Tint law confuses drivers here more than almost anywhere else in the state. The rules themselves are not complicated. The problem is that the Red River is a state line, and it is completely normal in this metro to live on one side of it and get your car worked on from the other.
The short version
- North Dakota: 35% VLT on every window except the windshield. Windshield stays at 70% or higher, with non-reflective film permitted above the AS-1 line.
- Minnesota: 50% VLT on side and rear windows, with a 3% measurement tolerance. No light-reducing material on the windshield at all.
Which one applies to you follows your registration, not your driveway.
What North Dakota actually allows
This is where a lot of articles still get it wrong, including ones online today. North Dakota does not allow darker film on the back glass than on the front doors. The statute sets a single floor of 35% VLT for every window except the windshield, front and rear alike. There is no darker rear allowance. The windshield has to stay at 70% or higher, with non-reflective film permitted above the AS-1 line.
That 35% figure is also recent. HB 1340 took effect on August 1, 2025 and lowered the previous 50% floor. Plenty of tint-law aggregator sites still print the old number, and several still describe an unlimited rear allowance that has never existed in this state. If you want to check it yourself, read NDCC 39-21-39 rather than a comparison chart.
What Minnesota allows
Minnesota runs 50% VLT on side and rear windows, with a 3% measurement tolerance, and permits no light-reducing material on the windshield at all. Pickup rear windows, the glass behind the driver in vans, hearses and limousines are exempted. A medical exemption exists, but it requires a physician's statement naming a minimum transmittance, and it expires within two years.
Why the river matters
Minnesota is the stricter state on front side windows: 50% against North Dakota's 35%. That single gap is what catches people. A shade that is fine on a North Dakota plate is a fix-it ticket on a Minnesota plate, even when both cars are parked in the same Fargo driveway. What governs your vehicle is the state it is registered in.
Most metro areas never have to think about this, because most metro areas sit entirely inside one state and a driver can cross town all day without crossing a legal line. Here, living in Moorhead and working in Fargo is ordinary, two neighbors on the same block can be under different tint limits depending on where their plates were issued, and a shop on either bank of the river will see both situations in the same week.
How VLT is measured
VLT stands for visible light transmission: the share of light that passes through the glass and the film together. Lower number, darker window. Two things follow from that. Your factory glass already has a VLT of its own, usually somewhere in the high seventies to low nineties, so the film you add is not the only variable in the final reading. And enforcement is done with a meter held against the window, which reads the finished assembly rather than the number printed on the film box.
This is also why the limits get tighter the closer a window sits to the driver. Regulators want an officer to be able to see into a vehicle at a stop, other drivers to be able to read a hand signal or catch your eye at a four-way, and enough outward visibility left for you at night in the rain. Rear glass is where privacy and heat control are allowed to weigh more heavily, which is why so many states permit darker film back there. North Dakota happens to be one that does not.
Windshields, medical exemptions, and vehicle class
Both states treat windshields differently from side glass, and both have a medical exemption process for documented light sensitivity. Those carve-outs carry their own paperwork and their own expiry. If you think you might qualify, raise it before the appointment rather than after.
Vehicle class matters too. Trucks, vans, and multi-purpose vehicles do not always fall under the same rear-window treatment as a passenger car. Tell us what you drive when you book so we apply the right category instead of a passenger-car default.
Buying a used vehicle that is already tinted
Existing film is worth checking rather than assuming. Film that was compliant when it went on, film installed while the car was registered somewhere else, or film a previous shop simply guessed at can all leave you holding a violation you did not create. We can meter what is on the glass now and tell you where it lands against the current limits, plus what removal would involve if it comes to that.
What happens if the tint is over the line
- An equipment violation at a routine stop.
- A fix-it order requiring removal or replacement.
- Paying twice: once to take off film you already bought, once to do it again correctly.
- Removal that is genuinely unpleasant on rear glass, where the defroster lines run through the film and impatience costs you a defroster.
Reasons to tint that have nothing to do with darkness
The legal conversation tends to swallow the practical one. Tint cuts cabin heat on the kind of July afternoon where a dark interior becomes genuinely unpleasant, blocks a large share of the UV that fades upholstery and dries out dash plastics over years of exposure, takes the glare down on a long flat highway run, and gives you some privacy for whatever is sitting on the back seat.
Almost none of that requires going dark. Modern ceramic and carbon films do their heat rejection through the infrared spectrum instead of through visible light, which means a compliant 35% or 50% film can outperform a cheap dyed film several shades darker. If your goal is a cooler car, shade is the wrong dial to be turning.
How we handle it
Before recommending a shade we confirm the registration state and apply the limit window by window rather than averaging across the vehicle. Want the darkest shade that is still road-legal? Say so and we will get as close to the line as the statute allows, then tell you the exact VLT that went on each piece of glass so you have the answer if anyone asks for it.
What we will not do is tell you that you will never be stopped. Meters vary, film drifts a little as it ages, and legislatures change numbers. What we control is installing to the current limit for your registration state and documenting it.
Both legislatures revise these statutes periodically. Treat this article as a guide rather than a legal reference. Figures above were verified against NDCC 39-21-39 and Minn. Stat. 169.71 in July 2026.
Frequently asked questions
I live in Moorhead but my car has North Dakota plates. Which limit applies?
Tint limits follow where the vehicle is registered and primarily driven rather than where it is parked. Individual situations vary, so we confirm it with you at the appointment.
What if I re-register the car in the other state later?
Have the film rechecked against the new state's limits. Going from a North Dakota plate to a Minnesota one is the direction that usually creates a problem, since 35% film does not meet a 50% requirement.