What Temperature Kills Bed Bugs? Heat & Cold (2026)

✅ Reviewed by our prevention editors • Updated June 2026 • 11 min read

Temperature is one of the few things that reliably kills bed bugs, so a natural question is what temperature kills bed bugs? The short answer is that sustained heat above roughly 120°F (about 49°C) and prolonged cold below roughly 0°F (about minus 18°C) will kill bed bugs and their eggs — but the exposure time matters just as much as the temperature itself.

Bed bugs are tough, but they cannot survive temperature extremes when those extremes are held long enough to penetrate their hiding spots and reach the bugs and eggs. The key is that it is not enough for the air to hit a lethal temperature briefly; the bugs themselves, deep in seams and cracks, must reach and hold that temperature for a sufficient time.

In this guide you will learn the exact temperature thresholds for killing bed bugs with heat and cold, how long exposure must last, how to apply each method safely, and the limits of the DIY approach. We will use clear tables and finish with a printable checklist. 💚

What Temperature Kills Bed Bugs? Quick Answer

The quick answer is that bed bugs die from sustained heat above about 120°F (49°C) and from prolonged cold below about 0°F (minus 18°C). At these extremes, both the bugs and their eggs can be killed — but only if the lethal temperature is actually reached by the bugs in their hiding spots and held there long enough. Brief exposure or temperatures that do not fully penetrate will not do the job.

So the two-part answer is: heat above roughly 120°F or cold below roughly 0°F, sustained for enough time. The exact time depends on how far the temperature is past the threshold — hotter or colder works faster, while temperatures near the threshold need longer. Understanding both the threshold and the time is the key to using temperature effectively. Our guide on bed bug heat treatment covers the heat method in depth.

Bed bugs die from sustained heat above about 120°F or prolonged cold below about 0°F — but the temperature must reach the bugs in their hiding spots and hold long enough.

The Heat Threshold

The heat threshold for killing bed bugs is around 113 to 120°F (45 to 49°C). At about 113°F, bed bugs begin to die, but it takes longer; at around 118 to 120°F and above, death comes more quickly, and eggs — which are a bit more heat-resistant than adults — are reliably killed. This is why professional heat treatments aim to raise the whole space to about 120°F or higher.

The reason heat works is that bed bugs are not adapted to survive these temperatures; their bodies cannot function and they die from the thermal stress. Importantly, the temperature must reach the bugs where they hide — deep in mattress seams, cracks, and furniture — not just the surrounding air. This is the main challenge of heat treatment: getting the lethal temperature to penetrate everywhere the bugs are.

So the practical heat target is to get the bugs themselves, in their harborages, to about 120°F or above. Professionals achieve this by heating a room well above that to ensure penetration. For DIY, the challenge is reaching that temperature in the hiding spots, which is why methods like the dryer and steam (which deliver high heat directly) are more reliable than trying to heat a whole room. Our guide on whether the dryer kills bed bugs covers one practical method.

Heat: How Long It Takes

How long heat takes to kill bed bugs depends on the temperature. Near the threshold (about 113°F), it can take an hour or more of sustained exposure to kill all stages. At higher temperatures (about 120°F and above), death comes faster — often within minutes once the bugs actually reach that temperature. So hotter is faster, but the bugs must reach the temperature, which takes time to penetrate hiding spots.

This is the crucial nuance: the air or surface may hit the target temperature quickly, but the bugs deep in a mattress or piece of furniture take longer to heat up to that temperature. So a successful heat treatment holds the lethal temperature long enough for the heat to soak all the way into every hiding spot and hold there. Professionals often maintain heat for hours to ensure this penetration.

For DIY methods, this means giving enough time: a full hot dryer cycle, sustained steam contact, or extended exposure. Cutting the time short risks leaving bugs or eggs that did not reach the lethal temperature long enough. Time and penetration are as important as the peak temperature. Our guide on the bed bug laundry guide covers timing for laundry heat.

Heat Temperatures and Times

Temperature	Effect on Bed Bugs
Below 113°F (45°C)	Not reliably lethal — bugs can survive
113°F (45°C)	Lethal with extended exposure (an hour or more)
118-120°F (48-49°C)	Kills bugs and eggs more quickly
120°F+ (49°C+)	Reliable target — death in minutes once reached
Professional heat (whole room)	Heated well above 120°F for penetration

Higher heat works faster, but it must reach the bugs in their hiding spots.

Ways to Apply Lethal Heat

There are several ways to apply lethal heat to bed bugs. The clothes dryer on high heat is one of the most accessible — it can kill bugs and eggs in fabrics and many washable or dryer-safe items. Steam delivers high heat directly to surfaces and into seams and crevices, killing on contact where it reaches. And professional heat treatment heats an entire room or home to a lethal temperature, reaching bugs throughout the space.

Each method has its place: the dryer for fabrics and small items, steam for spot-treating mattresses, furniture, and cracks, and professional heat for whole-room elimination. For DIY, combining the dryer (for items) and steam (for surfaces) covers a lot of ground, while professional heat is the option for treating an entire space at once.

The common principle across all of them is reaching the lethal temperature in the bugs hiding spots and holding it long enough. Whichever method you use, that is the goal. Choosing the right method for each item and surface makes heat an effective tool. A steamer can handle surfaces — you can view steamer options on Amazon. Our guide on bed bug steamers covers steam in detail.

The Dryer as a Heat Tool

The clothes dryer is one of the most practical heat tools for bed bugs because it easily reaches and holds a lethal temperature. Running infested fabrics — clothes, bedding, curtains, soft toys — through a hot dryer cycle (typically the highest heat the items can tolerate) for a sustained period kills bed bugs and eggs in those items. The tumbling and sustained heat together ensure penetration.

The dryer works because its high heat well exceeds the roughly 120°F threshold, and a full cycle holds that heat long enough to kill all stages. It is especially useful for laundry and any dryer-safe items, and it is a cornerstone of bed bug laundry routines. Items that cannot be washed but can tolerate dryer heat can often still go through a hot cycle.

The main limits are that the dryer only treats items that fit and can tolerate the heat — it cannot treat the mattress, furniture, or room. So it is one tool among several, ideal for fabrics. Pair it with steam and other methods for surfaces it cannot handle. Our guide on storing clothes after treatment covers keeping heat-treated items safe.

Steam for Spot Heat

Steam is an excellent way to deliver lethal heat directly to surfaces and into the cracks and seams where bed bugs hide. A steamer produces heat well above the lethal threshold, and applied slowly to mattress seams, furniture, baseboards, and crevices, it kills bugs and eggs on contact where the steam reaches. This makes steam ideal for spot-treating the surfaces a dryer cannot handle.

The key to effective steaming is going slowly enough for the heat to penetrate and reach the bugs — moving too fast leaves spots that did not get hot enough for long enough. You want the steam to actually heat the hiding spots to a lethal temperature, which means deliberate, overlapping passes. Steam also has the advantage of leaving no chemical residue.

Steam limits are that it only kills where it reaches — bugs deep inside a mattress or behind a wall may not be touched — and surfaces must tolerate moisture and heat. So steam is a powerful spot tool, best combined with other methods for a complete approach. Used carefully, it brings lethal heat right into the harborages. Our guide on getting rid of bed bugs covers combining methods.

The Cold Threshold

Cold also kills bed bugs, but it requires lower temperatures and longer times than many people expect. The cold threshold is around 0°F (minus 18°C) — bed bugs and their eggs can be killed at this temperature, but it must be sustained for an extended period (typically several days) to be reliable. Temperatures just below freezing (32°F) are not cold enough to kill bed bugs quickly; they can survive moderate cold for a while.

This is why simply putting items outside in winter often fails unless it is consistently very cold — bed bugs are surprisingly cold-tolerant and can survive temperatures that feel frigid to us. To reliably kill them with cold, you need a true deep-freeze level of about 0°F held for long enough, which usually means a home freezer set cold enough or a stretch of genuinely sub-zero weather.

So the cold answer is about 0°F or below, sustained for days. This makes cold a useful method for items that fit in a freezer, but a slower one that requires patience and a cold-enough freezer. Knowing the real threshold prevents the common mistake of assuming any cold will do. Our guide on whether bed bugs survive cold covers their cold tolerance.

Cold: How Long It Takes

Cold takes much longer than heat to kill bed bugs. At about 0°F (minus 18°C), it typically takes several days — often around three to four days or more — of sustained cold to reliably kill all stages, including the more resistant eggs. The colder it is below 0°F, the faster it works, but near the 0°F threshold, you need a sustained multi-day exposure.

As with heat, the temperature must actually reach the bugs throughout the item, not just the surface. A thick or insulated item takes time to cool all the way through to the lethal temperature, so the clock on lethal exposure does not start until the center of the item reaches 0°F. This is why several days is recommended — it accounts for both the kill time and the cooling-through time.

For freezer treatment, this means leaving items in a freezer set to 0°F or below for at least several days, ideally up to a week for thick items, to be safe. Rushing it risks survivors. Cold is effective but demands patience and a cold-enough, reliable freezer. Our guide on bed bug survival covers their resilience.

Cold Temperatures and Times

Temperature	Effect on Bed Bugs
Just below 32°F (0°C)	Not reliably lethal — bugs tolerate moderate cold
0°F (minus 18°C)	Lethal if sustained several days
Below 0°F	Faster kill, still needs sustained exposure
Home freezer (0°F or below)	Effective for items, several days to a week
Brief cold exposure	Often survivable — bugs are cold-tolerant

Cold works but is slower than heat and needs about 0°F sustained for days.

Limits of DIY Temperature Treatment

DIY temperature treatment is effective for what it can reach, but it has real limits. The dryer and freezer only treat items that fit and can tolerate the temperature — they cannot treat your mattress, large furniture, or the room itself. Steam treats surfaces it touches but not bugs hidden deep inside or behind walls. So DIY temperature methods handle items and accessible surfaces but cannot, on their own, treat an entire infested space.

The other limit is penetration and consistency: getting a whole-room DIY heat treatment to a reliable, penetrating 120°F is very hard without professional equipment, and space heaters are a serious fire risk and not recommended for this. Similarly, cold requires a freezer cold enough and time. So DIY temperature is best as part of a broader plan, not the whole solution for a significant infestation.

This is why temperature methods are usually combined with other measures — encasements, interceptors, vacuuming, and thorough inspection — and why larger infestations often need professional treatment. Use DIY temperature for what it does well, and recognize where its reach ends. Our guide on DIY bed bug treatment covers combining methods. Alongside temperature methods, seal the bed with a mattress encasement (view on Amazon) to trap any survivors, and monitor with interceptors (see options on Amazon) to confirm the treatment worked.

When to Use Professional Heat Treatment

Professional heat treatment is worth considering when an infestation is established or widespread, because professionals can heat an entire room or home to a penetrating lethal temperature that DIY methods cannot safely achieve. They use specialized equipment to raise and hold the whole space well above 120°F, reaching bugs in places you cannot treat item-by-item, often in a single treatment.

The advantages are reach and thoroughness: whole-room heat penetrates walls, furniture, and belongings throughout the space, killing all stages at once without chemicals. This makes it especially valuable for heavy infestations or situations where item-by-item treatment is impractical. It does require preparation and professional equipment, which is why it is a professional service rather than a DIY method.

So if your infestation is beyond what dryer, freezer, and steam can handle, professional heat treatment is a strong option. For smaller or early situations, DIY temperature methods combined with other measures may suffice. Knowing when to escalate saves time and frustration. Our guide on choosing an exterminator covers selecting a pro.

Common Mistakes (and Fixes)

• Mistake: Assuming any heat or cold works. Fix: you need about 120°F+ heat or 0°F cold, sustained long enough.
• Mistake: Cutting exposure time short. Fix: hold the temperature long enough to penetrate hiding spots.
• Mistake: Putting items outside in mild winter cold. Fix: bugs tolerate moderate cold — you need about 0°F for days.
• Mistake: Using space heaters for DIY room heat. Fix: this is a fire hazard — use a dryer, steam, or a professional.
• Mistake: Relying on temperature alone for a big infestation. Fix: combine with other methods or call a pro.

Expert Pro Tips

• Aim for 120°F+ with heat. It kills bugs and eggs quickly once reached.
• Aim for 0°F for days with cold. Bed bugs are surprisingly cold-tolerant.
• Give time for penetration. The bugs in hiding must reach the lethal temperature.
• Combine methods. Dryer for fabrics, steam for surfaces, freezer for small items.

Temperature is one of the surest bed bug killers — but the magic is not just the number on the thermometer. It is holding that lethal heat or cold long enough to reach the bugs where they hide.

Real-Life Scenarios

The hot dryer routine. Maya ran all her bedding and clothes through a full hot dryer cycle, well above 120°F, killing the bugs and eggs in her fabrics. She paired it with steam on the mattress seams.

The failed winter freeze. Tom put an infested bag outside in mild winter weather for a day, but it never got near 0°F, so the bugs survived. He switched to a deep freezer at 0°F for several days, which worked.

The whole-room heat. Dana had a widespread infestation that DIY could not reach. A professional heat treatment raised the whole room well above 120°F, penetrating the furniture and walls to kill the bugs throughout.

Frequently Asked Questions

What temperature kills bed bugs?

Sustained heat above about 120°F (49°C) and prolonged cold below about 0°F (minus 18°C) kill bed bugs and their eggs — as long as the temperature reaches the bugs in their hiding spots and is held long enough.

How long does heat take to kill bed bugs?

At about 120°F and above, bugs die within minutes once they actually reach that temperature. Near the threshold (about 113°F), it can take an hour or more. The heat must penetrate hiding spots, which takes additional time.

Does cold kill bed bugs?

Yes, but it is slower. Bed bugs are cold-tolerant, so you need about 0°F (minus 18°C) sustained for several days to reliably kill all stages. Mild cold just below freezing is often survivable.

Will putting items in the freezer kill bed bugs?

Yes, if the freezer is at 0°F or below and items stay in for at least several days (up to a week for thick items), to allow the cold to penetrate all the way through and kill the bugs and eggs.

Can I heat my whole room to kill bed bugs myself?

Safely reaching a penetrating 120°F throughout a room is very hard without professional equipment, and space heaters are a fire hazard. For whole-room heat, use a professional. DIY heat is best with a dryer and steam for items and surfaces.

Does the dryer get hot enough to kill bed bugs?

Yes. A hot dryer cycle well exceeds the roughly 120°F threshold and, run for a full cycle, kills bed bugs and eggs in fabrics and dryer-safe items. It is one of the most practical heat tools.

Final Verdict + Checklist

What temperature kills bed bugs? Sustained heat above about 120°F (49°C) and prolonged cold below about 0°F (minus 18°C) will kill bed bugs and their eggs — but the temperature has to reach the bugs in their hiding spots and hold there long enough. Heat works fast once it penetrates (minutes at 120°F+), while cold is slower (days at 0°F) because bed bugs are surprisingly cold-tolerant. The most practical tools are a hot dryer for fabrics, steam for surfaces and seams, and a deep freezer for small items, while whole-room heat is a professional job. Combine temperature methods with encasements, interceptors, and inspection, and escalate to a pro for big infestations.

This guide is educational and prevention-focused. It does not provide medical advice. For established infestations, consider a licensed professional. Some links may earn us a small commission at no extra cost to you.