Reviewed and updated October 9, 2026 by the SearchSystems.net editorial team. The arrest counts are the ones each agency reported to the FBI, as the FBI held them on October 8, 2026. The jail figures are from the Vera Institute of Justice's Incarceration Trends data. Every office link was opened and checked against the office's own site between September 24, 2026 and October 4, 2026.
Big Horn County, Montana, has about 13,000 residents (2024 Census Bureau estimate). A DUI arrest in Big Horn County starts two cases, a criminal case in a Justice or Municipal Court and a license case before the Motor Vehicle Division, and leaves three records. This guide follows the arrest from the roadside to the court file and the driving record.
This guide covers the law, the arrest, booking, the court case, the license case, the records and common questions.
Related guides: Big Horn County public records, Big Horn County arrest records, Big Horn County warrants, Big Horn County inmate search, Big Horn County criminal records, Montana arrest records and Montana inmate search.
The DUI Law in Montana
In Montana the offense is DUI, and the limit is 0.08.
Driving in Montana is consent to a breath or blood test when an officer has cause to suspect DUI; the license case that follows a refusal or a failed test is run by the Motor Vehicle Division, separately from the criminal case.
Who Makes DUI Arrests in Big Horn County
The Big Horn County Sheriff's Office and the agency that reports for Hardin make the DUI arrests in Big Horn County.
Together, the two agencies in Big Horn County with all twelve months of 2025 on file reported 454 arrests to the FBI that year, all offenses together; the FBI's count for Big Horn County does not break DUI out.
Booking After a DUI Arrest in Big Horn County
A driver arrested for DUI and kept in custody goes to the county jail, whichever agency made the arrest. The jail, run by the Big Horn County Sheriff's Office, held about 34 people on an average day in 2021 by the Vera Institute of Justice's count and has a jail page SearchSystems verified at bighorncountymt.gov/176/Sheriff, phone 406-665-9802. The Big Horn County inmate search guide covers the jail in full.
The Court Case
A DUI charge from Big Horn County is heard in a Justice or Municipal Court; the County Attorney or, in a municipal court, the city's own prosecutor brings it.
The County Attorney's page SearchSystems verified is at bighorncountymt.gov/163/County-Attorney, phone (406) 665-9720.
The court records page SearchSystems verified for the county is at bighorncountymt.gov/172/Justice-Court, phone 800-666-6899. That page belongs to a lower court, the Justice Court, not to the Big Horn County District Court.
Montana has no single public index of every trial court case; each court's records are looked up through that court.
The License Case
The court case is only half the record. The Motor Vehicle Division runs a separate administrative case over the license, which can suspend it before the criminal case is decided, and the Montana Motor Vehicle Division keeps the driving record the conviction goes on.
The Records a DUI Leaves
- The arrest report: from the agency that made the arrest, under the Montana Public Records Act.
- The court file: from a Justice or Municipal Court, kept by the Clerk of District Court.
- The driving record: from the Montana Motor Vehicle Division.
More on each: Big Horn County arrest records, Big Horn County police reports and Big Horn County court records.
Frequently Asked Questions
What is the DUI limit in Montana?
0.08 percent blood alcohol.
Where is a DUI case from Big Horn County heard?
In a Justice or Municipal Court. The court records page SearchSystems verified for the county is at bighorncountymt.gov/172/Justice-Court.
Where is a person arrested for DUI in Big Horn County held?
At the county jail, run by the Big Horn County Sheriff's Office, if kept in custody.
Who handles the license after a DUI arrest in Montana?
The Motor Vehicle Division, in an administrative case separate from the court case.
Is this the official Big Horn County website?
No. SearchSystems.net is an independent public records guide, online since 1997. It links to the official county, court and state offices described above and does not hold records, charge for them or take requests.