The short answer is yes – a 5 percent window tint is legal on the front side windows of passenger vehicles in Montana, but the law imposes stricter limits on rear windows, windshield, and the use of reflective films. As of the 2026 regulatory update, Montana still follows the 61‑4‑303 statute, which mandates a minimum visible light transmission (VLT) of 50 percent for the front driver and passenger windows, while the rear windows and back windshield may be tinted down to 5 percent VLT. The 2026 revisions clarified permissible reflective percentages and reinforced enforcement penalties, ensuring consistent compliance across the state.
Current Legal Requirements
Montana’s window‑tint rules are codified in the Montana Code Annotated, § 61‑4‑303. The key points are:
- Front driver and passenger windows must allow at least 50 percent of visible light to pass through. A 5 percent tint on these panes would violate the law.
- Rear side windows and the rear windshield may be tinted as low as 5 percent VLT, provided the film’s reflectivity does not exceed 20 percent.
- Windshield tint is limited to a maximum of 3 percent VLT and must be non‑reflective.
- Any tint that impairs the driver’s ability to see traffic signals, signs, or pedestrians is prohibited.
The 2026 rule amendment introduced a uniform reflectivity ceiling of 20 percent for all tinted surfaces and increased the fine for violations from $100 to $250, with additional points added to the driver’s record.
2026 Enforcement Changes
The 2026 updates focus on consistency and safety:
- Law enforcement officers now use calibrated light‑meter devices that record VLT readings directly to the police report, reducing disputes over tint levels.
- Commercial vehicle fleets are required to submit annual compliance certificates to the Montana Department of Transportation.
- Violations detected during routine traffic stops or vehicle inspections result in an immediate on‑the‑spot fine and a mandatory tint‑removal order for non‑compliant vehicles.
These changes aim to protect road safety while allowing owners the flexibility to use darker tints on rear windows where visibility to the driver is less critical.
Can I install a 5 percent tint on my front windows?
No. The front side windows must meet a minimum VLT of 50 percent, so a 5 percent tint would be illegal and subject to fines.
Is a 5 percent tint allowed on the rear windshield?
Yes, a 5 percent tint is permissible on the rear windshield, provided the film’s reflectivity does not exceed 20 percent.
What are the penalties for illegal tint?
The 2026 statute sets a base fine of $250, adds two points to the driver’s record, and may require the tint to be removed at the owner’s expense.
Are there special rules for commercial vehicles?
Commercial fleets must file an annual compliance certificate with the state DOT and are subject to spot checks. Non‑compliance results in the same fines plus possible suspension of the fleet’s operating license.
How can I verify my tint’s VLT rating?
Use a calibrated visible‑light transmission meter, which many auto glass shops possess, or have the tint professionally inspected during a vehicle registration renewal. The meter reading must meet or exceed the statutory minimum for the specific window.