Five weeks to four months, depending on temperature and how often it feeds. A bed bug passes through five nymphal stages, each requiring at least one blood meal before it can molt to the next, and development runs quickest between 70 °F and 82 °F.
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How often do bed bugs feed, and for how long?
Every five to ten days is the typical interval, in a single feeding lasting three to ten minutes during which a bed bug takes up to six times its own weight in blood. Adults can live a year or more and produce up to four generations annually — which is why a small, unnoticed population can become a large one within a single season.
How long can a bed bug survive without feeding?
This is genuinely contested, and the honest answer depends heavily on temperature. Federal guidance says several months; an extension source cites 20 to 400 days depending on temperature and humidity, with lab specimens surviving over 400 days at low temperatures; Cornell cites over a year. Peer-reviewed measurement at ordinary room temperature (about 26 °C) found first instars surviving 13.8 to 36.3 days and fifth instars and adults 41.5 to 142.6 days — roughly six weeks to five months for the longest-lived stages.
The gap matters: the multi-month and "over a year" figures come from cold laboratory conditions, and applying them to a heated bedroom overstates how long an infestation can go dormant.
Does pesticide resistance change how long they survive?
It shortens it, in the one study that measured both. Every immature and adult stage of the pyrethroid-resistant strains in that research starved to death sooner than the susceptible strains did — a fitness cost of resistance that gets far less attention than the resistance itself.
Sources
4 cited- Egg-to-adult timing, nymphal stages, feeding and lifespan: UC IPM Pest Notes Publication 7454, Bed Bugs, May 2013 (checked 2026-08-18).
- Federal survival estimate: CDC & EPA, Joint Statement on Bed Bug Control in the United States, 2010 (checked 2026-08-18).
- Cornell survival estimate: Cornell / NYS IPM, Bed Bug FAQs (checked 2026-08-18).
- Room-temperature survival measurement and the resistance fitness cost: Polanco, Miller & Brewster 2011, Insects 2(2):232–242, doi:10.3390/insects2020232 (checked 2026-08-18).