Arizona tint law: where the windshield line is drawn
Arizona's window-materials law allows transparent material on the topmost portion of your windshield if its bottom edge is at least 29 inches above the undepressed driver's seat and it is not red or amber. Below that, the windshield has to stay clear: a transparent material may not alter its color or reduce its light transmittance. Front side windows with film need a light transmission of 33%, plus or minus 3%. Back side windows and the rear glass can be as dark as you want if the film stays within the reflectance limit, and the rear window is also exempt with outside mirrors on both sides. That is the short version of Arizona's window-materials law, and the part to watch is the windshield strip: where it may sit, and that the AS-1 mark can move when the glass is replaced.
How to find the AS-1 line on your own windshield
AS-1 is a glazing designation. You will usually see "AS1" stamped inside the monogram — the small etched block of manufacturer text in a lower corner of the windshield. The AS-1 line is something different: a short etched mark, notch, or arrow near the top edge of the glass, typically on both the driver and passenger sides, a few inches down from the roofline. Draw an imaginary horizontal line between those two marks and you have the AS-1 line. Arizona's window-materials law does not use that line. It measures the material's bottom edge from a point five inches in front of the bottom of the backrest, with the driver's seat in its rearmost and lowermost position and the vehicle on a level surface.
Two things complicate this in the real world. First, the dark ceramic band across the top of most windshields — the shade band, sometimes called the sunband or frit — is baked into the glass at the factory and is not tint. Second, not every windshield carries a visible AS-1 mark. If you cannot find one, the conservative approach is to treat the bottom edge of the factory shade band as your ceiling and confirm with the Arizona Department of Public Safety before an installer cuts film.
Arizona window tint law by the numbers
- Windshield: transparent material on the topmost portion only, bottom edge at least 29 inches above the undepressed driver's seat, not red or amber.
- Front side windows: light transmission of 33%, plus or minus 3%.
- Back side windows and rear window: any darkness.
- Reflectivity: side windows may not be more than 35% reflective, plus or minus 3%.
- Mirrors: one rear-window exemption needs outside mirrors on both sides.
- Medical exemption: Arizona provides for one, supported by a signed statement from a physician.
Notice what is not on that list: an exception for high-VLT "clear" ceramic film across the full windshield. It genuinely cuts heat, but the statute simply does not carve out an allowance below that top strip based on how light the film is. If you are considering it, go in knowing that.
Lower percentages mean darker film, so 20% film is darker than 35% and falls below the 33% front-window limit. Film that is darker than the law allows can draw a traffic stop and a citation.

