How long a cockroach will stay in your house depends on species, food, moisture, shelter, and whether you take control measures, but without intervention cockroaches can stay indefinitely and establish long-term infestations because they reproduce quickly and hide in protected areas. German cockroaches, which are small light brown about half an inch with two dark stripes and most common indoor species, can live indoors year-round and stay for months to years if conditions remain favorable, with one female producing up to 300 offspring and colonies growing to hundreds in wall voids, under appliances, and cabinets, so they will not leave on their own and will persist as long as food crumbs, grease, and moisture from leaky pipes or condensation are available. American cockroaches, large reddish brown about one and a half inches often called palmetto bugs that live in drains and basements, can also stay long-term if moisture and entry points remain. Cockroach lifespan varies, German cockroaches live about 100 to 200 days, American cockroaches live up to a year or more. Without control, roaches stay until food and water removed and entry sealed, and they can survive weeks without food and about a week without water. If you do nothing, infestation grows larger over months. With effective integrated pest management including thorough sanitation by storing food sealed and cleaning crumbs daily, fixing leaks, sealing cracks with caulk, and using gel baits containing fipronil or indoxacarb that roaches carry back to kill colony within days to weeks, you can eliminate them in 2 to 6 weeks for moderate infestations, with heavy infestations requiring multiple treatments over months and professional service costing $300 to $800.
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