Squirrel nest-building activity is most noticeable between around June to July. That's when mother squirrels are teaching their spring-born young how to build nests. But actually, there are much busier periods of a squirrels day. The real squirrel nest construction boom happens during the fall.

Do squirrels come back to the same nest?

Squirrels are creatures of habit and are not as selective as other warm-blooded mammals in the rodent family. Squirrels usually have no problems returning to previous nests they have built and reuse them.

Where do squirrels nest in winter?

Instead of hibernating, they rely on sheltered nests or dens in trees, fat reserves, and stored food to survive the long, cold winter. You may have noticed these huge impressive nests when you look high up into trees this time of year. With the leaves off the trees, these nests are visible right now.