something you do not understand, or you are afraid of your spouse, slow down and get advice. If you are in danger, call 911. The National Domestic Violence Hotline is 1-800-799-7233.
This page explains Montana law in general as of the 2025 Montana Code Annotated. It is not legal advice about your specific situation.