Choosing the best outdoor ant and spider killer depends on where insects are active and how you want to apply treatment. Granules can make a perimeter barrier without a hose, while ready-to-spray products are better suited to treating larger lawn and landscape areas. These five options cover both approaches, with differences in coverage, application, and listed control time.
Table of Contents
Quick Comparison
| Product | Type | Coverage | Control time |
|---|---|---|---|
| Amdro Quick Kill Ant & Spider Killer | Shaker-bag granules | Up to 3,000 sq. ft. | Up to 3 months |
| Ortho Orthene Ant Barrier Granules | Shaker granules | Up to 2,500 sq. ft. | Up to 3 months |
| Ortho BugClear Lawn & Landscape Ready-to-Spray | Hose-end spray | Up to 5,300 sq. ft. of lawn | Long-lasting control; check label |
| Ortho Home Defense Lawn & Landscape Ready-to-Spray | Hose-end spray | Up to 5,300 sq. ft. of lawn | Up to 3 months |
| Ortho Outdoor Insect Killer Concentrate | Concentrate | Up to 5,580 sq. ft. | Up to 3 months |
Our Picks: Best Outdoor Ant And Spider Killer reviews
1. Amdro Quick Kill Ant & Spider Killer: Simple Perimeter Granules
Amdro Quick Kill is a granular insect killer made for outdoor use around lawns, ornamentals, flower gardens, and the home perimeter. Its shaker bag lets you spread the product without mixing it or using separate application equipment, which makes it a straightforward option for treating a defined area.
The 3-pound bag is listed to cover up to 3,000 square feet and provide control for up to three months. The product description says it kills up to 100 insects. That combination makes it a practical fit for people who want a simple barrier treatment rather than a hose-end spray for a whole yard.
Its main limitation is the granular format: it may be less convenient than a ready-to-spray product when you want to cover broad lawn or foliage areas. Measure the treatment area and follow the label for application rates and where the granules may be used.
Pros:
- No mixing or application equipment needed
- Designed for ants and spiders as well as other listed insects
- Covers up to 3,000 square feet
- Listed to last up to three months
Cons:
- Granules may be less convenient for treating large lawns or foliage
- Coverage and results depend on applying it as directed on the label
Verdict: Choose Amdro if you want an easy-to-spread granular treatment for a home perimeter or garden area without mixing or a hose.
2. Ortho Orthene Ant Barrier Granules: A Focused Foundation Treatment
Ortho Orthene Ant Barrier Granules are designed for home perimeters and foundations. The container is applied by holding it parallel to the ground and shaking it from side to side. The label directions call for a 2-foot band around the home, so this format is aimed more at creating a defined barrier than treating an entire landscape.
The 2.5-pound container treats up to 2,500 square feet. The product is listed to kill and prevent ants, spiders, and other insects on its label for up to three months. Its description also names insects such as beetles, centipedes, fleas, and ticks, but check the label for the complete list and use directions.
Compared with Amdro, Orthene has less stated coverage per container, but its application instructions clearly focus on a foundation band. That makes it a useful choice when activity is concentrated near the house rather than spread across a yard. It is not the best match if your main goal is broad lawn or plant coverage.
Pros:
- Designed for home perimeters and foundations
- Simple shake-to-apply format
- Listed control time of up to three months
- Targets ants, spiders, and other listed insects
Cons:
- Coverage is up to 2,500 square feet, less than some alternatives
- Its foundation-focused use may not suit broad yard treatment
Verdict: Pick Ortho Orthene if you want granular control focused on the foundation and a clearly specified perimeter application.
3. Ortho BugClear Ready-to-Spray: Convenient Coverage for Lawns and Landscapes
Ortho BugClear is a ready-to-spray insect killer that connects to a garden hose. It is designed for outdoor use on lawns, home perimeters, ornamentals, flowers, trees, shrubs, and certain listed vegetables and fruit trees. The product description lists 235 insects controlled, including ants, ticks, mosquitoes, fleas, and spiders.
Coverage depends on the area being treated: the product is listed for up to 5,300 square feet of lawn, 1,400 square feet of foundation or perimeter, or 2,700 square feet of foliage. It starts killing within minutes, according to the product description, and provides long-lasting control. The supplied information does not specify a particular duration, so check the product label for treatment intervals.
This is a more flexible choice than granules if you need to treat several kinds of outdoor areas. The trade-off is that hose-end spraying may be more product than you need for a narrow foundation band, and the container’s coverage varies by application area. Check the label to confirm that the plants and locations you plan to treat are included.
Pros:
- Ready-to-spray hose-end applicator
- Suitable for lawns, perimeters, and several landscape areas listed on the label
- Lists control of 235 insects, including ants and spiders
- Provides separate coverage figures for lawn, perimeter, and foliage
Cons:
- Coverage varies substantially depending on the area being treated
- The supplied product information does not give a specific control duration
Verdict: Choose BugClear if you want a hose-end option for a mix of lawn and landscape areas and are comfortable following its area-specific label directions.
4. Ortho Home Defense Ready-to-Spray: Long-Lasting Yard and Perimeter Control
Ortho Home Defense is another hose-end insect killer for outdoor areas. Connect the attached sprayer to a garden hose to apply it to lawns, home perimeters, ornamentals, flowers, trees, shrubs, and certain listed vegetables and fruit trees. Its description lists 235 insects, including ants and spiders.
The product is listed to treat up to 5,300 square feet of lawn, 1,400 square feet of foundation or perimeter, or 2,700 square feet of foliage. It starts killing within minutes and is listed to keep killing ants, spiders, and American dog ticks for up to three months. The spider claim excludes black widows, so this is not the right choice if you need a product specifically labeled for them.
Home Defense is similar in application and coverage to BugClear, but the supplied information gives a specific three-month control claim and names the black widow exclusion. That added detail may help with planning, though the product still requires careful use according to its label.
Pros:
- Hose-end applicator avoids mixing a concentrate
- Suitable for several outdoor areas listed on the label
- Listed to keep killing for up to three months
- Provides separate coverage figures for lawn, perimeter, and foliage
Cons:
- Does not control black widow spiders according to the supplied description
- Hose-end application may be unnecessary for a small, targeted area
Verdict: Choose Ortho Home Defense if you want hose-end coverage for several outdoor areas and value a stated control period of up to three months.
5. Ortho Outdoor Insect Killer Concentrate: High Coverage for Larger Areas
Ortho Outdoor Insect Killer Concentrate is made for yards, gardens, and landscapes. It is a concentrate, so it cannot be applied directly from the container. Read the label for the required preparation and application instructions before using it.
One 32-fluid-ounce container treats up to 5,580 square feet. The product description says it kills 235 insects by contact and creates a barrier for up to three months against listed pests, including ants, fleas, cockroaches, spiders, house flies, scorpions, and American dog ticks. It is intended for use on areas such as roses, ornamentals, vegetable gardens, trees, and lawns when insects or damage first appear, subject to label directions.
Its listed coverage is the highest of the products here, making it worth considering for a larger treatment area. The extra preparation is the key drawback: unlike the ready-to-spray options, you need to follow the label to prepare and apply the concentrate correctly. The spider claim also excludes black widows.
Pros:
- Listed to cover up to 5,580 square feet
- Suitable for several lawn, garden, and landscape areas on the label
- Lists control of 235 insects by contact
- Listed to create a barrier for up to three months
Cons:
- Requires preparation; it cannot be applied directly from the container
- Does not control black widow spiders according to the supplied description
Verdict: Pick the concentrate if you need broad coverage and are willing to prepare and apply it according to the product label.
How to Choose an Outdoor Ant and Spider Killer
Match the application type to the area
Granules are a practical fit for a defined perimeter or foundation band when you want to apply treatment without mixing it or connecting a hose. Ready-to-spray products suit broader lawn and landscape applications, while a concentrate can cover a larger area but requires preparation. Think about where insects are active before choosing a format.
Check coverage for your specific treatment area
Coverage numbers can refer to different surfaces, so compare like with like. A product may cover more lawn than foundation or foliage. Measure the area you plan to treat and use the coverage figure that matches it. Do not assume a listed lawn coverage figure also applies to a home perimeter.
Consider how long control is listed to last
Several options are listed to provide control for up to three months, while BugClear is described as providing long-lasting control without a specific duration in the supplied product details. “Up to” is not a guarantee for every site or condition. Follow the label for application timing and any retreatment instructions.
Review the insect list and exclusions
Products can differ in which insects they list, and a general claim about spiders does not mean every spider is covered. For example, the supplied descriptions for Ortho Home Defense and Ortho Outdoor Insect Killer Concentrate exclude black widows. Check the complete label before buying if you are targeting a particular insect.
Confirm where the product can be used
Some products are intended for home perimeters and foundations, while others also list lawns, ornamentals, flowers, trees, shrubs, or certain edible plants. Use a product only on the locations named on its label, and check any plant-specific restrictions before treating a garden or landscape.
Plan for safe application
Read the full product label before opening or applying any pesticide. Follow its directions for measuring, application, protective equipment, storage, and when people or pets may return to treated areas. Avoid applying a product outside its labeled locations or at a different rate than directed.
Frequently Asked Questions
Which product is easiest to apply without mixing?
Amdro Quick Kill and Ortho Orthene are granular products that do not require mixing. The two Ortho hose-end options are also ready-to-spray, but they require a garden hose. The Ortho concentrate needs preparation and should not be applied directly from its container.
Which option has the largest listed coverage?
Ortho Outdoor Insect Killer Concentrate is listed to cover up to 5,580 square feet. Coverage depends on the treatment area, and its concentrate must be prepared according to the label.
Which products are listed to last up to three months?
Amdro Quick Kill, Ortho Orthene, Ortho Home Defense, and Ortho Outdoor Insect Killer Concentrate are listed to provide control for up to three months. The supplied details for Ortho BugClear describe long-lasting control but do not give a specific duration.
Do these products work on lawns as well as home perimeters?
Use depends on the product. Amdro lists lawns and home perimeters among its uses, while Ortho Orthene focuses on home perimeters and foundations. The ready-to-spray products and concentrate list broader lawn and landscape uses. Check each product label for approved locations and instructions.
Do the Ortho spider-killer products control black widows?
The supplied descriptions for Ortho Home Defense and Ortho Outdoor Insect Killer Concentrate specifically exclude black widow spiders. Check the complete label for the insects covered by any product you are considering.
Can I use an outdoor insect killer on vegetables or fruit trees?
Some of the Ortho lawn and landscape products list certain vegetables or fruit trees as possible treatment areas. That does not mean every plant or crop is approved. Check the label for the specific plants, application directions, and any restrictions before treating edible plants.
Final Recommendation
For an easy granular barrier around a home or garden, Amdro Quick Kill offers a straightforward shaker-bag format and coverage up to 3,000 square feet. For a foundation-focused treatment, Ortho Orthene has clear perimeter application directions. If you need broader lawn and landscape coverage, consider one of the hose-end options; if maximum listed coverage matters and you are comfortable preparing a concentrate, Ortho Outdoor Insect Killer Concentrate covers up to 5,580 square feet. In every case, choose based on the area you need to treat and follow the product label closely.
