How long can bed bugs live without feeding? 20 to 400 days
Starved bed bugs in a 79°F study lived two weeks to under five months, and pesticide-resistant bugs collected from infestations never passed 80 days.
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In a heated home, most bed bugs that can’t feed die within one to four months, and newly hatched nymphs go first (University of Kentucky Entomology). Leaving the house empty for a few weeks will not starve them, and the 400-day figure you keep seeing comes from bugs held in cool laboratory conditions.
Temperature does most of the work. Humidity and life stage shift the count from there, with older nymphs outlasting younger ones (UC IPM Pest Notes: Bed Bugs).
Where the 400-day number comes from
Survival without a blood meal runs from 20 to 400 days depending on temperature and humidity. Adults have lived past 400 days in the lab at low temperatures (UC IPM bed bug guidance). Both figures hold up.
The longest records are decades old. In a 1941 study by Omori, starved adult females averaged 277 days at about 64°F and lasted as long as 425 days at 50°F. A 2011 Virginia Tech paper notes that websites quoting a year or more rarely mention temperature, and that the long survival times were most likely recorded below about 52°F (Polanco, Miller and Brewster, Insects, 2011).
| Figure you’ll see | Where it comes from | Conditions behind it | What it means in a heated home |
|---|---|---|---|
| 20 to 400 days | UC IPM | Across temperatures and humidity levels | The full spread, not a typical bedroom |
| More than 400 days | UC IPM | Adults in a lab at low temperatures | Possible only in cold storage |
| 425 days | Omori 1941 | Adult females at 50°F | Unheated space only |
| 277 days (average) | Omori 1941 | Adult females at about 64°F | A cool room left unheated |
| Up to a year or longer | University of Kentucky | 55°F or below | Unheated storage |
| 1 to 4 months | University of Kentucky | Temperature-controlled buildings | The typical case |
| 80 days at most | Polanco 2011 | Bugs collected from an apartment and a hotel, held near 79°F | Warm rooms with pesticide-resistant bugs |
Sources: UC IPM; Polanco et al. 2011, which also reports the Omori data; University of Kentucky ENTFACT-636.
How long do they last at room temperature?
At about 79°F, starved bed bugs in a Virginia Tech study lived from roughly two weeks to under five months. Newly hatched nymphs, the only stage that had never fed, averaged 13.8 to 36.3 days. Older nymphs and adults lasted longest, averaging 41.5 to 142.6 days depending on the strain (the 2011 Virginia Tech starvation study).
Those bugs were kept at 69% humidity and checked daily until the last one died.
Why bugs collected from homes died sooner
Two of the four strains came from infestations, one from apartments in Richmond, Virginia, and one from a hotel room in Cincinnati. Both were highly resistant to pyrethroid insecticides, and neither had a bug survive past 80 days. At every stage, the resistant bugs lived one half to one third as long as the same stage from susceptible lab colonies.
The longest survival times in the study belonged to those susceptible colonies, a type rarely found in homes (Polanco et al.).
Cool storage stretches the clock
If the infested couch went into an unheated storage unit for the winter, the longer figures in the table are the ones that apply to it. A cool room slows bed bugs down well before it kills them.
Cold does kill them when it is held. Below 32°F, it has to last on the order of one to two weeks (Kentucky’s bed bug fact sheet). Setting belongings outside or opening the windows in winter is unlikely to work. The cold rarely lasts long enough, and sun and daily temperature swings give the bugs a way through (University of Minnesota freezing guidance).
Turning a heated home’s thermostat down, or up, fails as well (ENTFACT-636).
Leaving home to starve them rarely works
Kentucky’s extension entomologists describe leaving a home unoccupied to starve an infestation as usually impractical.
Starving bed bugs by moving out seldom succeeds. Unfed adults and older nymphs in a heated building can outlast a typical stay away by months. In an empty apartment they often spread to nearby units or stay quiet until someone moves back in. Pets left behind can keep them fed, since bed bugs also bite dogs, cats, birds and rodents (University of Kentucky Entomology).
For renters: Once a bed bug is confirmed, tell your landlord, because the units near yours should be inspected too (EPA bed bug control steps). Who pays for treatment depends on state and local housing rules (EPA bed bug laws and regulations). Your local housing agency or an attorney decides how those rules apply to your lease, and the guide to who pays for bed bug treatment in a rental covers that question.
Sealed bags, encasements and the one-year mark
Waiting a year is the slow route, meant for things that can’t go in a dryer or freezer. Untreatable items go into a sealed plastic bag or storage container for up to a year so any active bugs inside are dead. Checking for bed bugs continues for at least a year after treatment (EPA do-it-yourself bed bug control).
Mattress and box spring covers that seal work on the same principle: bugs trapped inside die there. Eggs sealed in with them hatch in about a week at room temperature (ENTFACT-636), and the nymphs that emerge have nothing to feed on.
Items that tolerate heat or cold can be cleared in days instead:
- Dryer: a clothes dryer on medium-to-high heat for 10 to 20 minutes kills every life stage. It works faster if the items go in dry (ENTFACT-636).
- Freezer: this works only if the freezer holds 0°F, which many refrigerator freezers don’t. Confirm the temperature with a thermometer and bag the items first. EPA’s current page lists three days at that temperature, and the University of Minnesota sheet says at least four, so four days meets both (EPA; University of Minnesota).
- Hot car: black plastic bags in a hot, closed car in the sun can work, depending on your climate, and may fail (EPA guidance).
Bulky furniture and whole rooms are a different matter. The guide to what heat does and doesn’t kill covers the temperatures involved.
Safety: Raising the thermostat, or heating a room with a propane space heater or a fireplace, does not kill bed bugs and is dangerous (EPA). Whole-room heat is done by pest management professionals using heaters, fans and temperature sensors (ENTFACT-636). If you hire one, ask for the company’s state pesticide license number and whether the price includes follow-up visits and monitoring.
Your next step: check what’s still alive
Put interceptor cups under the legs of the bed and sofa. Look at them, and at the mattress seams, at least every 7 days. Any find means some bugs were missed or eggs have hatched (EPA inspection guidance). The comparison of interceptors that catch the most bugs helps you pick a style.
Most belongings can be kept (ENTFACT-636), so check whether a mattress needs to go before hauling anything to the curb. Bed bugs have never been shown to transmit human disease (UC IPM).
When weeks of checks come up empty, how to tell bed bugs are gone sets out how long to keep watching. The full bed bug treatment plan covers what to do if they turn up again.
