Periodical Cicada Emergence — Eastern USA
The periodical cicada (Magicicada septendecim and related species) Brood X emergence in the eastern United States — 1.5 trillion insects emerging simultaneously after 17 years underground, the males' combined mating calls exceeding 100 decibels (louder than a chainsaw at 1 metre), the exoskeletons carpeting every tree trunk and sidewalk, and the sky above the forests visibly filled with flying insects — is the most astonishing mass-emergence event in the natural world. The emergence occurs every 17 years in specific broods (Brood X last emerged in 2021, next 2038; Brood XIII in 2024), the synchrony maintained by a biological clock mechanism still not completely understood. The cicadas' 4–6 week adult lifespan (entirely devoted to mating and egg-laying before death), the complete indifference to humans (the emergence predates human presence and includes no predator avoidance behaviour toward large mammals), and the weight of exoskeletons underfoot create an encounter with biological time scales completely outside ordinary human experience.
About this spectacle
Standing in Rock Creek Park during a Brood X emergence means being surrounded by a living storm of insects — cicadas landing on arms, shoulders, and camera lenses with complete indifference. The sound is the first thing visitors describe: a collective mating chorus that exceeds 100 decibels, a mechanical, pulsing roar that physically vibrates in the chest and makes conversation difficult. Every tree trunk is tiled with shed exoskeletons, crunchy and amber-coloured, stacked three layers deep. Look up and the canopy is visibly alive, thousands of orange-winged insects threading between branches. Underfoot, the sidewalks are carpeted in both living insects and discarded shells. The smell of decay accumulates as the 4–6 week emergence progresses and adults begin to die en masse. Nothing in ordinary nature-watching prepares you for the sheer density — 1.5 trillion individuals emerging simultaneously, with no fear of humans whatsoever. A cicada will simply walk across your hand, rest on your ear, and continue about its 17-year-culminating business as though you are furniture.
When to go
Jan — Dec, peak May — Jun
Getting there
Nearest airport: DCA. Nearest city: Washington, D.C..
Booking options
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