Squirrels in the Attic: Ottawa's Spring Nesting Problem

Squirrel activity in Ottawa attics rises sharply every spring, driven by the same instinct that draws raccoons indoors: the search for a safe, sheltered place to raise young. Squirrels are smaller and generally less destructive than raccoons, but an active nest still causes real damage and needs a different removal approach than other attic wildlife.

Why Spring Is Peak Squirrel Season in Ottawa

Eastern grey squirrels, the species most common in Ottawa, typically have two breeding periods each year — one in late winter leading to spring births, and a second in mid-summer. Pregnant females actively seek enclosed, elevated spaces to nest, and a home's attic checks every box: dry, warm, predator-free, and close to the tree canopy many Ottawa neighbourhoods have in abundance.

How to Tell It's Squirrels and Not Something Larger

Squirrel movement is lighter and faster than raccoon activity, often described as quick scurrying or scratching, most noticeable during the day since squirrels are active in daylight hours, unlike nocturnal raccoons. Sounds concentrated in early morning and late afternoon, when squirrels are most active, are a strong indicator.

How They're Getting In

Squirrels are strong chewers and can widen even a small existing gap into a full entry point within days. Common access spots on Ottawa homes include roof edges where flashing has lifted, gaps where utility lines enter the attic, and damaged soffit vents. A single squirrel can create a surprisingly large hole compared to its size.

Why Timing Matters for Removal

If a female has already given birth in the attic, young squirrels are entirely dependent on her for several weeks before they're mobile enough to leave on their own. Removal attempted too early risks separating a mother from her litter, which is both inhumane and likely to leave young squirrels trapped inside unable to be reached.

What Squirrel-Proofing Actually Requires

Because squirrels are persistent chewers, sealing materials need to be more robust than what stops smaller pests — galvanized steel mesh and metal flashing repairs hold up where wood or plastic patches typically fail within weeks. A full exterior inspection to catch every point of entry, not just the obvious one, is what actually prevents a repeat problem the following spring.

Frequently Asked Questions