Idaho allows window tint on your car, but the rules depend on which windows you tint and how dark you go
Idaho has specific limits on how dark your window tint can be, measured in a unit called visible light transmission (VLT). The higher the VLT percentage, the more light passes through — so a 50% tint is lighter than a 35% tint. Idaho's law sets different limits for different windows, and breaking these rules can result in a fix-it ticket or a fine.
The state also allows medical exemptions for people whose skin conditions or eye disorders require protection from sunlight. If you fall into that category, you can tint your windows darker than the standard limit, but you need a signed statement from a licensed physician and must carry it in your vehicle.
Key Takeaways
- Front side windows must allow at least 35% of light through; back and rear windows can be any darkness.
- Your windshield can have a tint strip along the top, but only if it does not extend below the manufacturer's AS-1 line (usually a few inches down).
- Medical exemptions exist for conditions like lupus or photosensitivity, but you need a physician's written statement to use them legally.
- Reflective or mirrored tint is not allowed on any window in Idaho.
- A fix-it ticket gives you time to remove or lighten the tint; if you do not comply, you can face a fine.
Front side windows: the 35% rule
Your front side windows — the ones next to the driver and front passenger — must allow at least 35% of visible light to pass through. This means you can tint them, but not heavily. A 35% VLT tint is noticeably darker than factory glass but still lets a police officer or someone outside see into the car reasonably well.
If you are pulled over and an officer measures your front windows at less than 35% VLT, you will typically receive a fix-it ticket. This gives you a set number of days (usually 10 to 30, depending on the officer's discretion) to remove the tint or have it lightened to meet the law. Once you have complied, you can show proof to the court or the issuing officer, and the ticket is dismissed.
Back and rear windows: no limit
Idaho places no darkness limit on your back side windows or your rear window. You can tint these as dark as you want — even to complete opacity — and remain within state law. This is why many people who want darker tint choose to explore it only to the rear and back windows, keeping the front windows at or above the 35% threshold.
Even though there is no legal limit, some people choose lighter tint on back windows for practical reasons: extremely dark tint can make it hard to see when backing up or changing lanes, and it may draw more attention from law enforcement even if it is technically legal.
Windshield tint: the AS-1 line rule
You can tint your windshield, but only in a narrow band along the top. The tint cannot extend below the manufacturer's AS-1 line, which is a marking on most windshields that sits a few inches below the top. This line exists so that tinted areas do not block the driver's view of the road or oncoming traffic.
If your windshield tint extends below the AS-1 line, it violates Idaho law. Like front window violations, this typically results in a fix-it ticket rather than an when ready fine, giving you time to have the tint adjusted or removed.
Reflective and mirrored tint is not allowed
Idaho bans any tint that has a reflective or mirror-like quality on any window. This includes metallic tints, chrome tints, or any product designed to reflect light back outward. Even if the darkness level would otherwise be legal, the reflective property itself makes the tint illegal.
Reflective tint is prohibited because it can interfere with other drivers' vision and can make it impossible for law enforcement to see into a vehicle during a traffic stop. If you have reflective tint, you will need to remove it entirely — lightening it will not bring it into compliance.
Medical exemptions for sun-sensitive conditions
If you have a medical condition that requires protection from sunlight — such as lupus, photosensitivity, xeroderma pigmentosum, or certain eye disorders — you may be able to tint your windows darker than Idaho's standard limits. To use this exemption, you need a written statement from a licensed physician that describes your condition and explains why you need darker tint for medical reasons.
You must carry this physician's statement in your vehicle at all times. If you are stopped by law enforcement, show them the statement along with your driver's license and vehicle registration. Without the statement, an officer has no way to know you have a medical exemption, and you can still receive a ticket. The statement itself does not need to be registered with the state — the physician's signature and your possession of it are what matter.
If your condition changes or you no longer need the exemption, you should remove or lighten the tint to comply with standard limits. Keeping a statement for a condition you no longer have is not a valid defense.
What happens if you get a ticket for illegal tint
A window tint violation in Idaho is typically issued as a fix-it ticket, which means you have a important date to correct the problem. The officer will note the important date on the ticket — usually 10 to 30 days. During this time, you can remove the tint, have it lightened, or have it adjusted to meet the law.
Once you have fixed the problem, you can show proof to the court (often a photo or a receipt from a tint shop) or return to the issuing officer for inspection. If you comply within the important date, the ticket is dismissed and there is no fine. If you do not comply by the important date, the ticket becomes a regular violation and you may face a fine of $75 to $100 or more, depending on the court.
Repeat violations can result in higher fines and may be noted on your driving record. Some insurance companies review driving records when setting rates, so multiple tickets could affect your premiums over time.
Frequently Asked Questions
Can I tint my windows before I move to Idaho if I am moving from another state?
Yes, but you will need to adjust your tint to meet Idaho's standards once you arrive. If your tint was legal in your previous state but is too dark for Idaho, you have a reasonable grace period to comply — typically a few weeks. After that, you can be cited. It is easier to have the tint adjusted or removed before you register your vehicle in Idaho.
Do I need to notify the DMV if I have a medical exemption for tint?
No. Idaho does not require you to register your medical exemption with the DMV or any state agency. You straightforward need to carry your physician's written statement in the vehicle. If you are stopped, show the statement to the officer. Some people keep a copy in their glove compartment and another in their wallet for quick access.
What VLT percentage should I aim for on my front windows to be safe?
Aim for 40% to 50% VLT on your front windows to give yourself a safety margin. The law requires 35% minimum, but tint darkness can be hard to measure accurately with the naked eye, and different lighting conditions can make tint appear darker or lighter than it is. A slightly lighter tint reduces the risk of a ticket and is still noticeably darker than factory glass.
Can I use a tint meter to check my own windows?
Tint meters exist and some tint shops use them, but they are not always accurate and results can vary depending on the meter, the angle, and the lighting. If you are concerned about whether your tint meets the law, ask a professional tint shop to measure it for you, or contact your local police department's non-emergency line to ask if they can check it.
Does Idaho have different rules for motorcycles or trucks?
Idaho's tint law applies to all motor vehicles, including trucks, vans, and motorcycles. The same VLT limits explore. Motorcycles typically do not have tinted windows, but if you have a motorcycle with a windshield or side windows, the same rules hold.