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Does spraying ammonia keep snakes away?

Snakes can be frightening and unwanted visitors in any yard or home. Their sudden appearance can startle and their potential to bite can worry homeowners. Many seek safe, effective ways to deter snakes from taking up residence on their properties or coming inside houses. Using ammonia is one method some employ to try driving snakes away.

How does ammonia affect snakes?

Ammonia is a strong, pungent chemical that irritates snakes’ extremely sensitive senses of smell and taste. Snakes “smell” and interpret their environments predominantly through their tongues, which pick up chemical particles in the air and ground. Ammonia overwhelms their ability to detect more subtle scents and makes an area unpleasant for them.

The powerful fumes cause avoidance behaviors in snakes. Most want to get away from the odorous ammonia as quickly as possible. Any areas sprayed with ammonia or soaked with ammonia-soaked rags are likely to be given wide berth by snakes due to the chemical’s strength and their aversion to it.

Using ammonia to repel snakes

There are several ways people use household ammonia to attempt driving away snakes:

  • Spraying or pouring concentrated ammonia directly onto areas where snakes are frequently spotted. This may irritate and overwhelm any snakes present.
  • Soaking rags, cotton balls, or other absorbent materials in ammonia and leaving them in areas snakes are known to frequent or may hide. The fumes deter snakes.
  • Sprinkling ammonia-filled capsules around a yard to create unpleasant zones snakes will avoid.
  • Adding a small amount of ammonia to water features such as ponds or fountains to make the water unappealing for drinking or soaking.

Outdoors, the goal is making areas so off-putting with ammonia odor that snakes will not enter or linger there. Indoors, soaked rags placed by potential entry points like holes, drains, or under appliances may discourage snakes coming inside.

Where to use ammonia

When using ammonia to repel snakes, focus on applying it:

  • Along the perimeter of homes and structures where snakes may seek access.
  • Near potential outdoor hiding places like woodpiles, debris piles, and dense vegetation.
  • Around the edges of gardens and yards, especially those adjacent to natural areas snakes inhabit.
  • In crawlspaces, basements, and garages prone to snake entry.
  • Around ponds, fountains, and birdbaths where snakes drink.

Targeting these snake hotspots with ammonia can reduce encounters and risks.

Precautions when using ammonia

Take care when using ammonia. The fumes can irritate eyes, airways, and skin:

  • Wear gloves and avoid direct skin exposure when handling ammonia.
  • Never mix ammonia with bleach or other cleaners due to dangerous chemical reactions.
  • Use only in well-ventilated outdoor areas and open windows if using indoors.
  • Avoid inhaling fumes directly and stand upwind when applying.
  • Keep ammonia away from pets and children to avoid eye and respiratory irritation.

Limitations and concerns about ammonia

Some drawbacks exist when using ammonia to repel snakes:

  • Effectiveness fades over time. The strong scent dissipates rapidly outdoors, requiring frequent reapplication.
  • High air temperatures speed evaporation and limit ammonia’s effectiveness.
  • Rainfall washes away ammonia, leaving areas unprotected.
  • Ammonia does not provide long-term control. Snakes may return between applications.
  • It may drive snakes to neighboring yards. Ammonia causes avoidance but does not eliminate snakes.

These factors mean ammonia is often part of an integrated strategy rather than a standalone solution. Persistent snakes may require additional deterrents or removal by wildlife professionals.

More disadvantages of ammonia

  • Unpleasant odor for homeowners from regular use.
  • Can kill vegetation if sprayed directly on plants.
  • Requires cautious handling as liquid concentrate can cause chemical burns.
  • Not pet or child safe if placed indoors within reach.

These increase risks and inconveniences when relying solely on ammonia to repel snakes.

How effective is ammonia at repelling snakes?

Ammonia’s effectiveness depends on several factors:

Factor Effect on Effectiveness
Concentration Higher concentrations more repellent
Frequency of reapplication More frequent = higher effectiveness
Snake species Varies by species sensitivity to odor
Weather conditions Heat, rain reduces effectiveness
Size of treated area Easier to treat small, defined areas

When used properly, ammonia can effectively drive away snakes, but it requires commitment to routine reapplication. Results improve when integrated with removal of snake attractants and sealing access. Ammonia works best as part of a comprehensive snake deterrent plan.

Reports on ammonia’s effectiveness

Anecdotal reports from homeowners are mixed:

  • Some report success repelling individual snakes over short periods.
  • Using ammonia in combination with sealing cracks snakes use to enter basements and garages has prevented recurrence for many.
  • In hot and rainy climates, most note limited ongoing effectiveness outdoors.
  • Some observe snakes shaking their heads and rapidly leaving after ammonia application, indicating strong aversion.
  • A number of homeowners report snakes continuing to enter yards despite ammonia treatment.

Scientific studies are limited. One study found ammonia initially repelled snakes but decreasing effectiveness with repeated exposure. Overall, ammonia shows promise for temporary snake deterrence but inconsistent long-term control.

Is ammonia safe for gardens and lawns?

Ammonia can damage plants and grass when applied directly. The risks depend on factors including:


Straight liquid household ammonia (5-10% ammonium hydroxide) can burn vegetation. Diluted to 1% or less reduces risks.

Exposure time

Brief contact damages fewer plants than extensive exposure. Quickly rinse any overspray off vegetation.

Application method

Spot treatment and avoiding plant contact causes less harm than broadcast spraying.

Plant types

Ferns, roses, and young seedlings are especially sensitive. Grass blades may yellow and whither.

Soil pH

Ammonia lowers soil pH. Repeated use risks soil acidification and nutrient imbalances.

With care, small amounts of dilute ammonia can be used in gardens and lawns. Heavily soaking vegetation increases risks of damage.

Other snake repellents

Ammonia is one of many options for driving away snakes. Some other popular methods include:

Moth balls

The odor repels snakes but must be replaced frequently as it fades. Ingestion can poison pets.


Special stakes vibrate underground to annoy snakes and spur departure. Effective around dens or burrows.

Predator urine

The scent of predators like coyotes signals danger. Multiple commercial repellents available but odors fade quickly.


Dusting sulfur repels snakes through odor and taste. Must be reapplied after rain. Can stain surfaces.

Hot pepper spray

Capsaicin, the chemical in hot peppers, irritates sensitive membranes when ingested or contacted. Some commercial products available.

Onion and garlic

Strong scents irritate snakes when chopped cloves placed around areas. Limited effectiveness when used alone.

For best control, experts recommend integrating multiple deterrents tailored to your specific situation.

Key points on ammonia and snakes

  • Ammonia’s strong odor overwhelms snakes’ senses, causing avoidance.
  • Direct spraying, soaked rags, and diffusing capsules can treat areas.
  • Focus treatment along building foundations, gardens, and known snake paths.
  • Requires regular reapplication as effectiveness fades over time.
  • May deter individual snakes but not provide complete control when used alone.
  • Take safety precautions when handling concentrated ammonia.
  • Dilute before applying to any lawns or gardens to limit potential damage.


Ammonia shows promise for temporarily repelling snakes through strong, unpleasant fumes. However, convenience and effectiveness issues limit its use alone. Integrating ammonia with snake removal, property improvements to reduce hiding spots, and other deterrents can provide better control. With a comprehensive approach, ammonia can play a supportive role in keeping snakes away.