You can tint the front windshield in California only along a narrow strip at the very top. Any aftermarket tint applied to the main viewing area of the windshield is illegal, and the top strip itself has to meet specific size, color, and reflectivity rules under Vehicle Code Section 26708.
How Much of the Windshield You Can Tint
The legal strip is defined by a measurement from inside the car, not from the top of the glass. The bottom edge of the tint must sit at least 29 inches above the driver’s seat, with the seat set to its lowest and rearmost position.1California Legislative Information. California Code VEH – Section 26708 On a typical sedan or coupe, that leaves a thin band across the top. A truck or SUV with a taller windshield may get a slightly wider band, but the 29-inch floor is the same no matter what you drive.
Tint shops often shorthand this as “the top 4 or 5 inches.” That’s roughly right for an average car, but it isn’t the rule. If your vehicle has an unusually tall or steeply raked windshield, measure from the seat.
Manufacturers mark this boundary on the glass itself. The AS-1 line etched near the top of the windshield shows where the federally required 70 percent light transmission zone ends and where a darker shade band is permitted.2National Highway Traffic Safety Administration. Interpretation Letter 11-000697 – FMVSS 205 Anything below that line, in the area you actually look through while driving, has to stay clear.
What the Strip Itself Has to Look Like
Even within the allowed area at the top, the film has to meet four conditions. It cannot be red or amber. It cannot contain opaque lettering. Any lettering on it cannot distort your vision. And it cannot reflect sunlight or headlight glare any more than bare glass would.3California Legislative Information. California Code VEH 26708 – Windshields and Mirrors
Federal Motor Vehicle Safety Standard No. 205 backs this up by requiring at least 70 percent visible light transmission through any glass area used for driving visibility, which includes the windshield below the AS-1 line.4Federal Register. Federal Motor Vehicle Safety Standards – Glazing Materials Factory windshields are built to meet that threshold; adding aftermarket film to the main viewing area almost always pushes the reading below it.
Medical Exemptions That Change the Windshield Rule
California allows two medical exemptions that can apply to the windshield, and each has strict conditions.
Clear UV-Blocking Film
A driver with a UV-sensitive medical condition can apply clear, colorless, transparent film to the windshield if the film blocks ultraviolet A rays. You need a certificate from a licensed dermatologist, not a general physician. The film must have at least 88 percent visible light transmission, and the finished glass (film plus windshield) must still meet the federal 70 percent VLT standard.1California Legislative Information. California Code VEH – Section 26708 This exemption does not allow any visible darkening. If the film tears or bubbles enough to obstruct clear vision, you have to remove or replace it right away.
Removable Sun Screening Devices
A separate exemption covers removable sun screening devices for drivers or front-seat passengers with a medical need for shade. This one applies to front side windows rather than the windshield. It requires a letter from a licensed physician, surgeon, or optometrist, and the device must be easily removable. If transparent, it must be green, gray, or neutral smoke, with at least 35 percent light transmission and no more than 35 percent reflectivity on either surface.5California Legislative Information. California Code VEH – Section 26708.2 These devices cannot be used at night.
If you rely on either exemption, keep the physician’s letter or dermatologist’s certificate in the vehicle. Officers expect to see it at the stop, and without it you have no defense against a citation in the moment.
What Happens If You Get Cited
California Highway Patrol officers and local police use handheld tint meters to check visible light transmission during traffic stops and at safety checkpoints. The meter reading determines whether you get a ticket. You can request a retest with a calibrated meter, but the initial reading carries weight.
A tint violation under Section 26708 is a correctable offense, so the citation is a notice to correct rather than a standard ticket.6California Courts. What to Do If You Got a Fix-It Ticket You get a reasonable time to fix the problem, which cannot exceed 30 days.7California Legislative Information. California Vehicle Code VEH 40610 – Correctable Violations To clear it, remove or replace the offending tint, have a law enforcement officer or authorized inspection station sign off, and bring the proof to the court clerk with a $25 processing fee per violation.8California Legislative Information. California Code VEH 40611 – Correctable Violation Fees
Ignore the deadline and the cost climbs. An uncorrected fix-it ticket converts to a standard infraction with higher fines. Repeated violations can be treated as persistent neglect, which lets officers skip the correctable process and write a regular citation from the start.7California Legislative Information. California Vehicle Code VEH 40610 – Correctable Violations
There is also an insurance angle worth knowing. A corrected fix-it ticket is unlikely to affect your rates, but if you are in an accident with illegally dark tint, your insurer may refuse to cover the cost of replacing the tinted windows even while paying for other damage. Some insurers treat undisclosed modifications as a coverage gap.
The Rest of the Vehicle Follows Different Rules
The strict windshield limit does not carry over to every window. Front side windows are treated almost as strictly and generally cannot be tinted below the federal 70 percent VLT threshold without a medical exemption. Side windows behind the driver are exempt from Section 26708’s restrictions entirely, so those can be tinted as dark as you want. The rear window can also be tinted, provided the vehicle has outside mirrors on both sides that give the driver a view at least 200 feet behind the car.1California Legislative Information. California Code VEH – Section 26708 Most modern vehicles satisfy that condition from the factory.