The most telling sign of a raccoon in your attic is heavy thumping or walking sounds at night. Adult raccoons weigh 10 to 30 pounds, so their movement across joists sounds more like a person walking overhead than the light scratching of a mouse or squirrel. If those nighttime sounds are paired with damage to your roofline, droppings that look like small dog waste, or a musky smell you can’t explain, you’re almost certainly dealing with a raccoon.
Sounds That Point to Raccoons
Raccoons are nocturnal. The noises start between dusk and dawn and include heavy thumping, dragging, and rustling as the animal moves through insulation and along framing. Even when a raccoon isn’t vocalizing, its sheer size makes it impossible to miss. You may also hear vocal sounds: growling, chittering, hissing, or a distinctive churring purr. Raccoons use over 200 different vocalizations, so the range can be surprising.
If baby raccoons (kits) are present, you’ll hear high-pitched chirping, mewing, or crying that can sound remarkably like birds. Kits cry persistently when hungry or when the mother is out foraging, sometimes for hours at a stretch. That constant whining from a fixed spot in the attic is one of the strongest indicators that a raccoon has not just visited but is actively nesting.
How to Tell It’s Not a Squirrel
Squirrels are active during the day. Rapid, light scratching that starts at sunrise and quiets by sunset is the classic squirrel pattern. Their footprints are only 1 to 2 inches long, and they weigh a fraction of what a raccoon does. Flying squirrels are nocturnal, but at 2 to 5 ounces they produce faint sounds closer to mice than to the heavy thumps of a raccoon. If the noise at night is loud enough to wake you, a squirrel is unlikely.
Droppings and Latrines
Raccoons don’t scatter droppings randomly. They establish communal latrines, returning to the same flat spot to deposit fresh feces on top of old feces over and over. In an attic, this latrine is typically on a flat section of subflooring or near a corner. You’ll find a concentrated pile of droppings in various stages of decomposition rather than waste scattered across the entire space.
Fresh raccoon droppings are tubular with blunt ends, dark in color, and roughly the diameter of a nickel or dime. They’re 2 to 3 inches long, similar in size to small dog droppings. You may see seeds or nut shells embedded in them. As droppings age, they dry out and can look like clumped leaves or debris, making older latrines easy to overlook. Squirrel droppings, by contrast, are only about 3/8 inch long and scattered throughout the attic rather than concentrated in one spot.
Damage to the Roof and Entry Points
Raccoons don’t slip through existing gaps the way mice do. They create their own entrances. Look for torn shingles, ripped soffit panels, damaged fascia boards, and displaced roof vents. An opening as small as 4 inches is enough for a raccoon to squeeze through, and they’ll enlarge any weak spot with their strong, dexterous front paws. The entry hole often has ragged, torn edges rather than the clean gnaw marks left by rodents.
Raccoons also leave greasy rub marks along surfaces they travel repeatedly. Dark smudges on soffits, fascia boards, and the edges of roof vents are a reliable indicator. Their paw prints show five toes on both front and hind feet and measure roughly 3 to 4 inches long, the largest prints you’ll find from common attic wildlife. After rain or on dusty surfaces near the roofline, these tracks can confirm what’s getting in.
Insulation and Interior Damage
Inside the attic, raccoons tear insulation into nesting mounds. They pull fiberglass batts from between joists, shred vapor barriers, and rip into ductwork as they widen pathways or build a den. The damage tends to be concentrated around the nesting area rather than spread evenly, which is another contrast with squirrels, whose gnawing and shredding is more widespread. Raccoons also compress insulation simply by walking on it, reducing its effectiveness across large sections of your attic floor.
Smell
A raccoon latrine produces a strong, unmistakable odor, especially in a warm, enclosed attic. Urine soaks into insulation and wood, and the smell intensifies over time. If you notice a persistent musky or ammonia-like odor coming from your ceiling or attic access point, a raccoon latrine is a likely cause. The smell alone sometimes prompts homeowners to investigate before they ever hear a sound.
When Raccoons Are Most Likely Nesting
Raccoon breeding season runs from January through March, with kits born in April and May. Late or second litters can arrive in late summer or early fall. The average litter is three to five kits, though litters tend to be larger in urban areas where food is plentiful. If you notice new attic activity in late winter or early spring, there’s a good chance a female raccoon is looking for a safe, warm den to give birth. Kits stay in the nest for weeks before they’re mobile enough to follow their mother outside.
Health Risks From Raccoon Latrines
Raccoon droppings carry a parasitic roundworm called Baylisascaris that can cause serious illness in humans. A high percentage of raccoons are infected. The worms produce millions of eggs shed in feces, and after two to four weeks in the environment, those eggs become infectious. Under the right conditions, they can survive in soil for years.
Humans become infected by accidentally swallowing the eggs, whether from contaminated hands, dust, or objects. Once inside the body, larvae migrate through the liver, brain, spinal cord, or eyes. Symptoms typically appear one to four weeks after exposure and can include nausea, fatigue, loss of coordination, vision problems, seizures, and in severe cases, the infection can be fatal. Young children are at the highest risk because of hand-to-mouth behavior. No medication is fully effective once infection takes hold, which is why avoiding contact with raccoon feces is critical.
Do not sweep, vacuum, or disturb a raccoon latrine without proper protection. Sweeping and vacuuming can send microscopic eggs airborne. If you find a latrine in your attic, wearing a respirator and disposable gloves is the minimum precaution. For large or long-established latrines, professional cleanup is the safer route. Contaminated insulation typically needs to be removed entirely.
Getting Raccoons Out Safely
The standard approach is a one-way exclusion door installed over the raccoon’s entry point. The device lets raccoons exit the attic freely but prevents them from getting back in. Once installed, the process typically takes a few days. After activity stops, you inspect the rest of the roofline (soffits, vents, pipes, and any weak spots) to confirm no new holes have been opened, then remove the door and permanently repair the entry point. Raccoons will return and test the old entrance, so repairs need to be solid. Galvanized steel mesh over the damaged area before patching is a common reinforcement.
There’s one important exception: baby season. If kits are present, a one-way door will trap them inside. Young raccoons can’t exit the den until they’re fully mobile, which takes several weeks. Installing an exclusion door while kits are in the attic means the mother gets locked out and the babies starve. If you hear persistent crying or chirping from a fixed location, either the kits need to be physically removed and reunited with the mother outside, or you need to wait until they’re old enough to follow her out on their own before installing the door.
After the raccoons are gone, sealing every potential entry point is essential. Raccoons are strong, persistent, and have excellent memory. Torn soffits, loose vent covers, and gaps along the roofline all need to be repaired with materials sturdy enough to resist their prying. Thin aluminum or plastic screening won’t hold. Steel mesh, heavy-gauge hardware cloth, and solid wood or metal patches are the standard materials for lasting exclusion.