Legal Tint Limits in Montana Today
Montana permits a maximum of 35 percent visible light transmission (VLT) on front side windows, while rear side and back windows may be as dark as 5 percent VLT. The windshield must remain clear, with only a strip at the top allowed for non‑reflective tint. These rules have been in effect since the state adopted its current window‑tint statute in 1999. Drivers who exceed these limits risk fines, vehicle‑inspection failures, and possible suspension of registration.
How the 2026 Legislative Schedule Could Affect Tint Laws
In 2024 the Montana Legislature introduced Bill 2026‑17, proposing to raise the front‑side limit from 35 percent to 40 percent VLT. The bill passed the House but stalled in the Senate, and a deadline for enactment is set for the 2026 legislative session. If the measure becomes law, owners will be able to install slightly darker front‑side tint without penalty. Until the new statute is officially enacted, the existing 35‑percent rule remains enforceable.
Compliance Tips for Drivers
- Verify the VLT rating on the tint label before installation.
- Keep a copy of the tint certification in the vehicle’s glove compartment.
- If you purchase a used car, request an inspection report that includes VLT measurements.
- Use a handheld tint meter to double‑check compliance after installation.
- Remember that aftermarket tint applied without a professional seal may be deemed illegal even if the VLT rating is correct.
Penalties for Non‑Compliant Tint
Montana law classifies illegal tint as a traffic violation. First‑time offenders typically receive a $100 fine and a requirement to remove or replace the tint within 30 days. Repeat violations can lead to increased fines up to $250 and may affect vehicle registration renewal. Law‑enforcement officers can issue a citation on the spot after a visual inspection or a roadside tint‑meter reading.
Frequently Asked Questions
What is the exact VLT percentage allowed on front side windows?
The front side windows must allow at least 35 percent of visible light to pass through, meaning the tint cannot be darker than 35 percent VLT.
Can I tint the windshield at all?
Only a non‑reflective strip along the top of the windshield may be tinted, usually limited to a height of no more than 4 inches. The rest of the windshield must remain clear.
Does Montana differentiate between factory‑installed and aftermarket tint?
No. Both factory and aftermarket tint must meet the same VLT requirements. If the factory tint exceeds legal limits, the vehicle can still be cited.
How can I prove my tint is legal if stopped by police?
Carry the tint certification label and a recent VLT measurement report. A handheld tint meter reading that shows compliance can also be presented.
Will the proposed 2026 law automatically repeal current penalties?
If the bill passes, the new VLT limits will replace the old ones, but penalties for violations occurring before the effective date will still be enforced under the prior statute.