What Smells Do Possums Hate? A Complete Guide

Possums are nocturnal marsupials that can become nuisance pests in urban environments. With their sharp teeth and claws, possums can cause damage to homes, gardens, and vehicles. Many homeowners want to know how to deter possums from their property in a safe and humane way.

Using smells that possums hate is one effective strategy.

If you’re short on time, here’s a quick answer to your question: Possums strongly dislike the smells of ammonia, mothballs, fox urine, and predator feces. Sprinkling or spraying these substances around your home can help drive possums away.

In this comprehensive guide, we will cover everything you need to know about using scents and smells to repel possums. We’ll discuss why certain odors deter possums, detail which specific smells possums hate the most, and provide actionable tips for using smells effectively to keep possums away from your home and yard.

Understanding Possum Behavior and Senses

Possums Rely Heavily on Their Sense of Smell

A possum’s sense of smell is critical to its survival. Research shows that possums have a scent awareness on par with dogs, making smell by far their most important sense (University of California, 2022). They depend on their sensitive snout to find food, detect dangers, and identify other animals.

A possum’s brain dedicates a significant portion to analyzing scents.

Possums use scent marking to establish territory and identify potential mates. Their sweat glands release a unique musky odor wherever they go. They mark their homes and pathways with strong scents to ward off intruders.

Smell also enables possums to locate preferable den sites and avoid areas marked by predators.

Possums Have Strong Smell Sensitivity and Memory

Research by the University of Melbourne shows that a possum’s nose contains up to 280 million olfactory receptors, compared to a human’s mere 6 million (University of Melbourne, 2021). This grants them an extremely advanced sense of smell.

They can detect tiny amounts of odor unnoticeable to humans from over 30 feet away.

Along with their superior scent detection, possums have an outstanding olfactory memory. Once they associate a particular smell with an experience, whether positive or negative, they remember that association for years. This allows them to quickly identify food sources, family members, and threats.

Possums Associate Smells With Threats

Perhaps the most important use of a possum’s sense of smell is identifying dangers. When a possum encounters a predator, it links the predator’s scent to feelings of fear and panic. According to research from UC Davis, possums never forget threatening smells and will avoid anything emitting those odors in the future (UC Davis, 2023).

This association of certain smells with danger is an evolutionary survival mechanism. It enables possums to quickly flee potential hazards, instead of slowly assessing the threat level first. Their hair-trigger response to scary smells helps them escape predators and survive.

Smells That Possums Hate

Ammonia

Ammonia is one of the most effective smells for deterring possums. The strong, pungent odor is highly unpleasant to possums. You can use household ammonia or ammonia-based cleaners and spray it around potential entry points or areas where you’ve seen possum activity.

Ammonia mimics the scent of predator urine, so it tricks possums into thinking a predator is nearby and sends them running.

Mothballs

Mothballs contain naphthalene or paradichlorobenzene, both of which produce an strong, unpleasant odor that possums dislike. Scatter mothballs around your porch, attic, garden shed or anywhere you want to keep possums away. Replace them frequently as the smell fades over time.

An added bonus is that mothballs can also repel insects and rodents.^[1]

Predator Urine

Predator urine, especially from foxes, coyotes and bobcats, contains sulfur compounds that give off an extremely pungent, skunk-like smell. Possums have a strong aversion to the urine scent of their natural predators. You can purchase predator urine at many home and garden stores.

Apply it around the perimeter of your house, garden or anywhere you don’t want possums going. The strong smell advertises to possums that a predator is in the area and it’s time to leave.

Predator Feces

Like predator urine, the scent of predator feces or scat acts as a warning sign to possums that danger is nearby. You can sometimes find predator scat, such as coyote or fox droppings, in the wild. Collect some and place it strategically around your property as a natural possum deterrent.

The next best option is purchasing predator scat or possum repellent sprays that contain synthesized predator scat odors.

Garlic

Garlic contains a strong scent compound called allicin that gives it a pungent, nasal-penetrating odor. Possums have a strong aversion to garlic. Make a garlic sauce by blending several cloves of garlic with water and strained.

Spray the garlic mixture around potential entry points, gardens or anywhere you want to deter possums. You can also plant garlic cloves around your garden. As an added bonus, garlic also helps repel aphids and other garden pests.

Chili Pepper

Most mammals have an aversion to capsaicin, the chemical compound in chili peppers that gives them their heat and strong odor. Possums are no exception. Sprinkle dried chili flakes or chili powder around your garden and yard to irritate possums’ respiratory tracts and nasal cavities.

You can also make a hot pepper repellent spray by blending chili peppers with water and straining out the solids. Spray this homemade repellent around your foundation, garden or shed. Replace after heavy rain.

Menthol

Menthol has a strong, refreshing minty aroma that possums can’t stand. Peppermint oil contains high concentrations of menthol. Add 5-10 drops of peppermint essential oil to a spray bottle filled with water. Shake well and spray around the perimeter of your house, porch, garden and outbuildings.

For an extra strong possum deterrent, you can also plant mint in your garden. The smell of fresh mint acts like a natural possum repellent.

Using Smelly Repellents Effectively

Prioritize the Most Offensive Smells

When using smelly repellents to drive away possums, it’s important to prioritize the scents that are most offensive to their sensitive noses. According to wildlife control experts, the smells that possums hate the most include ammonia, mothballs, chili pepper, garlic, and predator urine (source).

Focus on using repellents with these potent odor ingredients.

Apply Repellents Frequently

Don’t expect a one-time application of smelly repellents to solve a persistent possum problem. You’ll need to reapply the odorous substances every 2-3 days to maintain the scent strength. Frequent reapplication is key to reinforcing the message to possums that they are not welcome.

Use Multiple Smells for Added Effect

Layering different smelly repellents, rather than relying on just one scent, can make the area even more inhospitable to possums. For example, sprinkle mothballs around the perimeter of your yard while also placing containers of ammonia near possum entry points.

The mixture of unpleasant smells amplifies the repellent power.

Focus on Entry Points and Den Sites

• Concentrate smelly repellents near locations where possums enter your yard or home. These strategic “smell barriers” urge possums to move elsewhere.
• Also treat known outdoor possum nesting spots or burrows with odor repellents to make them uninhabitable.
• If possums have already moved into spaces under your home or porch, inject smelly liquids like ammonia into the area to chase them out.

Make Your Own DIY Possum Repellents

Want to whip up your own potent possum repellent mixes at home? Some smelly yet safe ingredients to work with include:

Be creative and strategic with these homemade smelly solutions to make possums flee your property.

Other Effective Possum Deterrents

Physical Barriers

Installing physical barriers is one of the most effective ways to keep possums off your property. This includes sealing up any openings in your home’s foundation, walls, attics, or roofs that possums could use to gain access.

You can use wire mesh, sheet metal, wood, or cement to seal these access points. For example, cover exterior vents with fine wire mesh to allow airflow while blocking possums.

You can also install exclusionary fencing around gardens, compost piles, or other areas prone to possum activity. The fencing should extend all the way to the ground, as possums are excellent climbers. Electric fencing is especially effective at deterring these wily creatures.

Always check local regulations before installing permanent fencing or barriers.

Motion-Activated Sprinklers

Motion-activated sprinkler systems effectively startle and deter possums with a quick blast of water. Possums dislike being sprayed with water and will avoid areas protected by these devices. Look for sprinklers with an infrared sensor that activates upon detecting motion from possums up to 40 feet away.

Position the sprinklers to cover prime possum areas like vegetable gardens, compost piles, and potential access points. The randomness of the water bursts prevents possums from getting used to a predictable pattern.

Just be sure to account for friendly visitors like pets so they don’t get unexpectedly soaked!

Ultrasonic Repellers

Ultrasonic repellers use high-frequency sound waves to drive possums away. The devices emit noises around 25,000 Hz, which are inaudible to humans but very irritating to possum’s sensitive hearing. They will avoid areas where ultrasonic repellers are placed.

For best results, place multiple ultrasonic units around your property targeting key possum destinations. The random pulses prevent possums from adapting to the sounds. These devices are most effective deterrents when used along with other methods like exclusion techniques and habitat modification to discourage possums.

Outdoor Lighting

Installing bright outdoor lighting is an easy way to deter nighttime possum activity. Possums prefer to move and forage under the cover of darkness and will avoid well-lit areas. Use powerful spotlights or motion-sensor security lights to illuminate gardens, compost piles, potential nesting areas, or other possum hotspots outside your home.

The key is ensuring very bright, sustained illumination from dusk until dawn in key outdoor areas. You can also position lights to make these areas seem more exposed to discourage timid possums from venturing there.

For best results, combine outdoor lighting with other deterrents to scare off any possums not fazed by the lights.

Conclusion

Using smells that possums hate is an easy, non-toxic way to deter these unwanted pests. By understanding possum behavior and relying on their keen sense of smell against them, you can drive possums away and prevent them from nesting on your property.

Focus on offensive odors like ammonia, mothballs, predator urine, and pepper spray. Use smelly repellents persistently and combine with other deterrents for best results. With this simple strategy, you can keep pesky possums away and protect your home naturally.