How Tinted Windshields Work and When They’re Legal in Wisconsin

Tinted windshields can enhance your driving experience by reducing glare, blocking harmful UV rays, and helping keep your vehicle cooler during hot weather. But many Wisconsin drivers are unsure whether windshield tinting is legal, how it works, or what type of tint their vehicle may already have.

At Affordable Auto Glass WI, we often help drivers understand the difference between factory tint, aftermarket film, and legal limits for windshield tinting. In this blog, we explain how tinted windshields work, what benefits they offer, and what the law allows in Wisconsin.

What Is a Tinted Windshield?

A tinted windshield refers to a front glass panel that has some level of darkened material or treatment to reduce sunlight transmission. While most windshields are not heavily tinted, they can include:

1. Factory Tint

Factory windshield tinting is often very light and built into the glass itself. It typically has a slight green or blue hue to reduce glare and filter ultraviolet (UV) rays. This tint is part of the glass and cannot be removed.

2. Aftermarket Tint Film

Aftermarket tinting involves applying a film to the inside of the windshield. While common on side and rear windows, adding aftermarket film to a windshield is highly regulated and often illegal depending on the coverage and darkness.

3. UV and Infrared Coating

Some newer or high-end vehicles come with invisible coatings that block infrared heat and 99 percent of UV rays without noticeably darkening the glass. These tints are legal and often found on luxury and electric vehicles.

Benefits of Tinted Windshields

Even a lightly tinted windshield can provide major advantages:

• UV Protection: Blocks harmful ultraviolet rays that cause interior fading and skin damage
• Glare Reduction: Helps reduce eye strain during bright daylight or night driving
• Heat Rejection: Keeps your vehicle cooler by blocking solar heat
• Improved Visibility: Reduces glare from headlights and reflective surfaces

Many vehicles come with factory-tinted windshields that offer these benefits while remaining compliant with local laws.

What Does Wisconsin Law Say About Windshield Tinting?

In Wisconsin, windshield tinting is legal with very specific limitations. According to state law:

• No tint is allowed below the AS-1 line, which is a line marked by the manufacturer near the top of the windshield
• Non-reflective tint is permitted above the AS-1 line only
• Full windshield tinting is not legal, even with light shading, unless you have a valid medical exemption

This law ensures the driver’s full field of view is unobstructed while still allowing some sun protection at the very top of the glass.

What Is the AS-1 Line?

The AS-1 line is usually etched into both sides of your windshield about five inches from the top. This mark indicates how far down non-reflective tint can be legally applied. Anything below this line is subject to citation or required removal under Wisconsin traffic laws.

Are There Medical Exemptions?

Yes. Wisconsin drivers with documented medical conditions that require reduced exposure to sunlight or UV rays can apply for a tint exemption. If approved, this allows for darker tinting than the law typically permits, including for the windshield. The exemption documentation must be kept in the vehicle at all times.

Factory Tint vs. Aftermarket Tint

Many drivers confuse factory tinting with aftermarket tint film. Here is how they differ:

If your vehicle already has factory tint on the windshield, you likely do not need any additional treatment unless you are looking for enhanced UV or heat protection with a clear film.

A tinted windshield can offer protection and comfort, but it must be installed legally to avoid fines and maintain safety. In Wisconsin, tinting is only allowed above the AS-1 line unless you qualify for a medical exemption. Understanding the differences between factory tint and aftermarket film can help you stay within the law and make the right choice for your vehicle. Source: Wisconsin Department of Transportation – Window Tinting Regulations

Tinted Windshields Services by Affordable Auto Glass

At Affordable Auto Glass WI, we offer expert advice and high-quality replacement glass that meets all local tint laws. If your windshield is cracked, needs replacement, or if you want to upgrade to UV-protected glass, give us a call today. We are proud to serve Nashotah and surrounding communities with reliable, local service.

At Affordable Auto Glass WI, we help drivers understand what type of tint is already present on their windshield and whether it complies with Wisconsin law. We provide:

Affordable Auto Glass provides expert mobile auto glass repair and replacement across Wisconsin, offering fast, reliable service for windshields, windows, mirrors, and ADAS recalibration right at your location.