Bed bugs can survive in an empty house for roughly 4 to 6 months under typical conditions, and potentially over a year in cooler environments. The exact timeline depends on temperature, humidity, and the life stage of the bugs. Simply leaving a home vacant is not a reliable way to eliminate an infestation.
Survival Without a Blood Meal
Bed bugs feed exclusively on blood, typically biting every 5 to 7 days when a host is available. When no one is home, they enter a kind of low-energy waiting mode, slowing their metabolism and surviving on stored reserves. According to data from the University of California’s Integrated Pest Management program, bed bugs can go without feeding for 20 to 400 days depending on conditions. Adults tend to outlast younger bugs, with lifespans reaching a year or more even without regular meals.
A real-world study published in PLOS ONE tracked marked bed bugs in a vacant apartment and found that adult males were still being captured 134 days after the unit was emptied. When researchers ended the experiment at 155 days (just over 5 months), they were still trapping live adults and older nymphs. Young nymphs survived at least 4.5 months, and all other life stages made it past 5 months with no human host present. That apartment had temperatures ranging from 18°C to 41°C (roughly 64°F to 106°F), which is a fairly typical range for an unoccupied home through changing seasons.
Why Temperature Matters So Much
The single biggest factor in how long bed bugs last without food is temperature. Cooler environments dramatically extend their survival. In laboratory settings at low temperatures, adults have survived more than 400 days without a blood meal. That’s well over a year. Cold slows their metabolism, meaning they burn through their energy reserves much more slowly.
Warmer temperatures have the opposite effect. Heat speeds up their metabolism, causing them to exhaust their reserves faster and die sooner. This is why professional heat treatments work: raising a room to around 120°F (49°C) and holding it there kills bed bugs within hours. But a house that simply sits at normal room temperature, say 68°F to 75°F, keeps bed bugs in a comfortable middle zone where they can persist for many months.
Humidity also plays a role. Bed bugs lose moisture through their outer shell, and dry conditions can shorten their lifespan. But in a sealed-up house with moderate humidity, dehydration alone won’t eliminate them quickly.
Not All Life Stages Survive Equally
Bed bugs go through five nymph stages before reaching adulthood, and each stage needs at least one blood meal to molt to the next. The youngest nymphs (first and second stage) are the most vulnerable to starvation. They’re small, have fewer energy reserves, and tend to die off within a few weeks to a couple of months without feeding.
Older nymphs are hardier, and adults are the most resilient of all. If you’re hoping to starve out an infestation by leaving a house empty, the youngest bugs will die first, but the adults can hang on for half a year or longer. And since a single surviving female can restart a full infestation once a host returns, even a few survivors are enough to keep the problem alive.
They May Not Stay Put
Bed bugs don’t just sit and wait passively. When starving, they become more active and will travel to find a host. They can’t fly or jump, but they crawl quickly and navigate through wall voids, electrical outlets, and plumbing gaps. In multi-unit buildings like apartments and condos, they readily move between units. The New York State Department of Health notes that bed bugs travel between rooms in apartment complexes and hotels through these shared pathways.
In a standalone house, bed bugs are more contained. But if mice, rats, birds, or even bats are entering the structure, those animals can serve as alternative blood sources. Bed bugs prefer humans, but they will feed on dogs, cats, rodents, and birds when no human host is available. A house with a mouse problem, nesting birds in the attic, or even the occasional raccoon visit could sustain bed bugs well beyond what starvation alone would allow.
Why Vacancy Alone Won’t Solve the Problem
Given that bed bugs can survive 5 months or more under real-world conditions and potentially over a year in cool environments, leaving a house empty is an impractical eradication strategy. You would need to leave it vacant for well over a year to have reasonable confidence that every last bug had starved, and even that assumes no alternative hosts are present.
Professional treatment is far more effective and faster. Heat treatments can clear a home in a single day. Chemical treatments typically require two or three visits spaced a couple of weeks apart to catch bugs that hatch after the initial application. For items like mattresses, zippered encasements can trap bed bugs inside, where they eventually die over the course of about a year. Dryer-safe fabrics and clothing can be cleared by running them through a dryer on high heat for 20 to 45 minutes. Items that can’t be heated can be sealed in plastic bags and placed in a freezer for four days.
If you’re buying or renting a home that’s been vacant, don’t assume it’s safe simply because no one has lived there for a few months. Inspect mattress seams, baseboards, outlet covers, and furniture joints for the telltale signs: small dark spots (fecal stains), shed skins, or the bugs themselves. A home that sat empty for three or four months could still have a thriving population waiting for the next occupant.