Cicadas go quiet because their loud, buzzing calls are tightly regulated by temperature, mating status, predator threats, and the behavior of the chorus around them. What sounds like a wall of noise flipping off like a switch is usually a coordinated response to a specific environmental trigger, not a random event. The mechanics behind that sudden silence are more varied and stranger than most people realize, involving everything from thermal thresholds to parasitic fungi that rewire a cicada’s behavior entirely.
Temperature Acts as a Volume Knob
Cicada calls depend on rapid contractions of specialized muscles attached to a pair of drum-like structures called tymbals on either side of the abdomen. Those muscles are exquisitely sensitive to temperature. When ambient air temperature drops below a certain threshold, the muscles simply cannot contract fast enough to produce sound. For some well-studied European species in the genus Tibicina, the minimum temperature needed to begin calling falls between about 22 and 24 °C, and the power of the call scales with warmth above that floor.1Physiological Entomology. Ambient temperature and sound power of cicada calling songs Different species around the world have their own thresholds, but the pattern holds: when the air cools, the chorus fades.
This explains a lot of the everyday silence people notice. A cloud passing over the sun on a warm afternoon can briefly drop ambient temperature near vegetation by a couple of degrees, and if that pushes conditions below a species’ calling threshold, the noise stops almost instantly. It returns just as fast once the sun comes back. The same mechanism governs the daily cycle: most cicada species start calling after the warmest part of the morning and taper off as evening temperatures slide. If you have ever noticed the drone cutting out right around dusk, temperature is almost certainly the reason.
Synchronized Choruses and Coordinated Silence
Cicadas do not call independently. Males in a given area form a chorus, and that chorus behaves as a loosely coordinated unit. Research on periodical cicadas in North American forests found that calling at nearby sites was highly synchronized, with groups of males cycling their buzzing in phase with one another over distances of tens of meters.2PubMed Central. Self‐organizing cicada choruses respond to the local sound and light environment More distant groups, however, were largely independent, cycling at their own pace with no consistent phase relationship. The chorus is local, not global.
What this means for the listener is that silence can seem to ripple across a landscape. When one pocket of males pauses between calling bouts, the males within earshot of that pocket tend to pause too. The result is a wave of quiet that feels sudden and total if you happen to be standing inside one of those synchronized clusters. Step fifty meters away, and you might hear a completely different group still going strong. The chorus also responds to changes in light: passing shadows or abrupt shifts in ambient brightness can reset the group’s cycling, producing a momentary hush before calling resumes.
Mating Success Shuts Down the Call
The entire point of a male cicada’s call is to attract a female. Once that goal is achieved, the call changes or stops. In species where the male transitions from a long-range calling song to a quieter courtship song as a female approaches, the loud noise ceases the moment physical contact is made. At that point, the male stops singing altogether and proceeds to mount and copulate.3PubMed Central. Females prefer males producing a high-rate song with shorter timbal–stridulatory sound intervals in a cicada species
Even after mating is complete, the male does not simply pick up where he left off. Studies on cicada species that were observed over multiple mating events found that males who resumed calling after copulation did so at a significantly lower rate, with longer pauses between phrases. Their post-mating songs were measurably less attractive: none of the males observed calling again after mating managed to attract a second female.4PubMed Central. The best of both worlds: cicada males change costly signals to achieve mates while females choose a mate based on both calling and courtship songs Calling is metabolically expensive, and the energy cost of producing that first successful bout appears to leave the male with diminished reserves. As the mating season progresses and more males have mated at least once, the overall volume of the chorus drops not because conditions have changed but because fewer males are calling at full intensity.
Predator Alerts and the Startle Response
If you have ever walked toward a tree full of singing cicadas and noticed the noise cut out as you got close, you triggered their anti-predator response. Cicadas detect approaching threats through a combination of visual cues and substrate vibrations. A bird landing on a branch, a person crunching through leaf litter, or even the shadow of a passing raptor can silence a nearby group almost instantaneously.
This response is individual but contagious. One male goes quiet, and its immediate neighbors, suddenly hearing a gap in the chorus, tend to stop as well. The silence spreads outward from the disturbance site in what amounts to a chain reaction. Once the threat passes, calling resumes in a ragged, staggered fashion rather than all at once, which is why a cicada chorus that has been startled often sounds different for a minute or two afterward: thinner, less rhythmic, and building back up in fits and starts. This is distinct from the synchronized cycling described earlier, which is rhythmic and predictable. The predator-triggered silence is abrupt and asymmetric.
Some species take the approach a step further. Rather than simply going silent, they drop from their perch and fly erratically, producing a loud distress call that sounds nothing like the mating song. That alarm squawk can startle nearby males into flight as well, clearing a section of canopy of calling insects in seconds.
Fungal Parasites That Rewire Behavior
One of the more unsettling reasons a male cicada might stop calling normally involves a parasitic fungus called Massospora cicadina, which specifically targets periodical cicadas. The fungus colonizes the abdomen, eventually destroying the reproductive organs and replacing the rear segments of the body with a chalky mass of spores. Infected males do not just go silent; they switch to producing wing-flick signals that are normally used only by sexually receptive females. These signals attract other males, who attempt to mate with the infected individual, picking up spores in the process.5Nature. A specialized fungal parasite (Massospora cicadina) hijacks the sexual signals of periodical cicadas (Hemiptera: Cicadidae: Magicicada)
The effect on the chorus is subtle but real. Infected males are still active, still moving through the population, but they are no longer contributing their calling song to the collective noise. Instead, they are operating as silent lures, drawing healthy males into close contact. The fungus has essentially hijacked the cicada’s communication system, turning a caller into a trap. Researchers have found that this behavioral manipulation is limited to one stage of the infection: males producing the early, actively spreading conidiospores exhibit the fake female signals, while males at a later resting-spore stage do not.5Nature. A specialized fungal parasite (Massospora cicadina) hijacks the sexual signals of periodical cicadas (Hemiptera: Cicadidae: Magicicada) Massospora is one of several entomopathogenic fungi known to alter insect behavior, and it represents the most dramatic way a cicada can stop making its normal noise while still being alive and active.
Human-Made Noise and Acoustic Interference
Cicadas are not immune to having their own communication jammed. Researchers studying the grapevine cicada, a pest species in agricultural regions, found that broadcasting certain acoustic signals in the field interrupted male sexual signaling. When disruption signals were played near grapevines, males stopped calling, and females in the area laid fewer eggs on nearby branches.6Entomologia Experimentalis et Applicata. Disruption of reproductive behavior of grapevine cicada, Cicadatra alhageos, by acoustic signals playback The playback effectively broke the communication channel between males and females, silencing the chorus not through any natural cue but through acoustic interference.
This finding has practical implications for pest management, but it also raises questions about how urban and suburban noise might affect wild cicada populations. Constant background noise from traffic, construction, or machinery occupies some of the same frequency ranges that cicadas use to communicate. While cicada calls are famously loud, often exceeding 90 decibels at close range, a noisy environment can still mask the signal enough that males reduce or shift their calling. In heavily urbanized areas, some researchers have observed that cicada choruses are quieter, shorter in duration, or shifted to different times of day compared with populations in quieter rural settings. The science on long-term population effects is still thin, but the mechanism is clear: if a male cannot be heard, calling wastes energy, and natural selection favors males that adjust their timing or intensity.
The Daily and Seasonal Arc of Calling
Even when no specific trigger causes an abrupt silence, cicada noise follows a predictable daily and seasonal pattern that can make it seem like it stops suddenly. Most species concentrate their calling into specific windows of the day, often peaking between late morning and mid-afternoon when temperatures and light levels are highest. Some tropical and subtropical species call at dawn or dusk instead, filling a time slot that avoids competition with other species or takes advantage of calmer air that carries sound farther. Once their window closes, the silence can feel dramatic simply because the noise was so intense during the peak.
Seasonally, the trajectory is even more striking. Periodical cicadas, the famous North American species that emerge in synchronized broods on 13- or 17-year cycles, produce a chorus that lasts roughly four to six weeks. During that window, the noise builds over the first week or two as more adults emerge, molt, and mature enough to call. It peaks during the middle phase when mating activity is at its height. Then it drops off sharply as males die, females shift their energy to egg-laying, and the surviving adults age out of reproductive condition. The final few days of a periodical cicada emergence can feel eerily quiet compared to the peak, even though scattered individuals are still calling. Annual species, which emerge every summer in overlapping generations, create a more gradual seasonal arc, but even they have peak weeks and off weeks driven by weather patterns and population dynamics.
Why the Silence Feels So Sudden
Part of what makes cicada silence so noticeable is a quirk of human hearing. When a continuous loud noise is present, your auditory system partially adapts to it, mentally downgrading it to background. You stop actively hearing it. When the noise vanishes, the contrast is jarring, because your brain was not tracking the sound consciously until it disappeared. This is the same phenomenon that makes you notice a refrigerator hum only when the compressor clicks off. The cicada chorus is louder and more complex than a refrigerator, but the perceptual effect is the same: you register the absence more sharply than the presence.
There is also a spatial component. Because choruses are synchronized locally but independent over longer distances, a listener moving through a landscape can walk from one synchronized group’s territory into a gap between groups and experience near-total silence even though the overall population is still active. If the wind shifts and carries sound from a distant group, the noise seems to snap back on. The chorus is patchy, not uniform, and human movement through that patchwork creates the impression of sudden on-off switching that is really just geography.
When Silence Means Something Is Wrong
Not every quiet spell is benign. A cicada population that fails to produce a chorus at all during its expected season may be signaling a genuine ecological problem. Habitat loss is the most straightforward cause: cicada nymphs spend years underground feeding on root fluids, and if the trees they depend on are removed or the soil is compacted by development, the nymphs die before they ever emerge. Pesticide applications targeting other insects can also kill nymphs or newly emerged adults before they have a chance to call. In areas where periodical cicada broods have historically been dense, local extinctions of individual broods have been documented, sometimes tied to suburban expansion that paved over the forest floor those nymphs needed.
Climate shifts add another layer of uncertainty. If spring temperatures arrive earlier than a species’ emergence cues expect, nymphs may emerge before conditions are truly stable, leading to higher mortality from late frosts or mismatches with the plant resources they need. Conversely, if the warm season arrives late, the calling window may be compressed, making the chorus shorter and less intense than usual. Over long timescales, shifts in temperature zones could push some cicada species out of parts of their historical range entirely, replacing the familiar summer drone with silence that no amount of waiting will fill.
For periodical cicadas in particular, the stakes are high because their populations cannot recover quickly. A brood that is wiped out in a given area cannot be replaced for another 13 or 17 years, and if the habitat has changed enough in the interim, even the next generation may fail. Some entomologists have raised concerns that certain smaller broods are already in decline, their choruses thinner and patchier than historical records suggest they should be. Monitoring cicada noise, it turns out, is one of the simplest and most effective ways to track the health of these populations: when the sound disappears for good, the insects are already gone.