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3 Best Outdoor Roach Killers

Roaches roaming outside the house, especially at night on the patio and backyard, can be a real nuisance. The outdoor roaches tend to move indoors and cause a full-blown infestation, but they can also ruin your backyard parties and BBQs.

Interestingly, some of the best roach killers, such as traps and roach killer spray, work best indoors but fail to get rid of roaches outdoors. Therefore, you must get your hands on the best outdoor roach killer to solve your roach problem all at once.

I have tried and tested some of the outdoor roach killers. In addition, I have extensively reviewed them based on various factors such as effectiveness, availability, cost-effectiveness, residual effect, safety profile, and eco-friendliness.

Here are my recommended top 3 best outdoor roach killers,

  1. Ortho Home Defense Insect Killer (Efficient, easy to use, and have an excellent residual effect but beware of counterfeits)
  2. TERRO Crawling Insects Killer (Kill roaches very effectively and can also kill other pests, including fleas, ants, and spiders but is not fit around pets and children)
  3. Safer Diatomaceous Earth (Very safe around pets and children but creates a mess, needs repeated application, and becomes useless in water)

Before you read further, just a quick question. Tired of cockroaches and looking for a permanent solution?

Stop wasting your time, invest in these products and follow this guide: How to get rid of roaches? You will be roach-free in 10-20 days.

1. Max Force Glue Traps
2. Advion Gel Baits
3. Harris Powder Bait
4. Gentrol Insect Growth Regulator
5. Loctite Foam Sealent

Optional Items
1. Gel Bait Professional Gun
2. Torch
3. Powder Bait Puffer
4. Insecticide Spray to kill a reveled colony in a single shot

List of the best Outdoor Roach Killer

Every product on Amazon with great reviews doesn’t mean that it is always the best. Unfortunately, many sellers on Amazon have opted for fake reviews and often sell counterfeits, or the product is not fit for the buyer.

Therefore, I have personally tested some of the top-rated outdoor roach killers (as testing all of them is impossible) and have tried to review them so that you don’t fall for the wrong product.

Here is the list of outdoor roach killers that I think are the best out there in the market,

1. Ortho Home Defense Insect Killer

Ortho home defense insect killer is no doubt the best outdoor roach killer available on the market. It is a 1.1-gallon container that contains a powerful insecticide.

I found this product effective against roaches and several insects, including ants, aphids, armyworms, beetles, black widow spiders, brown recluse spiders, and caterpillars.

Ortho Home Defense is the best outdoor roach killer because,

  1. It has a lasting residual effect (Killing roaches and baby nymphs for up to 5 months).
  2. It does not leave stains on walls nor destroy the paint.
  3. It has no smell, so it can also be used inside the kitchen, bedroom, etc.
  4. It comes with a prepacked electric spray, making it easy to use.
  5. The insecticide is hypoallergenic.

In my opinion, all these factors compel me to list it as the best outdoor roach spray.

To use it, apply a 4-inch barrier around baseboards, cabinets, windows, and other infested surfaces.

FactorsOrtho Home Defense Insect Killer
Ease of Use8
AvailabilityEasily Available
ConsCounterfeit in the market
Ortho Home Defense Insect Killer (out of 10)

2. TERRO Crawling Insects Killer

Terro Crawling insects killer is an amazing product to get rid of roaches outside the house. It comprises small granules that must be spread across the property, covering vegetation, corners, and roach hiding places.
I found the Terro insect killer an effective outdoor roach killer. It effectively killed cockroaches, ants, fleas, and other bugs within 24 to 32 hours of use. However, you must apply a small quantity of water for it to effectively works, or else it fails to give good results.

1 lb of granules effectively covers an area of 350 sq feet. Applying a thin layer renders Terro insect killer useless. However, one thing that I didn’t like about the product is that it had very small to no residual effect. Just after 15 to 25 days, I saw roaches crawling again.

Moreover, it id not fit around pets, children, and vegetables. Therefore, you must be cautious when using it.

FactorsTERRO Crawling Insects Killer
Ease of Use7
AvailabilityEasily Available
ConsIt becomes useless when wet
TERRO Crawling Insects Killer (out of 10)

3. Safer Diatomaceous Earth

if you are looking for the best outdoor roach killer that is a pet and children safe roach killer, Safer Diatomaceous earth powder is for you. It is very safe yet highly effective in killing roaches both indoors and outdoors.

However, Diatomaceous earth powder takes a considerable time to kill roaches as compared to other products. Therefore, this product might not be for you if you are looking for a fast-acting Outdoor roach killer.

I used this product to kill roaches outside the house, especially in the backyard and patios where plants are abundant. It gave me good results and successfully killed roaches, bugs, spiders, and ants.

One thing I didn’t like about Diatomaceous earth powder was that it needed to be applied in large quantities. Furthermore, it also needed reapplication after a few days to keep working.

You can read more here on, How to Apply Diatomaceous Earth for Roaches and Bugs: Does it Work?

FactorsSafer Diatomaceous Earth
Ease of Use7
AvailabilityEasily Available
ConsIt becomes useless when wet/needs multiple applications
Safer Diatomaceous Earth (out of 10)

Why are there so many roaches outside my house?

Cockroaches love a warm and humid climate and can’t survive temperatures above 115 or below 32 degrees Fahrenheit. Moreover, cockroaches are attracted to rotting food, filth, and ample damp, dark, and shady hiding places.

If there are so many roaches outside your house, the reasons might be,

  1. Sewerage holes with loose covers outside your house
  2. Uncovered garbage bins sitting around the house
  3. Close neighbors with a heavy roach infestation
  4. Your garden might have plenty of stacked rotting leaves and clutter that attract roaches
  5. Your garden might be damp

You will usually see American and Australian cockroaches outside your house because they are the ones that like to hide in dark and damp areas surrounding the house.

Additional Read!