Signs Your Home Is Invaded by 17-Year Periodical Cicadas

Every 17 years, one of nature’s most fascinating phenomena occurs: the emergence of 17-year periodical cicadas. These insects, belonging to the genus Magicicada, spend nearly two decades underground before bursting forth in enormous numbers to mate and lay eggs. While cicadas are generally harmless and do not bite or sting, their overwhelming presence can be unsettling and occasionally problematic for homeowners. If you live in an area where these cicadas are expected or if you suspect your home is being invaded by them, it’s crucial to recognize the signs early on.

In this article, we’ll explore the telltale signs that your home has been invaded by 17-year periodical cicadas and offer insights on how to manage their presence effectively.

What Are 17-Year Periodical Cicadas?

Before diving into the signs of invasion, it’s helpful to understand what makes these cicadas so unique:

• Life Cycle: These cicadas spend most of their lives underground as nymphs, feeding on root sap for 17 years.
• Emergence: After 17 years, they emerge simultaneously in massive numbers.
• Appearance: Adults have red eyes, orange-veined wings, and black bodies.
• Sound: Males produce loud mating calls that can reach up to 100 decibels.
• Behavior: They swarm trees and shrubs to mate and lay eggs.

Because of their synchronized emergence, the sheer volume of cicadas can cause noticeable disruptions in the environment around your home.

Common Signs Your Home Is Invaded by 17-Year Periodical Cicadas

1. Loud, Persistent Drone Near and Inside Your Home

One of the most obvious signs of a cicada invasion is hearing their distinct sound — a high-pitched, continuous buzzing or trilling noise produced mostly by male cicadas to attract females. When thousands or even millions emerge together, the cacophony can be deafening.

• Outside: You’ll hear a chorus of cicada calls coming from trees and shrubs surrounding your property.
• Inside: If windows or doors are open or not properly sealed, the sound may penetrate indoors.

This loud noise often starts during daylight hours and can last throughout the warm part of the day for several weeks.

2. Visible Cicada Bodies on Walls, Windows, and Screens

After emerging from underground, cicadas often climb vertical surfaces such as walls or tree trunks to molt from nymphs into adults. This molting process leaves behind empty exoskeletons, which you might find stuck on:

• Exterior home walls
• Window screens
• Door frames

Additionally, dead or dying cicadas may accumulate near entry points or beneath outdoor lights where they congregate at night.

3. Large Numbers Hovering Around Trees and Shrubs Close to Your Home

Since cicadas rely on trees for mating and egg-laying, their presence is most apparent near wooded areas or ornamental trees planted near your home. Signs include:

• Clusters of adult cicadas on branches and leaves
• Brown scars or slits on small twigs caused by females laying eggs (called oviposition)
• A sudden increase in falling dead branches due to twig dieback

If you notice an unusual number of insects hovering around your yard’s vegetation, it could indicate a nearby emergence site.

4. Molted Exoskeletons Clinging to Trees and Outdoor Surfaces

Shed exoskeletons are a very distinctive marker of periodical cicada activity. These tiny golden-brown shells look like miniature insect suits clinging stubbornly to bark, fences, porch railings, or even outdoor furniture.

Molting usually takes place during late morning or early afternoon after the nocturnal emergence from soil burrows. Finding many of these shells around your property means a large emergence event has recently occurred.

5. Increased Number of Dead Cicadas Around Your Property

Although adult cicadas only live for about four to six weeks above ground, they don’t all survive this period. Many die naturally after mating or egg-laying. This leads to:

• Piles of dead cicada bodies on porches
• Accumulations near drainage areas
• Dead insects clogging gutters or window sills

The presence of numerous dead bodies is another sign that your property has been heavily visited by these insects.

6. Egg-Laying Damage on Young Tree Branches and Shrubs

Female periodical cicadas lay eggs in slits cut into small twigs. This causes characteristic damage such as:

• Small “V” shaped cuts along branches
• Wilted or browning tips where eggs were laid (referred to as “flagging”)

If you observe twig dieback or damaged new growth on trees close to your home — especially dogwoods, maples, oaks, or fruit trees — it may be linked to cicada oviposition activity.

7. Presence of Nymph Exit Holes in Soil Near Foundation Plants

If you detect small round holes about half an inch wide clustered near plants around your foundation or garden beds, these could be the exit tunnels where nymphs emerged from underground.

Cicada nymphs dig upward through soil to reach the surface just before molting into adults. Finding these holes en masse signals an ongoing emergence beneath your property.

How Do Cicadas Enter Homes?

While adult periodical cicadas do not intentionally invade homes like some pests do, they can inadvertently enter through:

• Open doors and windows
• Cracks in screens or poorly sealed openings
• Gaps around attic vents or eaves

Once inside, they tend to rest temporarily before finding their way out again. Unlike other insects such as ants or termites, cicadas do not infest furniture or damage structures internally.

Potential Problems Caused by Cicada Invasions

Though harmless to humans in terms of bites or stings, massive cicada invasions can lead to some issues:

• Noise disturbance: The loud calls can disrupt sleep or outdoor activities.
• Physical mess: Accumulation of dead bodies can create unpleasant odors and require cleanup.
• Plant damage: Repeated egg-laying can stress young trees causing branch dieback.
• Attraction of predators: Birds and small mammals attracted by abundant prey might increase around your home.

Understanding these challenges helps prepare you for managing an infestation if it occurs.

Tips for Managing Cicada Presence Around Your Home

While you cannot prevent a natural emergence event entirely — since it’s predetermined by nature — here are some strategies to reduce impact:

Seal Entry Points

Ensure all windows have intact screens with no holes and doors fit tightly with weatherstripping. Close windows during peak emergence periods if possible.

Protect Young Trees and Shrubs

Cover vulnerable plants with lightweight netting during peak egg-laying times (usually late spring) to prevent branch damage.

Remove Dead Insects Regularly

Clean up accumulated dead bodies daily to minimize odor issues and discourage secondary pests such as ants.

Use Outdoor Fans

Cicadas are weak fliers; strategically placed fans on patios may keep them away from seating areas.

Avoid Excessive Outdoor Lighting at Night

Bright lights attract many insects including cicadas; reducing outdoor lighting can help decrease nighttime gatherings near your home.

Conclusion

The arrival of 17-year periodical cicadas is a rare but spectacular natural event that brings thousands—sometimes millions—of these insects into neighborhoods across certain parts of North America. Recognizing the signs that these insects have invaded your home environment is key to managing their presence effectively without undue alarm.

From loud buzzing noises and visible molted shells to damaged tree branches and exit holes in soil around your garden beds—each indicator gives clues about the scale of the emergence near your property. With proper preparation and some proactive steps like sealing entry points and protecting young plants, you can minimize inconvenience while appreciating one of nature’s extraordinary cycles.

Remember: periodical cicadas emerge only once every seventeen years—and then disappear just as mysteriously—so their invasion is temporary but unforgettable!