This page is information, not legal advice. Montana bans sanctuary policies statewide under HB 200, signed in 2021. The Montana Highway Patrol signed a statewide Task Force Model 287(g) agreement in February 2025. The Attorney General is actively enforcing the sanctuary ban against Helena and Gallatin County. Missoula maintains a practical non-enforcement posture but has no formal legal protection. Verify current conditions with the ACLU of Montana or a licensed immigration attorney.
Montana operates under a statewide prohibition on sanctuary policies and has actively expanded immigration enforcement cooperation since early 2025. House Bill 200, signed into law in 2021, bans any city or county from refusing to cooperate with federal immigration authorities. No city or county in Montana can lawfully adopt sanctuary policies under state law.
In February 2025, Attorney General Austin Knudsen signed a 287(g) agreement with the Department of Homeland Security, allowing Montana Highway Patrol troopers and Division of Criminal Investigation agents to perform certain federal immigration enforcement functions. This statewide agreement means that MHP troopers can conduct immigration enforcement during routine traffic stops and patrol activities across all of Montana's 56 counties. Several county sheriff offices have also signed county-level agreements.
Montana's small population and large geography present specific enforcement dynamics. Immigrant communities in Montana are concentrated in agricultural regions, the Flathead Valley, the Missoula area, and communities near the Canadian border. CBP has jurisdiction within 100 miles of the Canadian border, which covers a large portion of northern Montana. Enforcement in Montana involves both ICE and CBP, with CBP operating under different border zone authorities.
Part 1: Your rights under federal law - everywhere, including Montana
These rights come from the U.S. Constitution. They apply in Montana regardless of immigration status, citizenship, or how you entered the country.
At your front door
The Fourth Amendment protects your home from government entry without your consent or a judicial warrant. A judicial warrant is signed by a federal judge, based on probable cause, and authorizes entry to a specific address. An administrative warrant - ICE Form I-200 or I-205 - is signed by an immigration officer, not a judge, and does not authorize entry to your home without your consent. Ask through the door which type of warrant is being presented. If it is administrative, you are not required to open the door.
During a traffic stop or street encounter
You have the right to remain silent. You do not have to answer questions about where you were born, your immigration history, or your status. You can say you are exercising your right to remain silent and want to speak to a lawyer. You can ask whether you are free to go. If the officer says yes, you may calmly leave.
Do not lie and do not provide false documents. Silence is a legal right. False statements are a separate crime. Many families carry a printed card asserting these rights.
Within 100 miles of the Canadian border
U.S. Customs and Border Protection has legal authority to conduct stops and brief questioning within 100 miles of any U.S. border, including the Canadian border. Montana's northern border with Canada means CBP operates with broader authority across a large portion of the state. CBP can ask about citizenship and immigration status during border zone encounters. Your right to remain silent still applies, but the legal dynamics of border zone encounters differ from interior enforcement. If you are near the Canadian border and are stopped, knowing whether the agent is CBP or ICE matters for understanding their legal authority.
At your workplace
ICE may enter public areas of a workplace without a warrant. Private, non-public areas generally require a judicial warrant or employer consent. You have the right to remain silent in any workplace encounter.
Do not sign anything without a lawyer
Documents presented during an ICE arrest may include voluntary departure agreements or stipulated removal orders that waive your right to a hearing before an immigration judge. Do not sign anything without speaking to an attorney first.
Part 2: HB 200 - statewide sanctuary ban
Montana House Bill 200, signed in 2021, prohibits any city or county from adopting policies that limit cooperation with federal immigration enforcement. No Montana municipality can lawfully declare itself a sanctuary city or adopt policies that restrict local cooperation with ICE. The law gives the attorney general enforcement authority over non-compliant local governments.
Attorney General Knudsen has actively used this enforcement authority. When the City of Helena passed a resolution in January 2026 directing police to avoid assisting federal immigration enforcement, Knudsen announced he was investigating whether Helena had violated HB 200. When the Gallatin County Attorney's office sent guidance to local law enforcement in October 2025 stating that ICE was not legally recognized as a law enforcement agency entitled to receive confidential criminal justice information, Knudsen sent a cease-and-desist letter in April 2026 demanding the policy be rescinded within days.
These enforcement actions make clear that even policies that fall short of a formal sanctuary designation - like requiring ICE agents to identify themselves, or limiting the sharing of confidential criminal justice information with ICE - are being challenged by the state's attorney general as potential violations of HB 200. The enforcement environment against local governments attempting to limit ICE cooperation is active.
Part 3: The Montana 287(g) landscape
Montana Highway Patrol - statewide Task Force agreement
Attorney General Knudsen signed a 287(g) agreement with DHS in February 2025 covering Montana Highway Patrol troopers and Division of Criminal Investigation agents. The Task Force Model agreement allows trained and deputized MHP troopers to conduct immigration enforcement during their routine patrol duties statewide. This mirrors what Missouri did with its highway patrol - a statewide agency with Task Force Model authority means that any traffic stop on any Montana highway by a trained MHP trooper can involve immigration enforcement elements.
County-level agreements
Gallatin County (Bozeman) has a long-standing Warrant Service Officer agreement with ICE. Under this model, ICE reviews individuals booked into the Gallatin County Detention Center and identifies people for detainer warrants, which trained county officers then serve. The county sheriff described the arrangement as routine processing.
Garfield County in eastern Montana signed a Task Force Model agreement in August 2025. The undersheriff cited the county's vast geography - 4,800 square miles - and described the agreement as a tool for enforcement across the remote eastern Montana county. Financial incentives played a role: the 287(g) program reimburses participating Task Force Model agencies for officer salaries, benefits, partial overtime, equipment, and vehicles.
Cascade County (Great Falls) had a pending 287(g) agreement in 2025. Verify the current status of that and any other county agreements with the ACLU of Montana or the ICE 287(g) database, as agreements continue to be signed.
Part 4: City-level postures - Missoula, Helena, and the AG's limits
Montana's cities vary in their practical approach to immigration enforcement, though all are constrained by HB 200.
Missoula's mayor and police chief published guidance stating that city officers do not ask about immigration status during routine public interactions and do not enforce federal immigration law. This posture is practical and community-safety based - but it is not formalized in a resolution or ordinance that could conflict with HB 200. Missoula has maintained this approach without triggering formal AG action. Families in Missoula benefit from a local police department that has committed not to participate in civil immigration enforcement, though this is policy rather than law and could change.
Helena passed a resolution in January 2026 directing police to avoid assisting federal immigration enforcement, and also requiring ICE agents to identify and unmask themselves before police would cooperate. Attorney General Knudsen announced an investigation into whether this resolution violates HB 200. The outcome of that investigation and whether Helena maintained its resolution under legal pressure should be verified with current sources.
Bozeman is in Gallatin County, which has an active WSO 287(g) agreement through the county sheriff. Even if Bozeman city police maintain a non-enforcement posture, booking into the Gallatin County jail through any arrest can result in ICE detainer processing through the county's WSO agreement.
Part 5: Montana's immigrant communities and enforcement context
Montana's immigrant population is smaller and more dispersed than in most states, but it includes established agricultural worker communities, particularly in the Flathead Valley, Treasure Valley areas, and along the Hi-Line in northern Montana. These communities include people who have lived in Montana for years and work in agriculture, food processing, and construction.
Montana's location along the Canadian border brings CBP into the enforcement picture in ways not present in states farther from international borders. People living in northern Montana counties are within the 100-mile border zone where CBP has expanded authority. Border Patrol checkpoints and traffic operations occur on highways in northern Montana.
The ACLU of Montana, under legal director Alex Rate, has been publicly critical of the 287(g) program's expansion in Montana and has monitored AG enforcement actions against local governments. They are the most current source for legal developments in the state.
Part 6: What to do right now, before anything happens
Know your A-number and make sure trusted family members have it written down. Montana is a large state with limited detention facilities; detainees may be transferred out of state.
Know whether you are in the 100-mile border zone. Most of northern Montana is within this zone, giving CBP broader stop and question authority than ICE has in the interior. If you live in a northern Montana county, understanding the difference between CBP and ICE authority is practical knowledge.
Know your county. In Gallatin County, a booking into the county jail through any arrest can result in ICE detainer processing. In counties with Task Force Model agreements, a traffic stop by a trained deputy can include immigration enforcement elements. The MHP statewide agreement means that any MHP traffic stop on state roads carries this potential statewide.
Identify an immigration attorney before you need one. Montana has limited immigration legal services infrastructure. The ACLU of Montana and Montana Legal Services Association are primary contacts.
Prepare guardianship documents for any children. Set up a financial power of attorney so a trusted person can manage accounts and property if you are detained.
Part 7: Legal help and resources in Montana
The ACLU of Montana has been the most active legal organization monitoring Montana's enforcement landscape, the AG's actions against Helena and Gallatin County, and the 287(g) expansion. Their legal director Alex Rate has been publicly engaged on these issues. Their website is aclumontana.org.
Montana Legal Services Association provides free civil legal help to low-income Montanans in all 56 counties, including immigration matters. Their website is montanalegalservices.com.
Montana Free Press has been the primary news organization covering Montana's immigration enforcement landscape and is the best source for current enforcement developments across the state.
For immigration court case information, call the EOIR automated line at 1-800-898-7180. To locate someone in ICE custody, use the ICE Online Detainee Locator at locator.ice.gov. Montana detainees may be held at the Cascade County Detention Center in Great Falls or transferred to detention facilities in other states. Call the ICE Detention Reporting and Information Line at 1-888-351-4024 if your person does not appear in the locator.
Immigration Advocates Network lists Montana legal providers at immigrationadvocates.org.
Montana bans sanctuary policies statewide, has a Montana Highway Patrol agreement covering the entire state, and has county-level 287(g) agreements in Gallatin, Garfield, and potentially other counties. The attorney general has actively pursued local governments that have attempted to limit ICE cooperation, including Helena's resolution and Gallatin County's data-sharing guidance. Missoula maintains a practical non-enforcement posture without a formal policy that would trigger AG action. Northern Montana communities live within CBP's 100-mile border zone. Your federal constitutional rights apply in full across Montana: an administrative warrant does not authorize entry to your home, your right to remain silent is unchanged, and you cannot be compelled to sign anything without a lawyer. Knowing those rights, knowing your county's specific enforcement posture, and having legal contacts before a crisis are the foundations for protecting your family here.
This page reflects conditions as of mid-2026. The Montana Highway Patrol statewide Task Force agreement has been active since February 2025. The AG's investigation of Helena's resolution and cease-and-desist to Gallatin County were ongoing as of April 2026. Verify the current status of those proceedings and any new county 287(g) agreements with the ACLU of Montana or Montana Free Press.