California's window tint rules depend on which windows you're tinting and how dark the tint is

California law sets specific limits on how dark window tint can be, measured as a percentage of light that passes through the glass. The rules are different for your front side windows, rear side windows, and rear window — and they're stricter than many other states. If your tint is darker than the law allows, you can receive a ticket, and the officer can order you to remove it.

The state measures tint darkness using Visible Light Transmission (VLT), which is the percentage of light that comes through the glass. A higher VLT percentage means lighter tint; a lower percentage means darker tint. California's limits are among the most restrictive in the country, so tint that's legal in Nevada or Arizona may not be legal here.

Key Takeaways

  • Front side windows must allow at least 70 percent of light through; rear and back windows can be any darkness.
  • Your windshield can have tint only on the top 4 inches, and it must not be reflective or metallic.
  • Medical exemptions exist for people whose skin conditions require protection from sunlight, but you need a signed letter from a licensed physician.
  • A tint violation is an infraction that can result in a fine and an order to remove the tint within a set timeframe.

Front windows: the 70 percent rule

Your front side windows — the ones next to the driver and front passenger — must allow at least 70 percent of light to pass through. This is California's strictest requirement and the one most people encounter when they want darker tint. A 70 percent VLT tint is quite light; it will reduce glare and heat but won't give you the dark, privacy-focused look that darker tints provide.

The 70 percent rule applies to both the driver's side and the front passenger window. If either window is darker than 70 percent VLT, you're in violation, even if the rest of your car is tinted legally. Many people don't realize how light 70 percent actually is until they see it installed, so ask the tint shop to show you samples before committing.

Rear and back windows: no limit

Once you move behind the front seats, California has no darkness limit. Your rear side windows and rear window can be tinted as dark as you want — even limo tint (nearly opaque) is legal. This is where people who want privacy or maximum heat reduction typically focus their tinting.

The reason for this difference is safety: California law assumes the driver needs to see clearly out the front to operate the vehicle safely, but passengers in the back don't affect the driver's visibility. So if you want dark tint, concentrate it on the rear half of your car.

Windshield tint and reflective rules

Your windshield can have tint, but only on the top 4 inches — the part above the steering wheel. This strip is called the sun visor area, and it's the only part of the windshield where tint is permitted. The tint in this area cannot be reflective or metallic, meaning it can't bounce light back or have a mirror-like appearance.

Many people don't realize they can tint the windshield at all, so this is one of the few places you can add tint without hitting California's limits. However, the tint shop must be careful to stay within the 4-inch boundary, or you'll have a violation that's visible to any officer.

Medical exemptions for sun-sensitive skin conditions

If you have a medical condition that requires protection from sunlight — such as lupus, porphyria, or severe photosensitivity — you may be able to tint your front windows darker than 70 percent. To use this exemption, you need a signed letter from a licensed physician stating that you have a medical condition requiring UV protection and that window tint is medically necessary.

You must carry this letter in your vehicle at all times. If an officer stops you for tint that's darker than 70 percent, you can show the letter as proof of your exemption. The letter alone doesn't prevent a stop, but it protects you from a citation if you can produce it. Some people laminate the letter and keep it in the glove box for quick access.

What happens if you get a tint ticket

A window tint violation in California is an infraction, not a misdemeanor. You'll receive a citation with a fine amount, which varies by county but typically ranges from $25 to $100 or more. The citation will also include an order to remove or lighten the tint within a specific timeframe — usually 30 days.

If you don't remove the tint by the important date, you can receive a second citation. Some people choose to fight the ticket in traffic court if they believe the tint is actually within legal limits, though this requires proof (usually a VLT measurement from a tint shop). If you remove the tint and provide proof to the court, you may be able to have the fine reduced or dismissed.

How to measure your tint before installation

Before you have tint installed, ask the shop what VLT percentage the film has. Reputable tint shops will tell you this number and explain how it compares to California law. If a shop can't or won't tell you the VLT, that's a red flag — they may not understand the law themselves.

Some shops offer to measure your existing tint with a light meter to see if it's legal. This is helpful if you inherited a car with tint already on it. If you're buying pre-tinted film online, the product listing should state the VLT percentage clearly. If it doesn't, contact the manufacturer before purchasing.

Frequently Asked Questions

Can I tint my front windows darker if I have a sunroof?

No. The 70 percent rule for front windows applies regardless of whether you have a sunroof. A sunroof doesn't change the legal limit for side window tint. If you want more sun protection, you can tint your rear windows as dark as you want, or use a sunroof shade.

Is 50 percent tint legal on my front windows?

No. Fifty percent VLT is darker than California's 70 percent limit for front side windows. You would need a medical exemption letter from a physician to use tint that dark on the front. Without the exemption, 50 percent tint on front windows is a violation.

What if I move to California with a car that has legal tint in another state?

You must comply with California law once you register your vehicle here. If your tint is darker than 70 percent on the front windows and you don't have a medical exemption, you'll need to remove or lighten it. California doesn't grandfather in tint that was legal elsewhere.

Can I get a medical exemption for cosmetic reasons or personal preference?

No. The exemption requires a diagnosed medical condition that makes sunlight exposure harmful to your health, documented by a licensed physician. Preference for privacy or appearance doesn't may have access to, and a letter from anyone other than a licensed doctor won't be accepted.

Do I need to register my tint with the DMV?

No. California doesn't require you to register or report window tint to the DMV. However, you must carry a medical exemption letter if you're using one, and you should be prepared to show it to an officer if stopped.