South Dakota Window Tint Laws (2026): Legal VLT Limits
South Dakota Window Tint Laws (2026): Legal VLT Limits
South Dakota requires front side windows to allow at least 35% visible light transmission (VLT), while back side windows and the rear window must allow at least 20% VLT. The state applies an unusually broad plus or minus 9% measurement tolerance, which affects how law enforcement reads VLT meters on the road.
What is the legal tint limit in South Dakota?
South Dakota sets its legal tint limits under SDCL 32-15-3.2. Front side windows must let in at least 35% of visible light. Back side windows and the rear window must each let in at least 20% of visible light. A higher VLT percentage means lighter tint; a lower VLT percentage means darker tint. So a window rated at 35% lets in more light than one rated at 20%.
South Dakota does not create a separate rule for sedans versus multipurpose vehicles (SUVs, vans, trucks) on the windows behind the driver. The 20% VLT floor applies to all vehicle types on the back side and rear glass.
| Window | Minimum VLT | Applies To |
|---|---|---|
| Front side windows | 35% | All vehicles |
| Back side windows | 20% | All vehicles |
| Rear window | 20% | All vehicles |
| Windshield | Non-reflective strip above AS-1 line or top 5 inches only | All vehicles |
One notable feature of South Dakota law is its measurement tolerance. The state applies a plus or minus 9% variance when officers use a VLT meter to test a window. In practical terms, a window that is installed to exactly 35% might read as low as 26% or as high as 44% on a meter, and the same tolerance applies to the 20% rear limit. This is much wider than the plus or minus 3% tolerance used in states like Alabama or Alaska.
Windshield tint rules in South Dakota
South Dakota allows non-reflective tint on the windshield only in the area above the AS-1 line or within the top 5 inches from the top edge of the glass, whichever comes first. This is the standard sun visor or eyebrow strip that most states permit. No tint may extend below that line onto the main driving field of the windshield.
Reflective or mirrored tint is prohibited on all windows in South Dakota, including the windshield strip. The statute does not specify particular banned colors, but the reflectivity ban effectively rules out any chrome, mirror, or highly metallic-finish film anywhere on the vehicle.
Drivers who want a UV-blocking film on the windshield for sun protection should make sure it is non-reflective and stays within the top 5-inch strip. Films marketed as clear or barely visible that block UV light but maintain at least the required VLT in the side and rear windows are generally acceptable so long as they are not mirrored.
Medical exemptions in South Dakota
South Dakota's dossier does not specify a medical exemption process in the publicly available statutory sources. The state code at SDCL 32-15-3.2 governs tint requirements, but a clearly defined medical exemption procedure with physician-certification and an in-vehicle documentation requirement has not been confirmed for South Dakota at this time.
If you have a documented medical condition (such as lupus, photosensitivity, or a condition that makes exposure to sunlight medically dangerous), consult your physician and contact the South Dakota Department of Public Safety or a licensed South Dakota attorney before installing tint that exceeds the standard legal limits. Some law enforcement agencies will exercise discretion with supporting medical documentation, but without a statutory exemption on the books, that protection is not guaranteed.
How tint is measured and certified in South Dakota
Law enforcement in South Dakota uses a photoelectric VLT meter to test window tint during a traffic stop. The meter sends a beam of light through the glass and measures the percentage that passes through. South Dakota's tolerance of plus or minus 9% is among the widest in the country. For reference, a window installed at exactly 35% could measure anywhere from 26% to 44% on a meter and still arguably be within the tolerance band.
A compliance sticker is required on each tinted window. Manufacturers and sellers of tint film are responsible for certifying that the film they install meets state requirements. When you have tint installed, your installer should provide and affix this certification sticker. Keep any documentation from your installer that records the VLT rating of the film, as that paper trail can be helpful if you receive a citation and want to contest it.
The sticker serves as the first line of verification during a stop. An officer who sees a properly placed sticker and meter reading within the tolerance band should not issue a citation, but the broad tolerance does not mean you can install film well below the legal limit and rely on the tolerance to protect you.
Penalties for illegal tint in South Dakota
Violating South Dakota's window tint law is classified as a Class 2 misdemeanor under SDCL 32-15-3.2. A Class 2 misdemeanor in South Dakota carries a potential sentence of up to 30 days in county jail and a fine of up to $500. In practice, tint violations are typically resolved with a fine and a requirement to remove or replace the film, not with jail time. However, the misdemeanor classification means the violation creates a criminal record rather than just a traffic infraction.
If you receive a citation for illegal tint, you generally have two options: pay the fine (which constitutes a guilty plea in most South Dakota jurisdictions) or contest the citation at a hearing. If you contest it, having documentation of the film's VLT rating from your installer and a current meter reading can support your case, especially given the wide measurement tolerance in the law.
Repeat violations are still separate misdemeanor charges, so persistent non-compliance can accumulate.
If you want to tint your windows in South Dakota
South Dakota's rules are straightforward once you know the numbers. Here is what to do before having tint installed:
Choose a VLT rating at or above the legal limit with some buffer. For front side windows, 35% is the legal minimum. Consider installing at 40% to give yourself a comfortable margin inside the tolerance range. For back side and rear windows, the 20% minimum allows fairly dark tint. A 20% or 25% film is very dark but legal if properly installed.
Use a reputable, licensed installer who is familiar with South Dakota law. A good installer will know the correct VLT limits, use film that has been tested to those specs, and affix the required compliance sticker on each window.
Keep a copy of your installer's receipt or certificate showing the VLT percentage of the film. Store it in the glove box along with your registration and insurance. If you are stopped, presenting this documentation immediately demonstrates good faith compliance.
Avoid reflective or mirrored film on any window. Even if the VLT is technically within range, a mirrored appearance violates a separate part of the statute.
If you are considering tint for medical reasons and the standard limits are not dark enough to address your condition, contact a South Dakota attorney or the Department of Public Safety before proceeding with a non-compliant installation.
This article is general legal information, not legal advice. Window tint limits vary by state and change, and enforcement depends on local practice and your specific vehicle. For a definitive answer, check your state DMV or consult a local attorney.
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Sources
- South Dakota Codified Laws 32-15-3.2: sdlegislature.gov/Statutes/32-15
For the complete picture of window tint rules across all 50 states, see the Window Tint Laws hub.
South Dakota also regulates what you can mount on your windshield and what can obstruct your view from inside the vehicle. See South Dakota Windshield Mounting Restrictions for those rules.