How To Keep Mice Out Of a Camper (Science-Backed Methods)

Are you looking for an effective way to keep mice out of your camper?

You’re not alone, as mice finding refuge in campers and RVs is an extremely common occurrence.

Unfortunately, there are more myths than facts when it comes to repelling mice.

In this article, we’ll show you exactly how to keep mice out of your camper and deal with an existing mice infestation.

Why Mice Love Your Camper

holding a mouse next to camper

Believe it or not, your camper, especially when stored for the season, provides the perfect environment for mice.

  • Mice prefer dark and confined places where they can eat and reproduce without being disturbed.
  • Campers also provide valuable protection from harsh weather conditions and temperature drops. This is why it’s more common for mice to invade your camper in winter (and another reason you should learn how to winterize your camper properly).
  • Parking your camper near a food source, like a trash bin at a campsite, or leaving crumbs and open food containers in your vehicle, increases the chance that mice will make it their home.

As you can see, your camper provides the ideal living space for rodents. Now, couple that with easy entry into most RVs, and you can see why mice infestations are such a common occurrence.

Where Do Mice Enter a Camper?

mouse fitting through a pen hole

Mice have flexible skeletons allowing them to fit through the tiniest holes in your camper.

Did you know…
A mouse can squeeze through a hole the diameter of a normal-sized pen!

Even if they don’t initially fit through the opening, they will chew on the sides to make it big enough for their small bodies.

So, it’s important to first identify the spots where rodents will likely enter your camper.

  • Cracks around doors are arguably the most common way for mice to enter your camper. They can squeeze through even the smallest cracks.
  • Pipes that haven’t been properly sealed will also be tempting for mice to explore. Metal pipes might not be properly aligned, so there will be enough space for mice to squeeze their bodies.
  • Engine openings should be properly sealed after you’ve maintained your camper. At the end of the season, you’ve probably had your RV checked so it can be safely stored. Ensure that all rubber caps have been added to their original places to prevent the entry of these rodents.
  • Your floor might be rusty, so there may be a few fragile spots or holes on the floor where the mice can go through.
  • Corners are weak spots that represent easy entry spots. They tend to deteriorate quickly and become more fragile with exposure to the elements.
  • Windows that are left open are inviting for mice and rats. Leaving a small crack because you didn’t close the window properly is a common entry point for these rodents.
  • Leaving food in your camper is another reason mice will be eager to make it their new home. Mice have a strong sense of smell and are always looking for food. Combine that with warm and quiet shelter, and you are basically asking mice to come in.

Now, let’s find out how to find these entry points in your camper.

Finding Entry Points on Your Camper

The best thing you can do to fight a serious mice infestation is to prevent it in the first place. Identifying entry points on your camper or travel trailer is the first thing you can do to control an infestation.

We briefly discussed some possible entry points above, but now let’s look at how to find these spots in your camper.

Tip: Print this page (or view it on your mobile device) and check off each step as you go.

  • Use a flashlight and crawl under the RV to examine the bottom. Even the smallest holes will be big enough for a small mouse.
  • Take your camper out in the sun and examine it carefully. If you see the sunlight shining through the walls and closed doors, then there are probably cracks that need to be carefully sealed. You can also use a flashlight at night with someone else outside the camper to check for cracks that need to be sealed.
  • Examine all the corners of your camper as they are often weak spots that might let mice through.
  • Check out the wiring and plumbing on the RV. There might be some gaps around the pipes that allow mice to crawl into your camper.
  • Take a look at all the rubber seals. Rubber gets dry with time, making it easy for mice to break and chew. Doing regular maintenance by replacing the old seals will help secure your camper.
  • Examine all the vents and other access panels in your camper. These might not be properly sealed on the outside, allowing mice to easily enter your camper.
  • If your camper has a storage area, examine it properly. Many people forget about the storage area and leave it unattended, so mice will find it extremely comfortable and cozy. Check all the entry points and see if there are any holes that need to be fixed.
  • After a camping trip, clear all unnecessary items from the camper. Mice love clutter so you should make sure that there are no hidden areas where they can build their nests.
  • Don’t keep any food items in the camper if you’re not planning to go on a trip soon.
  • Regular cleaning of your camper is essential whether you’re a full or part-timer. Thoroughly clean the RV of any spills or crumbs that might tempt mice to enter your camper.
  • Use a cleaning detergent to clean all the flat surfaces in your kitchen and underneath furniture (sofas, beds, chairs, etc.).
  • Don’t store your camper in a woody or grassy area if possible.
  • Keep your camper away from water sources, dumpsters, and bird feeders, as they tend to attract rodents.
  • Don’t store any pet food in the garage if you’re parking your camper there.
  • Mice won’t just eat food remains. They will shred up papers, clothes, and towels and use them to build their nests.
  • Vacuum your camper regularly.

How to Mouse Proof A Camper

After identifying the potential risky spots, you should seal them. This will cut off access to your camper, effectively mouse-proofing it so you can concentrate on any rodents already inside.

Remember that mice are social creatures, so having even one inside your camper means that others may soon join them (if they haven’t already). Here’s what you can do to seal your camper and mouseproof it.

  • Use expandable foam to secure and close all the cracks. This foam dries to fill in the gaps that let mice through.
  • A steel wool and caulk mixture is a popular option to seal cracks and prevent mice. The caulk seals the hole while the sharp metal fibers of the steel wool ensure they can’t chew through it.
  • Replace all damaged seals to ensure that mice and rats can’t chew on the dry and cracked rubber.
  • Seal any gaps around piping and wiring that have entry points from the outside.
  • Use wire mesh screens on the vents and windows to ensure there are no openings where mice can get through.
  • Check out the old vents. Have all the old ones replaced and ensure the new ones fit properly to minimize access.
  • Use nighttime lighting because mice and rodents hate light. Add some lights that automatically turn on to disturb mice so they don’t feel comfortable in your camper.

How To Get Rid Of Mice In Camper

Now that you’ve sealed all the entry points, it’s time to turn to the mice already inside your camper. There are several ways that will help you get rid of mice, including:

Peppermint Oil

Peppermint oil is a natural mouse repellent. You can use cotton balls and soak them in peppermint oil to keep the mice away. Just place the cotton balls in areas where you found mice droppings. You can also pour some of the oil in corners and holes where you suspect the presence of mice. The good thing about peppermint oil is that it has a refreshing smell that lingers, so it will also fight off any bad smells caused by mice in your camper.

Peppermint Essential Oil (16 Ounce Bottle)

Peppermint Essential Oil (16 Ounce Bottle)

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Chili Oil

Chili oil is a popular ingredient that can cause discomfort if eaten or breathed in. Because of this, it’s thought that the strong smell of chili oil might be enough to keep mice away.

Researchers from Chulalongkorn University decided to test this idea by studying how mice reacted to natural smells like chili. They found that the strong smell of chili stopped the mice from returning to the bait.

Chili Oil

Chili Oil

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Live Traps

Live traps are an effective and humane way to trap a mouse while keeping it alive. You then just have to release the mouse, preferably far away from your camper. The downside is that you can only catch one mouse at a time, so you’ll want to set multiple traps if you believe you have an infestation.

Humane Live Mouse Trap

Humane Live Mouse Trap

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Why Can’t I Just Kill Mice?

Well, technically, you can… but mice are essential creatures that are a food source for several animals, including foxes, weasels, bobcats, hawks, owls, and bears. Getting rid of them means cutting this food supply from a host of different animals.

Mice are found in almost every ecosystem, and they link plants and animals together. Eliminating them from an ecosystem could cause an unnecessary imbalance.

This is why we prefer to find humane ways to remove and keep them away instead of killing them.

Humane Live Mouse Trap

Humane Live Mouse Trap

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Using poison to kill mice has a negative impact on the environment. These poisonous chemicals don’t degrade and will still be present in your camper long after you’ve gotten rid of all mice and rats. Plus, the mice may spread the poisons to other areas and animals.

Moreover, it’s quite annoying to get rid of a poisoned mouse as they often hide (and die) in holes that you can’t easily detect. You’ll then be dealing with a nasty smell that is hard to eliminate.

We also don’t recommend traps that kill mice and rats because you’re depriving other animals of their natural food source. Although you don’t want mice in your camper, they’re welcome to live in fields and gardens where they belong.


What Can I Put In My Camper to Keep Mice Out?

Peppermint oil and chili oil are two proven mice repellants that are backed by scientific studies. Combine them with properly sealing off your camper and removing any food sources, and you’ll effectively keep mice out.

Do Dryer Sheets Repel Mice in an RV?

Dryer sheets are not an effective mouse control solution, and contrary to what some campers believe, there’s no evidence that they prevent mice.

What Scent Will Keep Mice Away?

Certain scents like peppermint oil and chili oil can be somewhat effective in keeping mice away. But they won’t stop a determined mouse from entering your camper. Be sure to first seal off ALL entry points in your camper, then rely on scent-based repellents after that.

Will a Bar of Irish Spring Soap Keep Mice Away?

Irish Spring is another scent-based repellent that some claim to have had success with, but there’s no evidence other than personal anecdote that Irish Spring does anything. Even if it had a minimal effect as a repellant, we wouldn’t recommend it as the sole solution to your rodent problems.

Is Ammonia an Effective Mouse Repellent?

Ammonia is commonly cited as an effective way to repel mice. However, studies show that the presence of ammonia does not affect their behavior. Myth busted.

Do Mothballs Keep Mice Out of Campers?

Mothballs, essentially fabric clusters drenched in a chemical called Naphthalene, can potentially lead to serious health issues if inhaled excessively. Symptoms can range from nausea and dizziness to more severe conditions such as damage to the kidneys and liver. A study by the National Toxicology Program aimed to assess if these severe effects were also present in mice. The findings revealed that Naphthalene heightened the risk of tissue degradation in the nasal canal and triggered lung inflammation in mice. However, these adverse effects may not be sufficient to dissuade mice from the vicinity of the mothball.

Does Pine-Sol Keep Mice Away?

Like most other scent-based repellents, Pine-Sol may slightly deter rodents, but it’s not an effective solution for keeping mice out of your camper.

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