Short answer: In California, the front side windows must let in at least 70% of visible light (70% VLT) measured with the glass and film together. The rear side windows and the back window can be any darkness, and the windshield can only carry a non-reflective strip across the top 4 inches. Red, amber, blue and mirrored films are not allowed.
On this page
- What VLT actually means
- Legal tint limits by window
- The 70% trap: combined VLT
- Colors and reflectivity that are banned
- Fines and fix-it tickets
- Medical exemptions
- The setup most drivers choose
- How to check your own tint
- California vs. nearby states
- Medical exemptions
- FAQs
1. What VLT actually means
Every tint law in the United States is written around one number: Visible Light Transmission (VLT). It is the percentage of visible light that passes through your window. The rule people get backwards is the direction of the scale.
70% VLT
Almost clear. Roughly what factory glass looks like. This is California’s front-window floor.
35% VLT
The popular “medium” film. Legal on front windows in many states โ not California.
5% VLT
Limo dark. Legal in California on rear glass only.
Lower number = darker tint. So a 5% film is far darker than a 50% film, even though 50 is the bigger number.
70% VLT โ front side windows (legal)light
35% VLT โ front side windows (illegal in CA)medium
5% VLT โ rear glass onlylimo dark
2. Legal tint limits by window
California applies the same standard to every passenger vehicle โ sedan, SUV, minivan or pickup. There is no separate “SUV rule” the way several other states have.
| Window | Legal limit | Status |
|---|---|---|
| Windshield | Non-reflective strip on the top 4 inches only | Restricted |
| Front side windows | 70% VLT minimum (glass + film combined); aftermarket film alone must pass more than 88% of light | Strict |
| Rear side windows | Any darkness | Open |
| Rear window | Any darkness, if the car has working mirrors on both sides | Open |
| Reflective / mirrored film | Not permitted on side windows | Banned |
| Red, amber, blue film | Not permitted | Banned |
3. The 70% trap: combined VLT
This is where most citations come from, and it catches drivers who thought they bought a legal film.
The measurement is not film-only. A CHP officer’s meter reads your window as it sits in the door โ factory glass plus whatever film is on it. Modern factory glass is already around 75โ80% VLT before anything is installed.
Run the math and the problem becomes obvious. Factory glass at 76% VLT with an 88% film gives you roughly 67% combined โ under the limit, even though both numbers individually sound high. That is exactly why the statute asks for film that transmits more than 88% of light on its own: it leaves enough headroom for the glass underneath.
Practical takeaway: on the front doors, ask the installer to meter your glass before choosing a film, and meter the window again after installation. A ceramic film in the 80โ90% VLT range still rejects serious heat and blocks UV while staying on the right side of 70%.
4. Colors and reflectivity that are banned
Darkness is only half the law. Two other restrictions apply regardless of VLT:
- Color:ย red, amber and blue films are prohibited. Side windows are expected to stay colorless.
- Reflectivity:ย tint that is more mirror-like than ordinary glass is not allowed. That rules out most heavily metallized films.
There is also paperwork. Film manufacturers must certify the products they sell in California, and drivers are expected to keep that certificate in the vehicle.
5. Fines and fix-it tickets
Illegal tint is an equipment violation, not a moving violation, so it does not add points to your license. What it does add is cost and hassle.
What a stop typically looks like: the officer meters the front windows, writes a correctable “fix-it” citation, and you are required to remove the film and have the correction signed off. First-offense fines commonly land in the $25โ$197 range, with repeat offenses running higher. On top of that you pay twice for tint โ once to install it, once to strip it.
6. The setup most drivers choose
Because the rear glass has no darkness limit, there is a standard compromise that gives you privacy without exposing you to a citation:
- Meter the factory glassย on your front doors before buying anything.
- Front sides:ย a clear or near-clear ceramic film, usually 80โ90% VLT, for heat and UV rejection without visible darkening.
- Rear sides and back glass:ย go as dark as you like โ 20%, 15%, even 5% limo is legal on a passenger car.
- Windshield:ย a non-reflective strip across the top 4 inches, or a clear 70%+ VLT ceramic film across the full glass.
- Keep the film certificateย in the glovebox with your registration.
From outside, a dark rear paired with clear-ceramic fronts reads as a uniformly tinted car. From inside, you keep the visibility the law is actually trying to protect.
7. How to check if your own tint is legal
You don’t need a professional meter to get a reasonable read before you drive anywhere near a checkpoint.
- Ask your installer for the combined VLT reading, not just the film’s box rating โ a reputable shop will meter the finished window and hand you a printout.
- Look at daytime visibility.ย At 70% VLT you should be able to see a driver’s facial features clearly through the front glass from outside. If the window looks noticeably shaded, that’s a warning sign.
- Check for color or shimmer.ย Any red, amber, blue or mirror-like sheen on the front or rear side windows fails regardless of VLT.
- Confirm the windshield strip.ย Measure from the top โ tint below 4 inches from the top edge (or below the AS-1 line) is not allowed.
- Keep the film certificateย the shop gives you; it’s the paperwork an officer may ask for.
8. How California compares to nearby states
Tint rules vary a lot state to state, which is worth knowing if you split time between California and a neighbor.
| State | Front side VLT minimum | Rear side VLT minimum |
|---|---|---|
| California | 70% | Any |
| Nevada | 35% | Any |
| Arizona | 33% | Any |
| Oregon | 35% | Any |
California’s 70% front-window floor is one of the strictest in the country โ most neighboring states allow a visibly darker film on the front doors.
9. Medical exemptions
California does allow darker front tint for documented medical conditions โ photosensitivity, lupus and similar light-sensitive diagnoses. The exemption requires a signed certificate from a licensed physician, surgeon, optometrist or dermatologist, the film is expected to be clear and colorless rather than dark-shaded, and the documentation has to stay in the vehicle so it can be produced at a stop. The permitted darkness is the minimum necessary for the condition, not an open license for limo tint.
Key takeaways
- Front side windows:ย 70% VLT minimum, measured glass + film together.
- Rear side windows and back glass:ย any darkness, dual side mirrors required.
- Windshield: non-reflective strip on theย top 4 inchesย only.
- No red, amber, blue or mirrored film.
- Fines usually runย $25โ$197ย on a first fix-it ticket.
- Medical exemptions exist but require a signed certificate kept in the car.
Frequently asked questions
What is the darkest legal tint in California?
On front side windows, 70% VLT โ anything darker is a violation. On rear side windows and the back window there is no darkness limit, so 5% limo tint is legal on a passenger vehicle.Is 35% tint legal in California?
Not on the front side windows. 35% VLT is well below the 70% minimum. It is perfectly legal on rear side windows and the back glass.Is 70% tint legal on the front windows?
Only if the combined reading of glass plus film stays at 70% or above. A film rated 70% installed over factory glass at 76% lands around 53% combined, which fails. This is why the code asks for aftermarket film that transmits more than 88% on its own.Do SUVs and trucks get darker legal tint in California?
No. Unlike many states, California applies identical limits to sedans, SUVs, vans and trucks.Can I tint my whole windshield?
You can apply a non-reflective strip to the top 4 inches. Clear film at 70% VLT or higher across the rest is generally accepted, but shaded windshield film below the strip is not.How do police measure tint?
With a handheld photometric tint meter clamped over the glass. The reading is objective and is used as evidence, so arguing about how dark it “looks” does not help.Is out-of-state tint legal while driving in California?
If you are registered in California, California rules apply regardless of where the film was installed. Visitors with out-of-state plates are generally treated more leniently, but enforcement is at the officer’s discretion.
This article explains California Vehicle Code ยง26708 in plain language for general information. It is not legal advice, and enforcement can vary by agency. Verify current requirements with the California DMV or CHP before installing film.