North Dakota Tint Laws: Window Limits, Penalties, and Exemptions
Window tint can reduce glare, limit sun exposure, and make a vehicle more comfortable, but North Dakota regulates how much light tinted windows may block. The rules depend on the window’s position, and medical exemptions may apply in limited circumstances. Knowing the state’s visible light transmission requirements—and checking that a film installation meets them—can help drivers avoid a citation and the expense of replacing noncompliant tint.
North Dakota Window Tint Limits at a Glance
North Dakota’s window tint law is set out in North Dakota Century Code Section 39-21-39. It regulates sunscreening material based on the amount of visible light that passes through the glass and material together. This measurement is called visible light transmission, or VLT. A higher VLT percentage means more light gets through and the tint appears lighter.
| Window location | General limit |
|---|---|
| Windshield | Tint is generally limited to the uppermost portion, subject to applicable safety-glazing requirements. |
| Front side windows | At least 50% VLT |
| Rear side windows | At least 35% VLT |
| Rear window | At least 35% VLT |
These figures are minimum light-transmission levels, not the percentage of light the film blocks. For example, a front-window film labeled 50% VLT is designed to let about half the visible light pass through. Actual results can vary because the factory glass itself may already be tinted. Drivers should ask the installer to measure the finished glass-and-film combination rather than rely only on the product label.
Rules and enforcement can depend on a vehicle’s details and the applicable statutory language. Before installing tint, drivers should verify current requirements with the North Dakota Department of Transportation or a qualified installer familiar with state law. The statute, rather than a shop’s general tint chart, is the controlling source.
Windshield Tint Rules
North Dakota’s law does not treat the windshield like the side and rear windows. The windshield is an essential part of a driver’s forward view, so added film is generally restricted to the uppermost area. A tint strip should not extend into the driver’s required field of vision or interfere with safety equipment, including cameras and sensors mounted near the windshield.
Factory-installed shading and aftermarket film are not necessarily treated the same way. Drivers should check the vehicle manufacturer’s markings and consult the state statute before adding windshield film. A shop’s claim that a strip is “legal” does not guarantee compliance if it is too wide, too dark, or obstructs the driver’s view.
What VLT Means in Practice
VLT is the percentage of visible light that travels through a window. It is not the same as tint darkness as it appears to the eye. Two films with the same VLT can look different because of color, reflectivity, glass composition, and lighting conditions. A vehicle’s original glass may also reduce light before any aftermarket film is installed.
- Higher VLT: More visible light passes through the window.
- Lower VLT: Less visible light passes through, so the window appears darker.
- Combined measurement: Compliance is assessed through the glass and applied film together, not by treating the film’s advertised rating as the final result.
Because measurement tools and conditions can affect readings, an installer’s estimate is not a substitute for official enforcement. A professionally installed film that appears close to the legal threshold may still test below it. Choosing a tint with a safety margin can reduce that risk.
Reflectivity, Color, and Other Tint Considerations
VLT is only one factor in vehicle-window compliance. The law also addresses sunscreening devices and their use with automotive glazing. Highly reflective films, unusual colors, or materials that interfere with visibility can create issues even when a window appears to meet a light-transmission figure. Drivers should confirm that a product is intended for automotive use and meets applicable federal and state safety requirements.
Window tint must not obstruct the driver’s view or interfere with required equipment. Tint applied over a camera, sensor, or other safety feature can affect performance. Drivers should also avoid placing stickers or other materials where they could block required sightlines.
It is wise to ask a tint shop for the film’s technical specifications, a written description of the work, and a post-installation VLT measurement. Drivers should be especially cautious with very dark films and with older vehicles whose glass already has a noticeable factory tint.
Medical Exemptions for Darker Tint
North Dakota law provides a medical exemption for qualifying drivers or passengers who need additional protection from sunlight. The exemption is not automatic: a medical need must meet the requirements in Section 39-21-39, and the required documentation must be available as the law specifies.
People considering a medical exemption should review the current statute and confirm the process with the appropriate state agency before installing tint that falls below the ordinary limits. They should ask what medical documentation is accepted, which windows may be covered, and whether proof must be carried in the vehicle. A medical recommendation alone should not be assumed to authorize any shade on every window.
Drivers should keep exemption documents current and accessible during travel. If the vehicle changes ownership or the medical circumstances change, the exemption’s continued applicability may also need to be checked. The safest approach is to confirm the requirements directly rather than depend on a tint installer’s interpretation.
Penalties and Enforcement
A vehicle with tint that does not meet state requirements may be stopped or cited. The exact outcome can depend on the circumstances, the applicable violation, and the court or enforcement process. Drivers should not assume that a tint citation carries a single statewide amount in every situation; the current statute and official fine schedule are the appropriate places to verify potential costs.
Beyond a fine, noncompliant tint can mean paying to remove or replace the film and then arranging a reinspection or providing proof of correction if required. A citation can also create inconvenience during a traffic stop, particularly when a driver cannot show a valid medical exemption. Addressing the issue promptly is generally less costly than continuing to drive with tint that may be unlawful.
Enforcement may involve a visual assessment or a light-transmission measurement. Appearance alone is not a reliable way to establish VLT, since lighting, glass, and film can make a window look lighter or darker than it measures. If a driver believes a reading or citation is incorrect, the driver should follow the instructions on the citation and use the available review process.
How to Check Whether a Vehicle’s Tint Is Legal
- Identify each window. Separate the windshield, front side windows, rear side windows, and rear window because different requirements may apply.
- Ask for a combined VLT measurement. Have a qualified shop measure the glass and film together with a calibrated meter.
- Check the windshield installation. Confirm any added strip stays within the permitted area and does not obstruct vision or vehicle equipment.
- Review documentation. Keep the installer’s receipt and measurement information, and carry any legally required medical-exemption paperwork.
- Confirm current rules. Consult the North Dakota Century Code or the appropriate state agency before relying on a chart, online forum, or out-of-state installer.
A measurement taken before installation can be useful, but it does not establish the final VLT after film is applied. If the glass is already tinted, the completed-window reading is especially important. For used vehicles, a buyer should check the tint before purchase rather than assume it was installed legally.
Common Misunderstandings About North Dakota Tint Laws
“A 50% tint blocks half the light.”
Not necessarily. A 50% VLT product is intended to transmit about half the visible light, not block only half the light regardless of the original glass. The final reading depends on the combined glass and film.
“If a shop installs it, it must be legal.”
Installation does not transfer responsibility for compliance. A shop may use a film that is legal on one window but not another, or the vehicle’s factory glass may change the final measurement. Drivers should request measurements and verify the applicable limits.
“Medical paperwork means any tint is allowed.”
A medical exemption is governed by statutory conditions. It should not be treated as a blanket waiver without confirming the specific documentation, vehicle, and window requirements.
“Tint rules are the same in every state.”
They are not. A vehicle that was legal where it was purchased or previously registered may not meet North Dakota’s requirements. Drivers moving to the state or bringing in a vehicle should check North Dakota’s limits before relying on another state’s standards.
Practical Steps Before Installing Tint
Before booking an installation, drivers can ask the shop to identify the legal VLT for each window, explain how factory glass affects the finished reading, and provide a measurement after installation. They should also ask whether the chosen film is designed for automotive safety glazing and whether any warranty depends on a particular installation or care process.
After installation, drivers should inspect visibility in daylight and at night. Even legal tint can make it harder to see pedestrians, cyclists, or vehicles in low-light conditions, especially through rear windows. Good visibility is a safety priority as well as a legal one.
For official verification, consult the current text of North Dakota Century Code Chapter 39-21 and contact the North Dakota Department of Transportation or local law enforcement with questions about a specific vehicle. Checking the law before installation—and measuring the finished windows afterward—offers the clearest path to compliant tint.