15% VLT Tint on Front in Montana
Installing a 15% VLT film on your front side windows is prohibited (only films in the 35% - 100% VLT range are compliant) under Montana Code Annotated Section 61-9-405.
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Calculate compliance for all windows in Montana.
MT Technical VLT Blueprint
Interactive diagnostic spec sheet
VLT Compliance Analysis
Visible Light Transmission (VLT) measures the amount of light passing through the glass. In Montana, front side window glass must transmit a minimum of 35% light.
Installing a 15% VLT film on front side windows is illegal in Montana. You risk a citation fine of $85 traffic ticket fine. To stay legal, use a film rated 35% VLT or lighter.
Modifier Workarounds & Legal Options
Medical Waiver
Montana allows drivers with qualifying medical conditions to obtain an exemption for darker tint.
Net VLT Math
Factory glass is pre-tinted (typically 75% VLT). Adding a 15% film results in a net VLT of 11%, pushing you further under the limit.
Ceramic Film
High-quality clear ceramic films at the legal 35% VLT can block up to 99% UV and 80%+ infrared heat without darkening windows.
15% Tint Compliance Metrics Check
Passenger Sedans
| Windshield: | Non-reflective tint allowed above AS-1 line or top 5 inches |
| Front Side: | (Limit: 35%)✗ ILLEGAL |
| Rear Side: | (Limit: 20%)✗ ILLEGAL |
| Rear Window: | (Limit: 20%)✗ ILLEGAL |
SUVs, Trucks & Vans
| Windshield: | Non-reflective tint allowed above AS-1 line or top 5 inches |
| Front Side: | (Limit: 35%)✗ ILLEGAL |
| Rear Side: | (Any)✓ LEGAL |
| Rear Window: | (Any)✓ LEGAL |
Penalty Enforcement Schedule
If local enforcement pulls you over and tests your glass using an electronic light transmission meter, results below 35% VLT trigger local penalties.
| Infraction Class | Fine Schedule |
|---|---|
| First Offense | $85 traffic ticket fine |
| Physical Compliance Check | Mandatory Verification |
Full State Database
Window tint codes regulate windshields, rear sides, and rear windshields under distinct parameters.
See All Montana Rules