Montana uses a 24% front-side minimum and a 14% ordinary rear-glass minimum. Certain multipurpose vehicles, vans, and buses have a different rear-glass rule.
Read the official sources ↓Rules by window
| Window | Requirement |
|---|---|
| Windshield | Below the AS-1 line, sunscreening material must be clear and transparent. Red, yellow, or amber material above that line is prohibited. |
| Front side | At least 24% transmission; no more than 35% reflectance. |
| Rear side | Ordinarily at least 14% transmission and no more than 35% reflectance. The rear-window provision excepts multipurpose vehicles, vans, and buses. |
| Rear window | Ordinarily at least 14% transmission and no more than 35% reflectance, with the same class exception. |
Check the class and the existing tint
Montana defines a multipurpose vehicle as carrying no more than 10 passengers and built on a truck chassis or with special features for occasional off-road use. The rule expressly covers tinted windows with added sunscreening material. Manufacturer-tinted multipurpose vehicles and certain special-use vehicles have additional exceptions.
Medical waivers are issued, not assumed
The highway patrol or a local law-enforcement agency may grant a waiver for safety, security, or medical reasons. Medical support requires an affidavit from a licensed physician, physician assistant, or advanced practice registered nurse. Section 61-9-405 refers to a currently valid waiver certificate affixed to the vehicle.
Before you rely on this guide
This is general information, not legal advice, a vehicle inspection, or permission to install a particular film. Exceptions and enforcement procedures can depend on your circumstances.
- The statutory vehicle definition controls; the rear-glass exception should not be assigned automatically to every vehicle marketed as an SUV.
The research date shows when the sources were checked. It is not the date the law took effect, and it does not mean this page is monitored continuously. This research preview still awaits human editorial review; we do not claim attorney review.
Official sources
- Montana Code Annotated 2025, 61-9-405 ↗
Official 2025 code: limits, colors, manufacturer glazing, vehicle definitions, and waiver-certificate provision.
- Montana Code Annotated 2025, 61-9-428 ↗
Official waiver authority and medical affidavit requirements.