Mild weather (21 °C): most dead after about 144 days with no host; cool (13 °C): about 463 days (Johnson 1941; Polanco et al. 2011). Frost: most survive 3 weeks at 0 °C; 3 weeks at −7 to −10 °C kills all (Rukke et al. 2017). Heat: lethal only from about 40 °C at the bugs. Yards: no outdoor colonies — they stay near sleeping hosts (Gaire et al. 2021; CDC).
How long can bed bugs live outside?
Bed bugs don't set up home outdoors, but a stranded bed bug doesn't die straight away either. Outside, it is a bed bug with no one to feed on, so it lasts as long as the weather and its reserves allow. In mild weather around 21 °C (70 °F), most bugs of the hardiest stage are dead after about 144 days; in cool weather around 13 °C, about 463 days (Johnson 1941; Polanco, Miller & Brewster 2011). Hard frost kills them, but only after days to weeks, and summer heat only kills when the bugs themselves reach about 40–50 °C.
So how long can bed bugs live outside? Weeks to months in mild weather, longer in cool weather, and days to weeks in a sustained deep freeze. How long can a bed bug live outside also depends on where it sits: deep in a sofa cushion it is sheltered from sun and frost; on a pavement it is not. The calculator above uses the same survival and kill-time figures as our no-host calculator and temperature calculator, so the numbers match.
Whichever way it's phrased — how long can bed bugs live outdoors, how long can bed bugs survive outside or how long do bed bugs live outside — the useful follow-up question is whether they could find a host. Outdoors, with nobody sleeping nearby, they almost never do.
Can bed bugs live outside?
Can bed bugs live outside for good? Not in the way ants or fleas do. Everything about their biology ties them to sleeping hosts indoors: they "do not rest or reside on their host, but instead shelter in close proximity to the host", typically searching only short distances of under a metre (Gaire et al. 2021), and most live within 8 feet of where people sleep (CDC). Without a host they can't grow, because every nymph needs a blood meal to moult, and females need blood to lay eggs (Johnson 1941). Bed bugs arrive in homes by hitch-hiking "on luggage, clothing, beds, furniture, and belongings" (University of Kentucky), not by crawling in from gardens.
Can bed bugs live outdoors in grass or yards?
Can bed bugs live in grass? There's no evidence of bed bug populations living in lawns, and their behaviour makes it unlikely: grass offers no sleeping host and none of the tight, dry cracks they shelter in. Can bed bugs live in your yard? A few might be dropped there — off a mattress on its way to the bin, or a bag left on a patio — and they could survive for the times shown below if sheltered. But the yard isn't where an infestation comes from or lives.
Do bed bugs live outdoors anywhere, then? Their close relatives do. Bat bugs and swallow bugs live with wild hosts in roosts and nests on buildings, and only wander indoors when those hosts leave (Colorado State University; see our bat bug identifier). Bed bugs themselves can feed on many warm-blooded animals, including poultry, rats and mice (Johnson 1941), so a sheltered building with animals is a different matter from an open garden.
Can bed bugs survive rain?
Can bed bugs survive rain? We found no study testing bed bugs in rain, so there's no sourced answer either way. What is known: humidity itself doesn't harm them — in Johnson's (1941) experiments, survival without food was longest in humid air and shortest in very dry air. A soaked sofa left on the kerb doesn't become safe because it got wet, and you shouldn't rely on rain to kill anything hiding in it.
Bed bugs on outdoor and curbside furniture
The real outdoor risk is furniture moving between homes. Curbside furniture bed bugs are a known route into homes: the University of Minnesota says "Do not bring furniture, mattresses, box springs, or bed frames found on the street into your home", and Kentucky lists secondhand beds and furniture as a common way bed bugs are carried in. A sofa on the pavement has sheltered seams and cushions, so bugs inside it can wait out the times in the table below.
If you are the one throwing it out, make sure nobody else takes it. The EPA says to "destroy it so someone else won't be tempted to bring it into their home": rip covers, remove stuffing, spray-paint "Bed Bugs" on it and have it collected as soon as possible. Kentucky adds that bagging or wrapping items in plastic stops bugs falling off on the way to the curb or dumpster. Don't discard furniture you can treat — "most of them can be treated and saved" (EPA).
Bed bugs on outdoor furniture
Bed bugs on outdoor furniture — garden chairs, patio cushions, hammocks — would be unusual, because people don't sleep there night after night. Cushions brought indoors from a holiday rental or bought secondhand are a different matter; treat them like any other used upholstered item: check the seams, and run removable covers through a hot dryer for 30 minutes (University of Minnesota).
Does leaving a mattress in the sun kill bed bugs?
Not reliably. In a study described by Loudon (2017), mattresses sealed in black plastic in full sun for 9 hours reached over 80 °C on top, but the underside stayed as cool as 36.5 °C — a refuge where bugs survive (Doggett and colleagues). The University of Minnesota says black plastic in the sun "will not get hot enough to kill all the bugs". Smaller items wrapped in plastic on a hot pavement can work, but Kentucky advises a thermometer showing at least 120 °F (49 °C) wherever bugs may be.
Outdoor survival in hot and cold weather
This table shows what the shared bed bug data say for bugs outdoors with nobody to feed on. The last two columns are the same statuses our cold survival calculator gives after 30 and 90 days, so the pages agree:
| Temperature | What happens | After 30 days | After 90 days |
|---|---|---|---|
| 35 °C (95 °F) | No lethal heat; survival shorter than at 28 °C (most dead within 128 days there) | Active | Active |
| 28 °C (82.4 °F) | Most dead after 128 days; longest single bug about 135 days | Active | Active |
| 21 °C (69.8 °F) | Most dead after 144 days; longest single bug about 184 days | Active | Active |
| 13 °C (55.4 °F) | Most dead after 463 days; longest single bug about 562 days | Active | Active |
| 7 °C (44.6 °F) | Most dead after 367 days; longest single bug about 460 days | Slowed / inactive | Slowed / inactive |
| 0 °C (32 °F) | Inactive below 9.5 °C, but not reliably killed | Slowed / inactive | Slowed / inactive |
| -5 °C (23 °F) | Inactive below 9.5 °C, but not reliably killed | Likely dying | Likely dying |
| -10 °C (14 °F) | Killed after 3 weeks held at that temperature | Likely dead | Likely dead |
| -20 °C (-4 °F) | Killed after 48 hours held at that temperature | Likely dead | Likely dead |
- Hot weather: air temperature rarely kills bed bugs. Even at 35 °C (95 °F) the heat itself is not lethal — kill times start at 40 °C for adults and 41 °C for eggs (Johnson 1941, citing older studies). Warmth does make them use up reserves faster, so starvation comes sooner: most are dead within about 128 days at 28 °C. Surfaces in direct sun get much hotter than the air, but bugs hide in shaded seams.
- Mild weather (13–28 °C): survival without food is longest in cool, damp conditions — about 463 days for most at 13 °C.
- Cold above −7 °C: bugs stop moving below about 9.5 °C (Johnson 1941) but most survive weeks: most survived 3 weeks at 0 °C (Rukke, Hage & Aak 2017).
- Hard frost: 3 weeks at −7 to −10 °C killed all of them in the lab (Rukke et al. 2017); below −20 °C, 48 hours (Olson et al. 2013). Outdoors, temperatures swing between day and night, and the inside of furniture lags behind the air.
The EPA's summary fits: putting things outside in freezing temperatures "could kill bed bugs, but there are many factors that can affect the success of this method". For exact kill times, see what temperature kills bed bugs.
Sheltered or exposed
Shelter changes how quickly heat or cold reaches the bugs, not the temperature they need. In freezer tests, insulated items took 1–3 extra hours to reach the lethal temperature (Olson et al. 2013), and a 2.5 kg load of laundry took about 8 hours to cool to −17 °C (Naylor & Boase 2010). A sofa or mattress takes much longer — on a cold night the middle may never get as cold as the air before the day warms it again.
How this outdoor calculator works
- 40 °C and above: the heat kill time for adults and eggs (Kells & Goblirsch 2011; Mellanby 1935; Drenski 1928) — the same function as our temperature calculator.
- 28–40 °C: heat isn't lethal yet, and the starvation studies stop at 28 °C; survival is shorter in warmth, so the 28 °C figure is an upper limit.
- 7–28 °C: average survival without a blood meal for every life stage (Johnson 1941; Polanco et al. 2011): "most dead" is the hardiest stage's high average, and "longest" the longest single bug recorded.
- −7 to 7 °C: inactive but not reliably killed (Johnson 1941; Rukke et al. 2017).
- −7 °C and below: the cold kill time (Rukke et al. 2017; Olson et al. 2013).
- 30 and 90 days: the status from the same winter function as the cold survival calculator (place: outdoors).
Season fills in an example temperature only. Shelter adds a note about insulation; it doesn't change the lethal temperatures. Bed bugs that find a host — a person, pet, bird or rodent — can feed and reset the clock.
Frequently asked questions
How long can bed bugs live outside?
With no host: most are dead after about 144 days in mild weather (21 °C) and about 463 days in cool weather (13 °C). Hard frost kills them in days to weeks.
Can bed bugs live outside?
Not as a colony. They shelter close to sleeping hosts indoors (Gaire et al. 2021; CDC) and spread on belongings, not from gardens (University of Kentucky).
Can bed bugs live in grass or in your yard?
There's no evidence of yard populations. A few dropped outside can survive a while if sheltered, but they need a sleeping host to breed.
Can bed bugs survive rain?
We found no study on rain. Humidity itself doesn't harm them — they lived longest in humid air in Johnson's (1941) tests — so don't count on rain to kill them.
Is curbside furniture likely to have bed bugs?
It can. The University of Minnesota advises never bringing street furniture or mattresses home, and the EPA asks people to destroy and label infested furniture they throw out.
Does hot weather kill bed bugs outside?
Rarely. Heat only kills from about 40 °C at the bugs themselves; warm weather mostly makes them starve sooner.
Does leaving furniture outside kill bed bugs?
Only with sustained hard frost (about 3 weeks at −7 °C) or heat reaching every hiding place. Mild weather just makes them wait.
Do bed bugs come from outside?
Usually not. They are carried in on luggage, clothing, furniture and belongings (University of Kentucky). Bat bugs and swallow bugs can come from roosts and nests on buildings.
Can bed bugs live on animals outside?
They can feed on many warm-blooded animals, including poultry, rats and mice (Johnson 1941), but they don't live on them — they hide nearby.
These calculators give estimates from laboratory studies, for education. Real bed bugs vary with strain, insecticide resistance, humidity and how easily they reach a host. Bed bugs are not known to spread disease (CDC), but if bites trouble you, talk to a doctor or pharmacist. For an infestation, contact a licensed pest professional or your local extension service. We give no pesticide advice.