Best Bed Bug Traps and Interceptors

Bed bug traps and interceptors are valuable tools for both detecting and monitoring bed bug activity. The EPA recommends interceptor traps as an essential part of any bed bug monitoring and management program. They are not a standalone treatment, but they play an important role in any bed bug management plan.

I always tell my clients that interceptor traps are the most underrated tool in bed bug management. In my practice, I install them on every bed leg during initial treatment and check them weekly. They serve double duty -- catching active bugs and providing clear evidence of whether the treatment is working. I have caught infestations as early as a single bug thanks to interceptors.

Types of Bed Bug Traps

Interceptor Traps

Interceptors are the most widely recommended bed bug trap. Research from Purdue Extension has shown that interceptor traps are among the most reliable passive monitoring tools available for bed bug detection. They are placed under the legs of beds and furniture. The design is simple: a shallow dish with smooth inner walls that bed bugs cannot climb out of. Bugs trying to climb up to or down from the bed fall into the trap and become stuck.

Interceptors serve two purposes: they catch bugs that would otherwise reach you while you sleep, and they provide evidence of ongoing activity, which is essential for monitoring the success of treatment.

CO2 Traps (Active Monitors)

These traps mimic a sleeping human by emitting carbon dioxide and sometimes heat. Bed bugs are attracted to these cues and move toward the trap, where they become stuck on a glue board or fall into a pitfall. CO2 traps are more expensive than interceptors but can detect bed bugs even when no one is sleeping in the room.

Glue Traps

Standard glue boards placed along baseboards and under furniture can capture bed bugs that cross them. They are less targeted than interceptors and may catch other insects as well, but they provide additional monitoring capability.

How to Use Interceptor Traps

1. Place one interceptor under each leg of the bed (four per bed).
2. Ensure the bed is the only pathway for bugs to reach you -- move the bed away from walls and ensure bedding does not touch the floor.
3. Check the traps weekly. Count and remove any captured bugs.
4. Clean traps periodically with soapy water and allow them to dry completely.
5. Apply a very light dusting of talcum powder or diatomaceous earth to the inner walls of the trap to make them more slippery.

What Interceptors Tell You

• Bugs in the outer well only: Bed bugs are coming from elsewhere in the room and trying to reach the bed.
• Bugs in the inner well only: Bugs are already in the bed (or mattress/box spring) and are being caught as they leave after feeding.
• Bugs in both wells: Active infestation with bugs established both in the bed and in the surrounding room.
• No bugs for 6-8 weeks after treatment: Strong indication that the infestation has been eliminated.

Limitations of Traps

• Traps do not eliminate infestations on their own. The NPMA stresses that traps are monitoring tools and should be used alongside comprehensive treatment plans.
• Interceptors only work if the bed legs are the only pathway to the bed.
• CO2 traps require ongoing supplies (CO2 cartridges or yeast/sugar mixtures).
• Very small or early infestations may not be detected by passive traps.

DIY Interceptors

You can make basic interceptors from shallow plastic containers (like dog food bowls) nested together and dusted with talcum powder on the inner surface. While not as effective as commercial interceptors, they work in a pinch.

Using Traps as Part of a Treatment Plan

Combine interceptors with mattress encasements, regular vacuuming, and targeted treatments for the best results. Traps provide ongoing monitoring that tells you whether your treatment is working.

See our Complete Guide to Bed Bugs for comprehensive information on identification, prevention, and treatment.

Main Causes

Bed bugs don't come from traps or monitoring failures. They enter homes through travel, secondhand furniture, visitors, and spread from neighboring units in multi-unit buildings. A trap that catches bugs confirms an infestation is present; it doesn't cause it. The most common introduction scenarios are luggage returning from hotels, used mattresses and upholstered furniture brought in from outside, and direct migration from adjacent infested apartments through shared walls and plumbing chases. Understanding the introduction route matters for prevention. If bugs repeatedly appear in traps despite treatment, the source hasn't been addressed. Identifying and eliminating the introduction point, not just placing more traps, is what breaks the cycle.

How to Identify

Interceptor traps provide objective evidence of bed bug activity. A bug caught in the outer well means bugs are traveling from elsewhere in the room toward the bed. A bug in the inner well means bugs are already in the bed (mattress, box spring, or frame) and traveling outward after feeding. Catches in both wells indicate an established infestation in multiple locations. If traps catch bugs but visual inspection finds nothing, focus on the box spring interior, headboard mounting points, and baseboards immediately adjacent to the bed. The trap catch location tells you which direction bugs are coming from, which points you toward the primary harborage site.

Risk and Severity

Increasing trap catches over time mean the population is growing and treatment isn't working. Decreasing catches after treatment confirm the infestation is declining. The risk of relying solely on traps without active treatment is allowing an infestation to grow while you monitor rather than eliminate it. Bed bug populations double rapidly under favorable conditions. A lightly infested bedroom with a handful of bugs in traps can become a heavily infested multi-room situation within a month if traps are the only intervention. Use trap data to inform treatment decisions, not to substitute for them. Traps are a diagnostic and monitoring tool; eliminating the infestation requires heat, chemistry, or both.

Prevention

Keep interceptors in place year-round under every bed leg, even when no infestation is active. Their permanent presence gives you early detection if bugs are introduced, catching small populations before they establish. For prevention, pair interceptors with mattress encasements that deny bed bugs access to the mattress interior. When traveling, inspect hotel room beds before sleeping and keep luggage off the floor. Avoid bringing secondhand furniture home without inspection. In multi-unit buildings, seal gaps around baseboards and electrical outlets to reduce movement between units. Clean interceptors monthly to maintain their slippery inner surfaces and check them on a consistent schedule so you notice changes in catch numbers.

Solutions and Actions

Eliminate bed bugs through an integrated protocol rather than any single method. Encase the mattress and box spring in certified bed-bug-proof covers; this traps any bugs inside the bed and prevents new ones from establishing in the most attractive harborage. Install interceptor traps under every bed leg to monitor activity and intercept bugs traveling to and from the bed. Wash all bedding and recently worn clothing in hot water and dry on high heat for at least thirty minutes. Vacuum mattress seams, baseboards, and cracks daily, disposing of bag contents outside in a sealed container. Apply targeted residual sprays to cracks and crevices, then plan to repeat the whole protocol every seven to ten days for three to four cycles. Heavy infestations or repeated treatment failures warrant a licensed professional with heat or fumigation capability.

Frequently Asked Questions

Do bed bug traps actually work?

Bed bug interceptor traps are effective monitoring tools that capture bugs traveling to and from the bed. While they will not eliminate an infestation on their own, they are valuable for early detection and for measuring the success of ongoing treatment.

Where should I place bed bug traps?

Place interceptor traps under each leg of your bed frame. For monitoring purposes, additional traps can be placed near furniture legs, along baseboards, and near known harborage areas. Ensure bed legs are the only path from the floor to the bed for maximum effectiveness.

How often should I check bed bug traps?

Check traps at least once a week during active treatment. For preventive monitoring, check every two weeks. Regular checking helps you detect new activity early and track the progress of your treatment efforts.

Can I use bed bug traps instead of calling an exterminator?

Traps alone will not eliminate a bed bug infestation. They are monitoring and detection tools, not treatment devices. If your traps are catching bed bugs, professional treatment or a comprehensive DIY treatment plan is needed to address the infestation.