# How dark can window tint be in California?

In California the front side windows must let at least 70% of outside light through (with factory glass, that leaves room for only a light film), and the windshield may only have tint on the top 4 inches. Rear side windows and the rear window can be any darkness as long as the car has outside mirrors on both sides. Reflective or mirrored tint is not allowed. Medical exemptions exist with a doctor's note. Confirm current rules with the California Highway Patrol before you tint.

## Key facts

- California Vehicle Code section 26708 sets the window tint rules.
- Front side windows: at least 70% visible light transmission.
- Windshield: tint only on the top 4 inches.
- Rear windows: any darkness with dual outside mirrors.

## Quick reference

| Window | Rule |
| --- | --- |
| Windshield | Top 4 inches only, non-reflective |
| Front side windows | At least 70% of light must pass through |
| Rear side windows | Any darkness |
| Rear window | Any darkness, if the car has both side mirrors |

Source: California Vehicle Code §26708 and the [California Highway Patrol](https://www.chp.ca.gov/). This is a summary, not legal advice.

## Next step

[Window tint shops in Los Angeles](https://appointauto.com/ca/los-angeles/tint-and-wraps/) · [Tint and wrap shops in every California city](https://appointauto.com/ca/)

Official sources: [chp.ca.gov](https://www.chp.ca.gov/).

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Source: https://appointauto.com/answers/california-window-tint-law/ · Last updated 2026-10-26. Station details are compiled from public listings and can change; call the shop to confirm hours and prices before you go.