Montana Window Tint Laws Explained: Legal VLT Limits for 2026

Big-sky glare bouncing off the snow near Bozeman or the open road to Billings will wear a driver down, and the practical question is always how dark the law allows. Montana is generous: your front side windows can come down to 24% VLT, the rear glass can reach 14%, and the windshield stays clear below the AS-1 line. Here is the full rundown from the code.

How dark can you legally tint in Montana?

Front side windows down to 24% VLT, rear and back side windows down to 14%, with a clear windshield below the top line. Montana Code Annotated § 61-9-405 prohibits operating a vehicle if the front side windows allow less than 24% light or reflect more than 35%, and if the rear window or side windows behind the front seat allow less than 14% light or reflect more than 35% — except on a multipurpose vehicle, van, or bus, where the back-glass floor is lifted. The windshield must stay clear and transparent below the AS-1 line, with no red, yellow, or amber film above it. You can read the current 2025 text on the official Montana Code Annotated site.

The Montana tint claims worth double-checking

Myth: 24% is the limit for the whole car. Reality – only the front sides sit at 24%. The rear and rear-side glass can legally go all the way to 14% on a passenger car, which is noticeably darker, so quoting one number for every window misreads the law.

Myth: factory privacy glass and aftermarket film are treated the same. Reality – the statute specifically exempts a multipurpose vehicle equipped with tinted windows installed by the manufacturer. Factory privacy glass on an SUV is fine; adding film on top is where the rules re-engage.

Myth: Montana hands out a medical exemption like other states. Reality – Montana uses a certificate-of-waiver system through § 61-9-428 rather than a simple doctor’s-note carve-out. It is a formal department-issued waiver, not an affidavit you write yourself.

Reflectivity, color, and the windshield rule

Reflectance is capped at 35% on both the front sides and the rear, keeping mirror-finish film off the road even when it passes the darkness test. The windshield has to stay clear below the AS-1 line, and any film above it cannot be red, yellow, or amber. Sitting beneath the state rule is the federal baseline: the statute itself points to the National Highway Traffic Safety Administration’s glazing standard in FMVSS 205 (49 CFR 571.205) for campers, motor homes, and other glazing. A clean window tint install honors both.

Penalties and what you must keep

A tint violation in Montana is a misdemeanor under the Title 61 equipment provisions, and the waiver paperwork is what separates a legal dark build from a citation.

What to do: if your vehicle qualifies for a waiver — a hearse, ambulance, government vehicle, or one grandfathered from October 1, 1991 — keep that certificate of waiver affixed and current. Otherwise, hold the front sides at 24% and enjoy the darker 14% out back. If your SUV came with factory privacy glass, leave it as-is rather than layering film that pushes it out of compliance. The Montana Department of Justice, which oversees the Motor Vehicle Division, is the official reference.

See how Montana’s generous numbers compare to our Texas window tint laws and California window tint laws guides. When you are ready to build, browse our window tint options, view pricing, consider ceramic coating for the paint, and get started.