A felony DUI charge usually comes to people who already know the system, and who often assume the outcome is settled. It is not. A felony DUI depends entirely on prior convictions, and each prior has to be the right kind, properly entered, and counted under the right rule. The sentencing statute also gives the court two very different paths. I am certified in NHTSA Standardized Field Sobriety Testing, I have worked inside a local prosecutor's office, and I served as a federal law clerk. I use that background to test both the new arrest and the record the State is relying on. For an overview of Montana DUI law, see our Missoula DUI defense page.
What Makes a DUI a Felony in Montana
Under MCA § 61-8-1008(1), a DUI is a felony in either of two situations:
- you have any combination of three or more prior convictions for DUI, DUI-related negligent homicide (MCA § 45-5-104), negligent vehicular assault (MCA § 45-5-205), or DUI-based criminal child endangerment (MCA § 45-5-628(1)(e)); or
- you have any prior conviction for vehicular homicide while under the influence (MCA § 45-5-106) or aggravated vehicular homicide while under the influence (MCA § 45-5-107). In that case, even a second DUI is a felony.
Priors from other states, tribal courts, and unvacated bail forfeitures count, and for a third or later offense there is no time limit on how old a prior can be (MCA § 61-8-1011(1)). Under-21 DUI convictions do not count (MCA § 61-8-1007(3)(b)). Our second and third DUI page covers the counting rules in more detail.
The Two Sentencing Options for a First Felony DUI
For a first felony DUI, MCA § 61-8-1008(1)(a) gives the court two options. Both carry a fine of $5,000 to $10,000.
- Department of Corrections commitment.A term of 13 months to 2 years with the Department of Corrections, followed by a consecutive 5-year term to the Montana State Prison or Montana Women's Prison, all of which must be suspended. The DOC term may not be deferred or suspended, and the person is not eligible for parole. The placement may be a residential alcohol treatment program approved by DOC. Once the program is complete, the rest of the 13-month to 2-year term is served on probation. Probation conditions under the statute include no alcohol, no bars, aftercare, testing, and an ignition interlock if you are allowed to drive.
- Treatment court. A term of up to 5 years in an appropriate treatment court program, with required completion. The court may suspend the sentence but may not defer imposition.
Which path a court chooses can depend on your history, your treatment record, and what we put in front of the judge. Deferral is not available for any DUI (MCA § 61-8-1011(4)).
On fines: the Montana Supreme Court has held a mandatory DUI fine unconstitutional where it was imposed without considering the defendant's ability to pay (State v. Gibbons, 2024 MT 63). That case involved an earlier felony DUI statute. Whether it reaches the current fines is a question worth raising.
Later Felony DUIs Carry Much Longer Sentences
The penalties climb for people with earlier felony DUI sentences. MCA § 61-8-1008(2) allows up to 10 years in the state prison and a $5,000 to $10,000 fine. The next tier allows up to 25 years (§ 61-8-1008(3)). The highest tier is 5 to 25 years, and the first 5 years may not be suspended (§ 61-8-1008(4)). Which tier applies depends on your exact sentencing history, so it has to be read from the record, not assumed.
Related DUI Felonies
Some DUI cases are charged as felonies because of what happened, not because of prior convictions. Each of these also counts toward a future felony DUI.
| Offense | Statute | Penalty |
|---|---|---|
| Vehicular homicide while under the influence | MCA § 45-5-106 | Up to 30 years in state prison, a fine up to $50,000, or both; no deferral |
| Aggravated vehicular homicide while under the influence (new in 2025) | MCA § 45-5-107 | 3 to 30 years, a fine of $10,000 to $50,000, or both; first 3 years may not be suspended; no deferral |
| Criminal child endangerment (DUI with a child under 14) | MCA § 45-5-628(1)(e) | Up to 10 years in state prison, a fine up to $50,000, or both |
| Negligent vehicular assault causing serious bodily injury | MCA § 45-5-205 | Up to 10 years, a fine up to $10,000, or both |
Aggravated vehicular homicide applies when a death is caused during a DUI that also meets the aggravated DUI definition. Criminal child endangerment applies when driving under the influence, or aggravated DUI, with a child in the vehicle causes a substantial risk of death or serious bodily injury to a child under 14.
Where a Missoula Felony DUI Is Heard
District courts have original jurisdiction over felony cases (MCA § 3-5-302(1)(a)). Missoula County is in the Fourth Judicial District (MCA § 3-5-101). Initial appearances on felony charges may happen in Missoula County Justice Court before the case moves to district court. The State generally has 5 years after the offense to file a felony charge (MCA § 45-1-205(2)(a)).
License and 24/7 Consequences
A felony DUI conviction brings at least a 1-year loss of your license, and the license is marked with probation restrictions: you may not drive unless your probation officer authorizes it or the vehicle has an ignition interlock (MCA § 61-5-208(6)). The details of how MVD handles a felony record are worth reviewing case by case, and our license suspension and hearings page explains the process. Because you have prior DUI convictions, a court can also require 24/7 Sobriety Program testing as a bond condition while the case is pending (MCA § 44-4-1205(2)(a)).
How I Defend a Felony DUI
Depending on the facts, I look at:
- each prior conviction: its date, the court, what it was for, and whether it qualifies under § 61-8-1008;
- the lawfulness of the stop and arrest, and how the field sobriety tests were given;
- the reliability of the breath or blood evidence;
- the case for the treatment court option, or for the least restrictive placement available.
Removing one prior from the count can take a case out of felony territory. Every case turns on its own record and facts.
This page explains Montana law in general as of the 2025 Montana Code Annotated. It is not legal advice about your specific case.