Home Arrest and Jail Alternatives for a Montana DUI

Montana law allows some DUI jail time to be served on home arrest, in another facility, or with release for work. The catch is the mandatory minimum: that part of a DUI sentence may not be served under home arrest. This page explains each alternative, who decides, and where the limits are. It is part of our Montana DUI Guide.

The Minimum Comes First

Every misdemeanor DUI tier except a first per se DUI has a minimum jail term, from 24 consecutive hours to 90 consecutive days. The statute says that minimum "may not be served under home arrest and may not be suspended" unless the judge finds that jail will pose a risk to the person's physical or mental well-being (MCA § 61-8-1007(1)(d), (2)(d), (4)(b)). Our page on mandatory jail time lists the minimum for each offense.

Everything below applies to the jail time a court imposes above that minimum, or to how and where the sentence is served.

The Options Montana Law Provides

None of these is automatic. Each one depends on a decision by the judge, and several depend on the sheriff, a monitoring provider, or a program the county may or may not run.

How Home Arrest Works

Home arrest is governed by Title 46, chapter 18, part 10. It is a form of confinement in your own residence, enforced by a monitoring device. The statute defines that device as an electronic device capable of recording or transmitting information about your presence in or absence from the home, and it may include an apparatus that tests your breath for alcohol. A telephone alone does not qualify (MCA § 46-18-1001(3)).

The process, under MCA § 46-18-1002:

• You file a petition with the sentencing court. It can be considered before or during the sentence.
• The petition must include a company that can and will carry out the monitoring and the type of device, your employer and supervisor, any treatment or education plan, your income, and the address and everyone who will live there.
• Each adult in the home must sign a written, notarized consent.
• The supervising authority reviews it and accepts or rejects you. If it rejects you, the judge must dismiss the petition. If it accepts, the judge may hold a hearing and grant or deny it.
• The term may not exceed 6 months.

A person held on a detainer or warrant from another jurisdiction is not eligible (MCA § 46-18-1004).

What You Can Leave Home For

The court sets the conditions. Under MCA § 46-18-1003(1), they may confine you to the home at all times except when you are:

• working at approved employment, traveling directly to and from it, or seeking employment;
• in medical or mental health treatment, or an approved counseling or aftercare program;
• attending an approved educational program or a regularly scheduled religious service;
• doing approved community service; or
• following a schedule the supervising authority has written.

You may not change the address or the schedule without approval, and you must keep the monitoring device on your person at all times. A violation can lead to a warrant, a hearing, and an order to serve the rest of the sentence in jail (§ 46-18-1003(2)).

Serving Time in Another Facility

A court may order that a DUI jail term be served "in another facility made available by the county and approved by the sentencing court" (MCA § 61-8-1011(2)). The facility may be a community-based prerelease center, and the center may accept or reject the referral. If you are financially able, you bear the expense. The court can restrict your ability to leave and require you to follow the facility's rules.

Unlike the home arrest provision, this subsection is not written as an exception to the minimum. It changes the place of confinement, not whether you are confined.

Work Release and County Work Programs

Under MCA § 46-18-701, a court may order that any part of a county jail sentence be served with limited release during the hours you are actually employed. It requires a request from the county attorney and the sheriff and your consent. The sheriff collects your earnings and pays your board and personal expenses from them (MCA § 46-18-702).

Separately, a county may run a jail work program in which a person convicted of a nonviolent offense performs county work without physical confinement. Each day worked counts as 2 days of incarceration, the sheriff must approve the person, and the sentencing judge can prohibit participation (MCA §§ 7-32-2226(3), 7-32-2227). Whether a county offers this, and whether a court treats it as satisfying a DUI minimum, is a local question the statutes do not answer directly.

Monitoring and Treatment in Place of More Jail

For many people the real alternative to additional jail is the suspended portion of the sentence. Jail above the minimum may be suspended for up to 1 year pending completion of treatment, with conditions that can include the 24/7 Sobriety Program and a DUI court where one is available (MCA § 61-8-1007(1)(e)). Our pages on DUI probation conditions and DUI treatment courts cover those paths.

These options are easier to obtain when they are prepared before the sentencing hearing: a monitoring provider lined up, an employer letter, a treatment enrollment, and a workable address. What a given court will approve varies, and none of them is available as of right.

This page explains Montana law in general as of the 2025 Montana Code Annotated. It is not legal advice about your specific case.