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Utah's oddly specific 43% front rule trips up out-of-state installs all the time — 35% film fails here. Behind the driver there's no limit, and high-altitude UV makes ceramic worth it year-round, ski season included.
Reviewed July 2026 · Passenger cars (sedans)
| Glass | Rule for passenger cars |
|---|---|
| Windshield | Non-reflective tint above the AS-1 line. |
| Front side windows | 43% VLT or lighter |
| Back side windows | Any darkness |
| Rear window | Any darkness |
| Medical exemption | Conditional — verify with the DMV |
VLT — Visible Light Transmission — is the percentage of outside light that makes it through your glass. The number printed in the law is a floor: film may be that bright or brighter. Because factory glass already blocks a little light, an officer's meter reads the combined darkness of glass plus film. A film sold as "43%" on top of factory glass can meter a few points darker — which is why professional installers measure the final result, not the box label.
Quality matters as much as darkness. Dyed films fade purple and bubble; ceramic films like ULTRASHIELD SHADOW reject heat and up to 99% of UV at any legal darkness, with no signal interference — so you get the comfort without gambling on the number.
Certified shops that install to your state's exact legal limit and register your warranty with CARFAX.
This page summarizes Utah statute as published and was last reviewed July 2026. It is not legal advice. Laws change and local enforcement varies — confirm current rules with the Utah DMV before tinting.
Local answers for Utah drivers
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