Quick Answer
Squirrels in the attic announce themselves in the daytime — that's the first clue that separates them from rats. You'll hear running, scrambling, and gnawing at roofline level, usually in the early morning and again near dusk. Squirrels come in through gaps at the roofline — chewed soffits, gable vents, or where a branch touches the roof. They're active year-round, but September and October are when they start looking for a warm den before the first cold snap.
Why September and October Are Squirrel-Attic Season
I've been pulling squirrels out of attics around Austin for fifteen years, and I can set my calendar by the pattern. Through the summer an attic is too hot for a squirrel to care about. Then in late September the nights cool off, the acorns drop, and the same squirrels that spent all summer in the trees start testing your roofline for a way in.
It's not one thing that pushes them in. It's the combination of cooler nights and the hardwired urge to store food for winter. A squirrel that gets in once this fall will keep coming back, and by late October you can have a second generation using the same hole.
If you're not sure whether the noise is squirrels or something else, my squirrel vs rat in the attic identification guide walks through the differences in sound, droppings, and damage.
Day vs Night: The Quick Way to Tell What's Up There
The single most useful thing I tell homeowners is to note the time of day. It narrows the animal down before you ever climb a ladder.
| When You Hear It | What It Sounds Like | Most Likely Animal |
|---|---|---|
| Daytime (esp. early morning / dusk) | Fast running, scrambling, gnawing at roofline | Squirrel |
| Night, heavy | Thumping, dragging, occasional hissing or chattering | Raccoon |
| Night, light | Tiny scurrying, quick and skittering | Rat or mouse |
For a deeper listen, see what's scratching in the attic at night — most people assume it's raccoons when it's actually rats.
The Sounds a Squirrel Actually Makes
A squirrel sounds busy. You hear short bursts of running, a scramble, then a pause. When they chew, you hear a rhythmic gnawing that comes and goes. Sometimes in the evening they'll make a quick bark or chatter from inside the walls, which freaks people out the first time they hear it.
There's one sound that trips up a lot of homeowners: the thump. Squirrels jump between rafters and land with a solid thud, which sounds a lot heavier than the animal actually is. If you're hearing that thump in the daytime, it's almost certainly a squirrel — raccoons are night animals.
If you're also finding chewed wires, this guide to what animal is chewing wires in the attic covers why squirrels and rats both do it, and why it's a fire risk worth taking seriously.
Signs It's a Squirrel (Not Just a Sound)
Sounds tell you something's up there; the signs tell you what. Here's what I look for on a squirrel job:
- Droppings — small and oblong, roughly a third of an inch long, often piled near the entry or along a rafter. Rat droppings are bigger and more capsule-shaped.
- Nesting material — squirrels drag in dry leaves, shredded paper, and insulation, and they'll hollow out a nest that looks like a messy ball.
- Chew marks — rough-edged, fresh-looking damage on soffit corners, fascia boards, and vent screens.
- A worn entry — a gap at the roofline with dark smudges or flattened edges from coming and going.
For the full list of silent clues, see the silent signs of a rodent infestation — the checklist catches the ones you'd never hear.
Where Squirrels Get In (It's Almost Always the Roofline)
Squirrels are climbers, so they don't bother with ground-level gaps the way rats do. In my experience the entry is one of four places:
- Chewed or lifted gable and roof vents with torn screens
- Soffit seams that have pulled apart or been chewed open
- The gap where the roof meets the fascia, especially at corners
- Where a branch or vine touches the roof — they use it as a ramp
They'll also walk a power line or downspout to reach the roofline. Trim any branch within about six to eight feet of the roof, and you cut off most of their access.
The First Rule: Confirm the Attic Is Empty
Before you seal anything, make sure nothing is still inside. Sealing a squirrel — or worse, a mother with babies — in the attic is the worst possible outcome. I always tell homeowners to:
- Listen at dawn and dusk for a few days to map activity
- Look for a nest with young before blocking an entry
- Use a one-way door if there's any chance something is still coming and going
If the attic is already active with babies, this is the point where I'd hand it to a pro rather than try to rush it. And if you'd rather not do any of it yourself, the rodent exclusion cost guide lays out what professional sealing typically runs.
Squirrel-Proofing Your Attic This Fall (DIY)
Most of the fall-proofing is simple, and you can do it over a weekend:
- Trim branches back to at least six feet from the roof
- Cover roof and gable vents with 1/4-inch hardware cloth — it's the material that actually stops squirrels
- Pack small gaps with steel wool and seal with caulk (rodents can't chew steel wool)
- Repair chewed soffit corners with metal flashing screwed in place
- Cap the chimney if it doesn't have one
One warning: expanding foam alone won't hold a squirrel. They chew through it in a night. Use it as a filler, but back it with wire or steel wool. For the full house walkthrough, see how to animal-proof your home this fall.
When to Call a Pro
Some jobs are worth hiring out: anything that puts you on the roof edge, any attic with an active nest of babies, any sign of chewed wiring (fire risk), and anything involving bats — which are protected in many states and need specialized handling.
FAQ: Squirrels in the Attic
Do squirrels live in attics year-round?
Usually not. Most squirrels use an attic as a seasonal den — fall and winter especially — though a female may raise young inside too. If the attic is cool in summer or the squirrel finds food, it may stay longer.
What time of day do squirrels make noise in the attic?
Daytime, mostly early morning and again near dusk. Squirrels are diurnal. If the noise is at night, it's more likely a rat, mouse, or raccoon.
Will squirrels leave on their own?
Once they've found a warm den and a food supply, usually not. They'll keep coming back to the same entry. Sealing the entry (after confirming it's empty) is what actually ends it.
Can a squirrel chew through the ceiling?
Not through the drywall quickly, but they can chew wiring, ducts, and framing. Chewed wires are a real fire hazard, which is why an active squirrel attic shouldn't be left for months.
Are squirrels in the attic dangerous?
Rarely aggressive, but their chewing is the risk — wiring, insulation, and vents. Their droppings and nesting can also trigger allergies. The main danger is fire from damaged wiring.
Sources: NPMA, CDC, Texas A&M AgriLife Extension, US Fish and Wildlife Service, state wildlife agencies. This guide is for informational purposes only and does not constitute professional wildlife management advice.