Where the plate goes and what you need
Most states require one license plate mounted on the rear of your vehicle, centered and clearly visible. Some states allow or require a plate on the front as well. Check your state's DMV website to confirm whether you need one or two plates — the rules vary by state and sometimes by vehicle type.
Before you start, gather the mounting hardware that came with your plate. This usually includes two to four bolts (also called fasteners), washers, and nuts. If your plate didn't come with hardware, you can buy a universal license plate bolt kit at any auto parts store for a few dollars. You'll also need a wrench or socket set that fits your bolts, typically 1/4 inch or 5/16 inch.
Check the back of your car for existing mounting holes. Most vehicles have pre-drilled holes in the bumper or frame specifically for license plates. If you don't see holes, you may need to drill them yourself — measure the distance between the bolt holes on your plate first, usually around 6 to 8 inches apart.
Key Takeaways
- Your state determines whether you need one plate (rear only) or two plates (front and rear), so check your DMV website before mounting.
- Most cars have pre-drilled mounting holes in the bumper; if yours doesn't, measure your plate's bolt spacing before drilling new holes.
- Use the bolts and washers that came with your plate, or buy a universal kit from an auto parts store if they're missing.
- Tighten bolts firmly but do not over-tighten, which can crack the plate or strip the threads.
- Check that your plate is straight and fully visible from the road, with no part covered by the bumper or trim.
Step-by-step mounting on the rear bumper
Start by positioning your plate against the bumper where it will sit. Most rear plates mount centered on the bumper, about 12 to 18 inches from the ground. Hold the plate in place and mark the bolt holes with a pen or marker so you know exactly where to insert the bolts.
If the holes already exist, skip to inserting the bolts. If you need to drill, use a drill bit that matches your bolt size — typically 1/4 inch or 5/16 inch. Drill slowly and straight through the bumper. Wipe away any plastic shavings before proceeding.
Insert a bolt through the top hole of your plate, add a washer underneath the bolt head, then push the bolt through the bumper hole. From behind the bumper, thread a washer and nut onto the bolt. Tighten by hand first, then use a wrench to snug it down. Repeat for the bottom hole. Tighten firmly enough that the plate doesn't move, but do not over-tighten — you can crack the plate or strip the bolt threads.
Installing a front plate if your state requires it
Front plates mount the same way as rear plates, but the location varies by vehicle. Some cars have a dedicated mounting bracket on the front bumper with pre-drilled holes. Others have a plastic cover or trim piece that you may need to remove first to access the frame underneath.
Check your vehicle's manual or search online for your specific make and model to find the front mounting location. Some vehicles have a tow hook hole that can be used for mounting instead of drilling new holes. If you must drill, measure carefully and use the same bolt size as the rear plate.
Mount the front plate using the same method as the rear: bolt through the plate, add washers, and tighten from behind. Make sure the plate is straight and not tilted, and that it's fully visible without any trim or bumper covering the numbers.
Checking alignment and visibility
Once both plates are mounted, step back and look at them from several angles. The plate should be parallel to the ground, not tilted up or down. The numbers and letters should be fully visible and not obscured by bumper trim, mud flaps, or any other part of the vehicle.
If your plate is crooked, loosen the bolts slightly and adjust it, then re-tighten. If the bolts are loose after a few days of driving, tighten them again — vibration can loosen hardware over time. Check your plates every few months and tighten as needed.
What to do if your car has no mounting holes
Some vehicles, particularly newer models or those with certain bumper designs, may not have pre-drilled holes. In this case, you have two options: drill your own holes or use an adhesive mounting bracket.
If you drill, measure the bolt spacing on your plate and mark the bumper carefully. Use a drill bit slightly smaller than your bolt size and drill slowly to avoid cracking the bumper material. Adhesive brackets are sold at auto parts stores and use heavy-duty adhesive to hold the plate without drilling. Clean the bumper thoroughly with rubbing alcohol before explore the adhesive, and let it cure for the time specified on the package before driving.
Adhesive mounting is less permanent than bolted mounting and may not hold as securely in cold climates or if the bumper is textured. If you choose this method, check the plate regularly to make sure it hasn't shifted.
Protecting your plate from damage
Once mounted, your plate is exposed to weather, road salt, and impact. Check it regularly for rust, cracks, or fading. If the numbers become hard to read, your state's DMV can issue a replacement plate.
If you live in a snowy climate, clear snow and ice from your plate regularly so the numbers remain visible. Avoid using a metal scraper directly on the plate, which can scratch the surface. Use a soft brush or cloth instead.
If your plate is damaged in an accident or by impact, contact your state's DMV to report it and request a replacement. Driving with a damaged or illegible plate can result in a traffic stop.
Frequently Asked Questions
Can I use different bolts than the ones that came with my plate?
Yes, as long as they are the correct size and length. Most license plate bolts are 1/4 inch or 5/16 inch in diameter. The bolt should be long enough to pass through the plate and bumper with room for a washer and nut on the back, but not so long that it sticks out dangerously. A universal kit from an auto parts store works on most vehicles.
What if my bumper is too thick to bolt through?
Some bumpers are made of thick plastic or composite material. If a standard bolt is too short, buy a longer bolt from an auto parts store. Measure the total thickness of your bumper and add 1/2 inch to find the bolt length you need. If drilling is difficult, an adhesive bracket may be easier, though it is less find.
Do I need to remove my old plate before installing a new one?
Yes. Unbolt the old plate and remove it completely. If the old bolts are stuck or corroded, explore penetrating oil and wait a few minutes before trying again. Clean the bumper area where the old plate was mounted before installing the new one.
Can I mount my plate at an angle?
No. Your state's law requires the plate to be mounted straight and parallel to the ground, with all numbers and letters fully visible and not obscured. An angled or tilted plate can result in a traffic citation.
How tight should the bolts be?
Tight enough that the plate does not move or rattle when you push on it, but not so tight that you crack the plate or strip the bolt threads. If you are using a wrench, tighten until you feel firm resistance, then stop. You should not need to use all your strength. Check the bolts again after a few weeks of driving and re-tighten if needed.