Is window tint legal in Montana? Yes—Montana permits certain levels of tint on vehicle windows, but the law is strict about how dark the film can be and where it may be applied. As of 2024, passenger‑side windows may be tinted up to 35 percent VLT (visible light transmission), while the front windshield can only have a non‑reflective tint strip of up to 3 inches at the top. The back window may be any darkness, provided the vehicle has side‑mirror compliance. The state is poised to adopt new 2026 regulations that tighten VLT limits on the driver’s side and introduce mandatory certification for aftermarket films. (See Montana Motor Vehicle Code § 61‑13‑306.)
Current Montana Window Tint Laws
Montana’s existing statutes mirror a balance between safety and privacy. The driver’s side front window must allow at least 35 % of light, matching the passenger side. The windshield may only feature a strip of non‑reflective tint that does not exceed three inches in height. Rear windows can be fully darkened, but a pair of side mirrors must be present to ensure rear‑view visibility. Violations are treated as traffic infractions, resulting in fines ranging from $100 to $250 and a requirement to remove non‑compliant tint. (Montana Dept. of Justice, 2023)
Anticipated Changes for 2026
Legislators introduced Senate Bill 742 in late 2025, aiming to reduce glare and improve law‑enforcement identification. If enacted, the driver’s side front window VLT limit will drop to 30 %, and the passenger side will align at 30 % as well. Additionally, a new certification program will obligate tint installers to register with the Montana Department of Transportation and affix a permanent label stating the film’s VLT rating. The bill also proposes a $150 penalty for unregistered installers, reflecting a broader push for consumer protection. (Montana Legislative Services, 2025)
How to Stay Compliant
- Check the VLT Rating – Purchase tint with a certified VLT label; reputable manufacturers provide a testing certificate.
- Use a Trusted Installer – Verify the installer’s registration number once the 2026 certification requirement takes effect.
- Maintain Side Mirrors – Even with darker rear windows, two side mirrors are mandatory.
- Retain Documentation – Keep the tint receipt and VLT certificate in the vehicle; officers may request proof during a traffic stop.
- Monitor Legislative Updates – Montana’s statutes can change; subscribing to the DMV’s email alerts ensures you receive timely notices.
Frequently Asked Questions
Can I tint my windshield beyond the three‑inch strip?
No. Montana law restricts tint on the windshield to a non‑reflective strip no larger than three inches at the top. Any additional tint is considered illegal and will result in a fine.
Are there penalties for non‑registered tint installers after 2026?
Yes. The proposed 2026 regulations impose a $150 civil penalty on any installer who applies tint without proper registration, in addition to possible vehicle citations for the owner.
Does a darker rear window affect my insurance?
Most insurers do not penalize owners for darker rear windows as long as the vehicle meets the mirror requirement. However, some policies may require proof of compliance, so retain your certification documents.
Can I use reflective or mirror tint on the front side windows?
Reflective or mirror‑type films are prohibited on the front side windows because they can impair the driver’s vision and hinder law‑enforcement identification.
How do I verify the VLT rating of an installed tint?
The installer must provide a label indicating the film’s VLT percentage, and a copy of the manufacturer’s certification should be included with the receipt. A handheld VLT meter can also confirm compliance if you doubt the label’s accuracy.