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. Both statutes carry a nine percent enforcement tolerance, which runs in one direction only: it is an allowance below the legal floor, not a margin above it.

What is the legal tint limit in South Dakota?

South Dakota sets its legal tint limits under SDCL 32-15-2.4 (front side windows) and SDCL 32-15-2.5 (rear windows). 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.

One notable feature of South Dakota law is its enforcement tolerance. Both SDCL 32-15-2.4 and SDCL 32-15-2.5 prohibit tint below their stated limits "with an enforcement tolerance of nine percent." That tolerance runs one way. It gives enforcement room below the statutory floor, so as a practical matter a front side window draws a citation when it reads below about 26%, and a rear window when it reads below about 11%. A reading above the floor is lighter than the law requires and is never a violation, so there is no upper edge to the tolerance. The legal standards remain 35% and 20%; the nine percent is an enforcement allowance, not permission to install darker film.

Windshield tint rules in South Dakota

SDCL 32-15-2.9 governs the windshield. No sunscreening device may be placed on or affixed to a windshield so as to obstruct or reduce the driver's clear view through the windshield, and no film may extend downward beyond the AS-1 line or more than the lowest point of the sun visor. In practice that is the sun visor or eyebrow strip along the top of the glass that most states permit. No film may run below that boundary onto the main driving field of the windshield.

South Dakota's window tint statutes (SDCL 32-15-2.4 through 32-15-2.10) do not set a separate reflectivity percentage the way some states do. They are not silent on mirrored glass, though. Both 32-15-2.4 and 32-15-2.5 name one-way glass alongside film and other applications as regulated equipment, and 32-15-2.9 bars any windshield sunscreening device placed so as to obstruct or reduce the driver's clear view. A mirrored or metallic-look film is therefore not automatically permitted, and one that interferes with the driver's view through the windshield is prohibited.

Drivers who want a UV-blocking film on the windshield for sun protection should make sure it stays above the AS-1 line and does not extend below the sun visor's lowest point. Films marketed as clear or barely visible that block UV light while maintaining at least the required VLT in the side and rear windows are generally acceptable.

Medical exemptions in South Dakota

South Dakota's window tint statutes do not set out a medical exemption. Sections 32-15-2.4 through 32-15-2.10 cover the VLT limits, definitions, manufacturer certification, the windshield rule, and meter testing, and none of them creates a physician-certification process or an in-vehicle documentation procedure that would allow darker tint.

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. Under SDCL 32-15-2.10, that testing equipment must be used according to the meter manufacturer's procedure, and the officer must note the meter's serial number and the date the meter was certified on any citation written under the tint sections. The nine percent enforcement tolerance then applies below the limit, so a front side window is cited on a reading under roughly 26%.

South Dakota law does not require a physical compliance sticker on each tinted window. Instead, SDCL 32-15-2.7 requires each film manufacturer to certify to the South Dakota Department of Public Safety that its film meets the state's light-transmission standards. Ask your installer which manufacturer's certified film they are using, and 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.

A meter reading is the practical first line of verification during a stop, since there is no sticker for an officer to check. The enforcement tolerance does not mean you can install film 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 32-15-2.4 (front side windows) and 32-15-2.5 (rear windows). 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, documentation of the film's VLT rating from your installer and a current meter reading can support your case, and SDCL 32-15-2.10 requires the citation itself to identify the meter used and the date it was certified.

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 leave a margin above the floor for meter and installation variation. 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 and use film from a manufacturer that has certified compliance with the state's light-transmission standards under SDCL 32-15-2.7.

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.

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.

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.

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