Quick answer
An adult bed bug can usually live about 1 to 4 months without food in a normal heated or air-conditioned home, and up to a year or longer when it is cool, around 55°F or below. Young nymphs give out sooner, often within a few weeks. In the lab, adults have survived more than 400 days without a blood meal at low temperatures. That is why leaving a home empty for a few weeks almost never starves out an infestation.
Bed bugs feed only on blood, so it seems logical that taking away their food should kill them fast. It does not. They can go months between meals and slow down to save energy when no one is around. How long a bed bug can live without food depends on 3 things: its life stage, the temperature and its strain.
Below: what the research shows for homes, empty houses, cars, luggage and storage, and why “starving them out” usually backfires. Every number comes from university entomologists, the EPA or peer-reviewed studies.
Key takeaways
- In a temperature-controlled home, bed bugs typically survive about 1 to 4 months without feeding, per the University of Kentucky.
- In cool spaces of 55°F or less, they can last up to a year or longer.
- Newly hatched nymphs are the weakest. Older nymphs and adults last the longest.
- Heat shortens survival. Cool, steady temperatures stretch it out.
- Leaving a home empty rarely works. Bed bugs wait, or spread to nearby units.
- Encasements, sealed bags and heat use their need for blood against them far more reliably.
How Long Can a Bed Bug Live Without Food?
The honest answer is a range, because bed bugs are cold-blooded and their survival changes with the room around them. The University of California IPM Program puts the full range at 20 to 400 days without feeding, depending on temperature and humidity. The University of Kentucky narrows it down for real homes: in temperature-controlled buildings, a more typical time without feeding is about 1 to 4 months. The CDC agrees that bed bugs can live several months without a blood meal.
Here is how the sourced figures line up by life stage and by temperature.
Even the shortest bar is about 2 weeks. No common household situation kills every bed bug within days of going hungry.
Nymphs vs Adults: Which Lives Longer Without Blood?
Bed bugs (Cimex lectularius) hatch from eggs and pass through 5 nymph stages before they become adults. UC IPM explains that each nymph stage needs at least 1 blood meal before it can molt to the next stage, and that older nymphs survive longer without feeding than younger ones.
The clearest data comes from a 2011 study by Polanco, Miller and Brewster at Virginia Tech, published in the journal Insects. They starved 4 strains of bed bugs at about 79°F (26°C) and tracked every stage. Average survival looked like this:
| Life stage | Average days without food at about 79°F | What it means |
|---|---|---|
| 1st stage nymph | About 14 to 36 days | Most fragile. A tiny body loses water fast. |
| 2nd stage nymph | About 28 to 68 days | Still weak, but already lasts weeks. |
| 3rd and 4th stage nymphs | About 28 to 124 days | Big jump in staying power. |
| 5th stage nymph | About 44 to 128 days | Among the longest survivors in the study. |
| Adults | About 43 to 99 days | Months, even in a warm room. |
The low end of each range came from field strains that resist common pyrethroid insecticides, which died faster when starved. Even so, those resistant adults averaged about 6 weeks with no food in a warm room.
Eggs do not need to eat. They hatch in about 1 to 2 weeks at room temperature, and the new nymph must then find blood within weeks. Our guide on how long bed bug eggs take to hatch covers that clock in detail. Nymphs are also small and pale until they feed, so it helps to know how big a bed bug is at each stage.
Why Temperature Changes Everything
Bed bugs cannot control their own body heat. When it is warm, their bodies burn energy and water faster, so they run out sooner. When it is cool, everything slows down. Texas A&M AgriLife Extension puts it simply: the warmer the temperature, the shorter the survival time for starving bed bugs.
Cool helps bed bugs, but cold only kills them if it is extreme and sustained. Heat of about 120°F and above kills them. The University of Kentucky says freezing temperatures below 32°F must be kept up for about 1 to 2 weeks, and the EPA says a home freezer must be at 0°F with items sealed inside for 3 days. The old claims of a year or more without food mostly came from bugs kept at low temperatures, as the Virginia Tech researchers point out. In a warm California apartment, months is more realistic.
How Do Bed Bugs Survive So Long Without Blood?
The University of Kentucky calls it unusual for most insects to persist months without feeding. A few traits explain it:
- Big meals. A bed bug feeds for about 3 to 10 minutes, then digests slowly while hidden.
- Low activity. With no host around, they stay tucked in cracks and move very little, saving energy and water.
- Water is the real limit. Blood is their only food and water. Newly hatched nymphs lose moisture fastest, which is why they die first.
- Other hosts. Humans are the preferred host, but the University of Kentucky says bed bugs will also bite dogs, cats, birds and rodents. A home with pets or mice is not truly “without a host.”
When food is available, adults may feed every 5 to 7 days, per UC IPM. A quiet stretch with no bites does not prove they are gone. Not sure the bug you found is a bed bug at all? Check it against our bed bug identification guide.
How Long Do Bed Bugs Live in an Empty House, Car, Luggage or Storage?
The same rules apply everywhere, but each setting changes the temperature, and the temperature changes the answer.
| Place | How long they can last | Why | What to do |
|---|---|---|---|
| Empty house or apartment | Often months. Longer if it is cool inside. | Plenty of cracks to hide in. In shared buildings, bugs can move to nearby units. | Inspect and treat before moving back in or renting it out. |
| Car | Weeks to months, depending on the season | Cars swing between hot and cool. Bugs hide in seams and under seats, away from the hottest spots. | Vacuum seams. Do not rely on a hot day alone. Ask a pro about vehicles. |
| Luggage | As long as in a home, often months | Bags are dark, full of seams and often stored in cool closets or garages. | Dry clothes on high heat. Heat-treat or bag the suitcase. |
| Storage unit or garage | Up to a year or longer if it stays cool | Cool, stable air is ideal for long survival. | Treat items before storing. Keep sealed items closed for up to a year. |
| Sealed plastic bag | About 2 to 5 months to die, sooner in warm weather | No host, no escape. | Texas A&M says isolating items in bags takes 2 to 5 months. |
Empty house. The University of Kentucky says leaving a home unoccupied to starve an infestation is usually impractical. Bugs in vacant units often move to nearby units or lie low until someone returns.
Car. Bed bugs are not common in cars, but they can ride in on bags, coats and used furniture. The University of Kentucky notes a hot car can often heat-treat a suitcase in summer. But heat in a car is uneven, and bugs deep in seat seams may not reach a lethal temperature.
Luggage and storage. The EPA says items you cannot treat can be sealed in a bag or container for up to a year to make sure any bugs are dead. Dry fabrics on high heat before storing them.
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Can You Starve Bed Bugs by Leaving Your Home Empty?
It is the most common hope we hear. Tap each myth to see what the research says.
Starvation does work in one controlled setting: a sealed encasement or bag that keeps bugs trapped away from people for many months. It does not work on a whole home.
What NOT to Do While Waiting for Bed Bugs to Die
Do
- Keep sleeping in your own bed so bugs stay in one place.
- Seal untreatable items in bags or bins and leave them closed for up to a year.
- Dry clothes and bedding on high heat before you pack or store them.
- Use interceptor cups to see if bugs are still active.
- Get a licensed inspection before moving back in or renting a unit again.
Don’t
- Move to the couch or another bedroom. Bugs follow you and spread.
- Set off foggers or bug bombs before you leave. UC IPM says they have been shown to be ineffective.
- Spray rubbing alcohol or gasoline. The EPA links these to house fires.
- Use outdoor or farm pesticides indoors, or pool-grade diatomaceous earth.
- Haul infested furniture to the curb unbagged and unmarked.
Safety first: if anyone feels dizzy, sick or has trouble breathing after a pesticide was used, get them to fresh air and call Poison Control at 1-800-222-1222, or 911 in an emergency. Bring the product label with you.
What Works Instead: Use Their Need for Blood Against Them
Bed bugs can wait a long time, but not forever, and they cannot survive real heat. The best plans use both facts:
- Encase the mattress and box spring. UC IPM says bugs trapped inside encasements will eventually starve. Since adults can survive many months, keep them zipped for at least a year.
- Put interceptor cups under the bed legs. They catch bugs climbing up to feed and tell you whether the population is shrinking.
- Use the dryer. Running clothes and fabrics through a hot dryer kills all stages. The University of Kentucky suggests medium to high heat for 10 to 20 minutes.
- Bag what you cannot heat. Texas A&M says isolating items in bags takes about 2 to 5 months to kill bed bugs, and the EPA suggests up to a year to be sure.
- Freeze small items correctly. The EPA says to seal them in a bag at 0°F for 3 days and check the freezer with a thermometer.
- Call a licensed professional. Heat treatment, targeted products and follow-up visits clear infestations in weeks, not months.
For the full plan, see our guide on how to get rid of bed bugs, and for the hardest stage to kill, what kills bed bug eggs. If you are dealing with itchy marks while you sort this out, compare them with what bed bug bites look like, and see a doctor for any severe reaction.
In California, bed bug treatment must be done by a licensed pest control operator. The Structural Pest Control Board licenses pest control operators, and you can verify a license on its website.
If You Rent in California
California’s bed bug law, AB 551 (California Civil Code sections 1954.600 to 1954.605), matters here because “just leave it empty” is not a legal fix for a rental:
- A landlord cannot show, rent or lease a vacant unit they know has a current bed bug infestation.
- Landlords must give tenants written information about bed bugs and how to report them.
- After a pest control inspection, the landlord must tell affected tenants the findings in writing within 2 business days.
- Tenants must cooperate with inspection and treatment.
If you are a tenant, report bed bugs to your landlord in writing, with photos, and keep a copy. Moving out for a few weeks will not solve it, and bugs may spread to neighbors in the meantime.
Frequently Asked Questions
How long can a bed bug live without food?
In a typical heated or air-conditioned home, about 1 to 4 months. In cool places of 55°F or less, up to a year or longer. Adults have survived more than 400 days in the lab at low temperatures.
How long can a bed bug live without a host?
The same as without food, since a host is their only food. Expect months in a normal home. Pets, birds and rodents can also serve as hosts, so a home without people is not always without a host.
How long can baby bed bugs live without feeding?
Newly hatched nymphs are the weakest. At about 79°F, they averaged about 14 to 36 days without food in a Virginia Tech study. Older nymphs lasted much longer, up to about 4 months on average.
How long can bed bugs live in an empty house?
Often several months, and longer if the house stays cool. Leaving a home empty is usually impractical because the bugs wait or spread to nearby units.
Can bed bugs live in a car?
Yes, for weeks to months, hiding in seams and under seats. Summer heat can kill exposed bugs, but heat inside a car is uneven, so do not count on it to clear an infestation.
How long can bed bugs live in luggage or storage?
Months, and up to a year or longer in a cool storage unit or garage. Dry fabrics on high heat before storing, and keep items you cannot treat sealed for up to a year, as the EPA suggests.
Can I starve bed bugs by leaving my home empty?
Almost never. Adults and older nymphs can outlast weeks or months away, especially in a cool home. Encasements, heat and a licensed professional work far faster and more reliably.
How long should I keep a mattress encasement on?
At least a year. Bugs trapped inside die of starvation, but adults can live many months without food, and longer when it is cool. Check the cover for rips and keep it zipped.
Bed Bug Control CA
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Sources
- University of California IPM Program, Bed Bugs Pest Notes
- University of Kentucky Entomology, Bed Bugs (ENTFACT-636)
- Polanco, Miller and Brewster (2011), Survivorship During Starvation for Cimex lectularius L., Insects 2(2)
- Texas A&M AgriLife Extension, Bed Bugs: Do-it-yourself Control Options
- US Environmental Protection Agency (EPA), Do-it-yourself Bed Bug Control
- Centers for Disease Control and Prevention (CDC), About Bed Bugs
- California Structural Pest Control Board
- California Civil Code sections 1954.600 to 1954.605 (AB 551)