Do Mothballs Deter Gophers? Safer Alternatives

If you are dealing with fresh mounds, clipped roots, and tunnels popping up overnight, you have probably searched for an easy fix. So, do moth balls deter gophers? The short answer is no reliable one, and using mothballs outdoors creates real safety and legal headaches.

For more help, see our Do Natural Gopher Repellents Work? Evidence-Based Options guide.

People reach for them because the smell is strong, and it feels like it should repel underground animals. In reality, gophers tunnel, reroute, and keep feeding, while mothballs mostly add risk to your yard instead of control.

Do mothballs actually work on gophers?

Mothballs are marketed for moth protection, not for pest control in soil tunnels. Odor might bother some animals briefly, but gophers are not moths, and they do not stay in one place long enough for smell-based deterrence to solve the problem.

Why the idea is so common

The idea spreads because mothballs contain chemicals that create a powerful odor, and gophers are also underground. When people see an animal avoid a spot after placing mothballs, they assume the smell caused it. There is also a general belief that “strong odor equals repellent,” so the logic seems straightforward.

In practice, gopher activity is driven by food, cover, and safe tunnel routes. When a gopher avoids one entrance, it can still move through the underground network and keep damaging plants. The “repel” effect usually does not last long enough to matter.

What gophers are likely to do instead of leaving

Gophers are built for moving underground. If they encounter a chemical odor near one entry point, they do not “give up” the yard. They tunnel around the area and use other routes to reach roots, bulbs, and grasses.

This also means you may see scattered changes that look like progress, but the damage continues. Fresh digging can appear farther away from where you placed mothballs, because the gopher is still living and feeding, just with a slightly altered path.

The limits of odor-based repellents in tunnels

Even if odor does reach tunnels, it disperses unevenly through soil. Tunnels create protected air spaces, and airflow in the ground is limited compared to open air. As moisture changes and the chemical breaks down, odor intensity drops quickly.

Gopher tunnels also connect, so blocking one scent source does not stop the network. Odor-based products do not target the animal, and they do not remove the feeding pressure that is causing new mounds and plant damage.

Why mothballs are a poor choice for yard pest control

Mothballs are not designed for outdoor use in garden soil. Their active ingredients are toxic, and placing them in gopher holes adds exposure risk for people, pets, and wildlife that may dig, scavenge, or come in contact with treated material.

Toxicity risks for people, pets, and wildlife

Mothballs contain pesticides. In a yard, those chemicals can end up on paws, fur, and feathers, or be carried into homes on shoes and tracked-in soil. Children and pets can also ingest mothballs or contaminated soil while playing or digging.

Wildlife exposure is another concern. If you have birds, cats, dogs, or other animals that might find and investigate holes, mothballs raise the danger with no reliable control benefit.

Why outdoor use can create environmental problems

Outdoor placement introduces pesticides directly into soil and potentially into runoff. Rain, irrigation, and natural moisture movement shift chemicals through the ground and can affect non-target organisms.

Soil ecosystems include beneficial insects and microorganisms that support healthy plants. Using mothballs for a gopher problem trades one pest issue for broader environmental harm.

Why the law and product labels matter

Most mothballs have specific label instructions that limit how and where they can be used. Using them in or around active gopher tunnels for outdoor pest control often conflicts with label directions.

If the product is not intended for that use, you also increase liability if someone is exposed. Stick to legal, targeted gopher-control options that match the label and your situation.

Safer ways to get rid of gophers

The most effective, safer approach combines exclusion where plants matter, fast population reduction when numbers are growing, and habitat changes that make the yard less rewarding for gophers.

Use physical barriers where plants need protection

Physical barriers work because they block access to roots and crowns. The key is installing them before the animals move in, or immediately around the plants that keep getting hit.

Install 1/2-inch to 1/4-inch hardware cloth around vulnerable areas, keeping it vertical and snug against the bed edge.
Bury the mesh 12 inches deep, then extend an 8- to 12-inch outward apron angled away from the plants.
Seal gaps at corners and overlaps so there is no easy tunnel entry at the barrier line.

Repair any disturbed sections right away, since gophers exploit even small openings.

Trap gophers when you need fast population reduction

Trapping targets the animal directly and is one of the most reliable homeowner options. It also stops the ongoing feeding that causes new mounds.

Identify active tunnels by looking for fresh mounds, newly dug runways, and recent soil displacement.

Pick a main runway, then open a spot at the center of the active line.
Place a gopher trap according to the trap brand instructions, with bait or triggers positioned correctly.
Set the trap near fresh activity, then keep hands clean and check traps frequently per local rules and product directions.

After removal, keep pressure on until you no longer see new fresh mounds.

Reduce food sources and make the yard less attractive

You can lower gopher pressure by removing the incentives that keep them feeding. This will not fix an active infestation overnight, but it reduces how quickly the yard rebounds after control.

Keep grass edges trimmed and reduce dense cover near problem areas.

Remove or relocate high-attractant plants like bulbs and tender roots from heavily targeted zones.
Reduce watering in the immediate problem area if it creates persistent lush growth, since gophers feed heavily in greener patches.
Use mulch carefully, since thick, undisturbed cover can give gophers hiding places and easier access.

Repellents that are safer to consider

If you want a repellent approach, castor-oil-based products are the most common safer option compared to mothballs. Results vary, so treat repellents as part of a broader plan, not the only solution.

How castor-oil-based repellents work

Castor-oil-based repellents work by creating an unpleasant smell and taste for burrowing animals. They are designed for outdoor use and are typically applied around the active zone so gophers avoid the treated area.

Water the area first so the soil is moist enough for the product to spread where gophers travel.

Apply the repellent as directed, typically around fresh mounds, runways, and vulnerable plant edges.
Reapply after heavy rain or irrigation events, since wash-off reduces effectiveness.
Pair repellents with trapping or barriers if you see repeated fresh damage.

Where sonic devices fall short

Sonic devices claim to repel with sound and vibration, but gophers live in tunnels where sound transmission is limited. Soil type, tunnel depth, and moisture change how far any vibration travels.

Homeowners often report inconsistent results, especially when gophers have established deep runs or multiple entrances. If you use sonic units, treat them as experimental and do not rely on them as your only control method.

Which home remedies are worth skipping

Many home remedies focus on strong smells, toxic substances, or putting irritants into holes. Those include improvised “chemical” mixtures, ammonia, and other substances that can harm plants and create unsafe exposure.

Skip anything that is not labeled for outdoor pest control in soil. If you want a low-risk alternative, use labeled repellents for the target area, or use barriers and traps that directly address active gophers.

How to spot gopher activity early

Catching the problem early saves plants and reduces how many tunnels you have to manage. Learn the signs of fresh activity, then track it long enough to target the main runs.

Fresh mounds versus old activity

Fresh gopher mounds look different from abandoned ones. New mounds have loose, lighter soil piles with recently disturbed texture. Older mounds tend to settle, blend into the surrounding ground, and lose their sharp edges.

Look for repeated mound formation in the same general area. If you see new mounds within days, you have active gophers, not just old signs.

Tunnel collapse, plant damage, and root clipping

Gophers damage plants by eating roots and underground stems. You may notice wilting with no clear above-ground cause, plants that suddenly loosen, or stems that appear clipped near the soil line.

Tunnel collapse is another clue. When a runway is near the surface, it can cave in after heavy watering or foot traffic. Fresh soil disturbance plus damaged plants points to active tunnels you should address quickly.

When a problem is bigger than one animal

One gopher can create a lot of damage, but multiple animals amplify the issue. Watch for mounds appearing in different directions across your yard, new runways under separate plant clusters, and repeated digging at more than one time of day.

If you set traps and still see fresh mounds daily, assume you have more than one active animal and adjust the plan. You can also reduce the chance of reinvasion by removing the food and cover that keep multiple gophers in place.

A simple gopher-control plan for homeowners

Use a short, organized plan so you stop the damage and avoid wasting effort on ineffective methods. The goal is to identify activity, choose one main tactic, and measure results based on new mounds and plant recovery.

Start with identification and mound mapping

Begin by learning where gophers are working. Spend a few minutes walking the yard and marking activity zones so you can target the correct tunnels.

Walk the property and note each fresh mound location on a simple map or sketch.
Look for the main runways connecting mounds, especially near fences, garden beds, and shrub lines.

Focus first on the area with the newest soil and the most plant damage.
Recheck the mapped points after 24 to 48 hours to see which spots remain active.

Choose one main control method and track results

Pick one primary method instead of mixing several unproven actions. Tracking should be simple, based on new activity and how well plants hold up.

If you need quick reduction, use traps along active runways.
If certain plants keep getting hit, install barriers around those vulnerable areas.
If you use repellents, apply them to the active zone and commit to reapplication after rain or irrigation.

Track changes by counting new fresh mounds each day for at least 1 week.

Know when to call a licensed professional

Some situations are too large for DIY-only efforts. Call a licensed pest control professional when activity is widespread, the yard has heavy tunneling under structures, or trapping and exclusion are not reducing fresh mounds.

Get help if you have repeated fresh activity despite correct trap placement and consistent monitoring.

Call if the burrows threaten foundations, patios, or buried utilities.
Seek assistance if local rules restrict trapping methods or if you do not feel confident installing barriers.

Frequently Asked Questions

Do moth balls deter gophers at all?

They may briefly bother some animals with a strong odor, but mothballs are not a reliable gopher control method and usually do not solve an active tunnel problem. In a yard, gophers can move around scent sources through connected tunnels, so you may see brief changes without real control.

Relying on mothballs also creates safety issues because the product contains pesticides. When the goal is to stop fresh digging and plant loss, you need a method that targets gophers directly or blocks access to roots.

Will mothballs get rid of gophers permanently?

No. Even if a gopher avoids one spot for a short time, it can simply tunnel around the odor, and the problem often returns. Gophers continue feeding underground as long as they can access cover and food.

Permanent results come from reducing the active population and making the yard less attractive, using traps, barriers, and habitat changes that address why gophers stay.

Are mothballs safe to put in gopher holes?

No. Mothballs contain pesticides and can be dangerous to people, pets, and wildlife. They are not intended for outdoor pest control in soil, and using them in tunnels increases the chance of chemical exposure through contaminated soil or disrupted holes.

If you want odor-based help, choose a labeled outdoor repellent method instead of mothballs.

What is the safest way to remove gophers from a yard?

Trapping, exclusion for vulnerable plants, and reducing access to food and cover are generally safer and more effective than using mothballs. Trapping removes the active animals, barriers protect the plants that keep getting hit, and yard changes reduce reinvasion pressure.

Your safest plan usually combines one primary control method with supportive steps that reduce the reasons gophers keep returning.

Do ultrasonic or scent repellents work better than mothballs?

They may be less hazardous, but results are often inconsistent. For active gopher problems, physical control methods usually work better, because they target the animal or block access to roots.

If you use repellents, treat them as part of a broader approach, with reapplication after rain and continued action until fresh mounds stop.