Montana GPS Tracking Laws: Is It Legal to Put a Tracker on a Car? (2026)

Montana protects location privacy more aggressively than most states. Its constitution spells out an explicit right of privacy, and its criminal stalking statute names global positioning devices right in the text of the law.

So is it legal to put a tracker on a car in Montana? On a vehicle you own, yes. On someone else's vehicle, hidden tracking can become criminal stalking under MCA 45-5-220, and the penalties climb to five years in prison when aggravating factors apply.

This guide explains what the statute actually says, who can track a vehicle legally, how AirTags fit in, what penalties apply, and what to do if you find a tracker on your own car.

Is It Legal to Put a GPS Tracker on a Car in Montana?

The answer turns on whose car it is and why you are tracking it.

Tracking your own vehicle is legal. That covers your personal car, a company tracking vehicles it owns, and a parent who holds title to a teenager's car.

Tracking someone else's vehicle without consent is where Montana law bites. Montana does not have a standalone tracking-device statute the way some states do. Instead, secret GPS tracking is prosecuted as stalking when it is part of a pattern of monitoring that frightens the victim or causes substantial emotional distress.

That is not a gap in the law. The stalking statute lists GPS monitoring by name as a way to commit the offense, so prosecutors do not have to stretch older surveillance language to cover modern trackers.

Montana's Stalking Law Names GPS Devices (MCA 45-5-220)

Montana overhauled its stalking statute in 2019 and made minor amendments in 2023, and the modern version was written with tracking technology in mind.

Under MCA 45-5-220, a person commits stalking by purposely or knowingly engaging in a course of conduct directed at a specific person that would cause a reasonable person to fear death or bodily injury, or to suffer substantial emotional distress. The statute's definition of course of conduct includes monitoring or surveilling a person "using any electronic, digital, or global positioning device or similar technological means."

Hiding a tracker on an ex-partner's car and watching where they go sits squarely inside that language. So does following someone through a tracking app, an item finder, or any other location technology.

Two limits are worth understanding:

• It takes a course of conduct. Stalking requires repeated acts. A single placement of a device, standing alone, does not complete the offense. In practice, though, a tracker that keeps reporting someone's location for days or weeks looks to courts like ongoing surveillance, not a single act.
• Constitutionally protected activity is exempt. The statute does not reach lawful protest, newsgathering, or other protected conduct.

Who Can Legally Track a Vehicle in Montana

Several categories of tracking remain legal:

• Vehicle owners. You can put a GPS device on a car titled in your name. Jointly owned vehicles are murkier: a spouse tracking a shared car may have an ownership defense, but doing it secretly during a separation can still feed a stalking charge or an order of protection if it causes fear.
• Parents and guardians. Tracking your minor child's location, including a car you provide, is lawful parental supervision.
• Businesses tracking their own fleet. Companies can track vehicles they own or lease. Best practice is written disclosure to every driver.
• Lenders and lessors. Financing and lease agreements often include consent to a GPS or starter-interrupt device. That contractual consent makes the tracking lawful.
• Law enforcement with judicial authorization. Police cannot simply attach a tracker to your bumper, as explained below.

The U.S. Supreme Court held in United States v. Jones (2012) that installing a GPS device on a vehicle and using it to monitor the vehicle's movements together constitute a search under the Fourth Amendment. Montana went further: under MCA 46-5-110, a government entity may not obtain the location information of an electronic device without a search warrant issued by a duly authorized court. The statute carves out narrow exceptions, including a device reported stolen, a response to an emergency call, the informed consent of the device's owner or user, and a life-threatening situation.

Can My Employer Track My Car in Montana?

Montana has no statute that specifically regulates employer GPS tracking, so the analysis splits by who owns the vehicle.

Employers can generally track company vehicles, especially with a written policy that employees acknowledge. Courts treat the employer's ownership interest and business purpose as legitimate.

Personal vehicles are different. Montana's explicit constitutional right of privacy makes covert tracking of an employee's personal car legally hazardous, and tracking that continues off the clock is the kind of pattern that can cross into stalking territory. The practical standard is simple: employers should get clear written consent before any tracking touches a personal vehicle, and employees should ask to see the policy in writing.

Workplace monitoring rules for audio are stricter still. Montana requires consent from all parties before recording private conversations; see our guide to Montana recording laws.

AirTags and Item Trackers in Montana

Apple AirTags, Tiles, Samsung SmartTags, and similar item finders follow the same rules as hardwired GPS units. The statute's phrase "any electronic, digital, or global positioning device or similar technological means" is broad enough to cover all of them.

Dropping an AirTag into someone's bag, or magnet-mounting one in a wheel well and following their movements, is electronic monitoring under MCA 45-5-220 once it forms a course of conduct that causes fear or substantial emotional distress.

If the tracking crosses state lines, federal law adds another layer. The federal stalking statute, 18 U.S.C. 2261A, reaches the use of any electronic communication service or electronic communication system to monitor or surveil someone in a way that causes substantial emotional distress, and federal prosecutors have used it in tracker cases.

Both Apple and Google now push unwanted-tracker alerts to iPhones and Android phones. If your phone warns you that an unknown tracker is moving with you, treat the alert seriously and follow the steps at the end of this guide.

Penalties for Illegal GPS Tracking in Montana

A sentencing court can also order the defendant to stay away from the victim, and a stalking conviction frequently anchors a long-term order of protection.

Montana's Constitutional Right of Privacy

Montana is one of the few states whose constitution names privacy directly. Article II, Section 10 declares that "the right of individual privacy is essential to the well-being of a free society and shall not be infringed without the showing of a compelling state interest."

Montana courts have read that clause as more protective than the federal Fourth Amendment baseline. For GPS tracking, it matters in two ways.

First, it constrains the government. Combined with MCA 46-5-110, it is why Montana police need judicial signoff before electronic location tracking.

Second, it shapes private disputes. Courts weighing an invasion-of-privacy claim or an order of protection consider the constitutional value Montana places on being left alone, and that weight favors the person who was tracked.

Civil Options and Orders of Protection

Criminal charges are not your only remedy in Montana.

Order of protection. Under MCA 40-15-102, a victim of stalking may petition for an order of protection regardless of their relationship to the stalker. There is no filing fee, you can ask for a temporary order quickly, and the order can prohibit all contact and surveillance. Our guide to Montana restraining order laws walks through the process.

Civil lawsuit. Montana recognizes the common-law tort of invasion of privacy, including intrusion upon seclusion. Secretly tracking someone's movements is the kind of intrusion a reasonable person finds highly offensive, and the state's constitutional privacy right reinforces the claim. Damages can cover emotional distress.

Evidence. Whether you pursue charges, an order, or a lawsuit, the tracker itself, its placement, and its data trail are your central evidence, so preserve everything.

What to Do If You Find a Tracker on Your Car

1. Do not smash it or throw it away. The device, its serial number, and its placement are evidence.
2. Photograph it where you found it before touching anything: wheel well, bumper, OBD port, under a seat.
3. Call local law enforcement and ask for a report documenting the device. Mention MCA 45-5-220 if the officer is unsure that secret tracking can be charged.
4. Think about who placed it and why. If you suspect an ex-partner or someone you fear, talk to a victim advocate before confronting them, and consider an order of protection.
5. Check your phone too. Review unknown-tracker alerts and shared-location permissions, and look for apps a former partner may have installed.

If your concern is cameras rather than trackers, different rules apply; see our guide to surveillance camera laws for how video on private property is treated.

For the rules in every other state, see GPS Tracking Laws by State.

Sources

• MCA 45-5-220, Stalking, Montana Code Annotated
• MCA 46-5-110, location information privacy, warrant required for government access, Montana Code Annotated
• MCA 40-15-102, eligibility for an order of protection, Montana Code Annotated
• Montana Constitution, Article II, Section 10, right of privacy
• United States v. Jones, 565 U.S. 400 (2012), Legal Information Institute
• 18 U.S.C. 2261A, stalking, Legal Information Institute

Disclaimer: This article is for informational purposes only and is not legal advice. Statutes change and every situation is different. If you are dealing with tracking or stalking in Montana, contact a Montana attorney or local law enforcement. If you are in immediate danger, call 911.

More Montana Laws

• Montana Dashcam Laws
• Montana Data Privacy Laws
• Montana Drone Laws
• Montana Employee Monitoring Laws
• Montana Recording Laws
• Montana Restraining Order Laws

Frequently Asked Questions

Is it illegal to put a GPS tracker on someone's car in Montana?

Yes, if you do not own the vehicle and do not have the owner's consent. Montana prosecutes secret vehicle tracking as stalking under MCA 45-5-220 when it is part of a course of conduct that causes fear or substantial emotional distress. A first offense is punishable by up to a year in county jail and a $1,000 fine.

Can I put a tracker on my spouse's car in Montana?

If the car is titled in your name or jointly owned, ownership gives you a partial defense, but secret tracking during a separation or divorce can still support a stalking charge or an order of protection if it frightens your spouse. If the car belongs solely to your spouse, hidden tracking is treated the same as tracking a stranger. Family-law judges also weigh this conduct against you in custody and divorce cases.

Are AirTags illegal in Montana?

Owning and using an AirTag to find your own keys, luggage, or car is legal. Using one to secretly follow a person falls under the stalking statute's electronic monitoring language, exactly like a dedicated GPS unit.

Can my employer track my personal car in Montana?

Not without your consent, as a practical matter. No Montana statute squarely addresses employer GPS tracking, but the state constitution's explicit privacy right and the stalking statute make covert tracking of a personal vehicle legally risky. Employers should obtain written consent and limit tracking to work hours.

Can police track my car without a warrant in Montana?

Generally no. United States v. Jones makes installing a tracker and using it to monitor a vehicle's movements a Fourth Amendment search, and MCA 46-5-110 bars a government entity from obtaining the location information of an electronic device without a search warrant issued by a duly authorized court. The exceptions are narrow, covering a device reported stolen, an emergency call response, informed consent, and a life-threatening situation.

Does one hidden tracker count as stalking in Montana?

Placing a device once, by itself, does not complete the offense because stalking requires a course of conduct. But a tracker rarely stays a single act. Continuous location reporting over days or weeks, or a tracker combined with following, repeated calls, or showing up uninvited, gives prosecutors the repeated conduct the statute requires.

What should I do if I find a GPS tracker on my car in Montana?

Leave it in place or store it safely, photograph where it was mounted, and call local law enforcement to make a report. If you suspect a current or former partner, consider petitioning for an order of protection under MCA 40-15-102, which is free to file and can prohibit all surveillance.