Nuts still in their shells! In particular, a variety of walnuts, hickory nuts, white oak acorns, beechnuts make for a great squirrel diet. ... It's definitely better to have them gnawing a nut shell rather than your house!

Are walnuts poisonous to squirrels?

Toxic foods are poisonous to squirrels and should be completely avoided. Unhealthy foods won't necessarily cause lasting harm to squirrels but should still be limited. Healty nuts include: acorns, pumpkin seeds, almonds, hazelnuts, macadamia nuts, walnuts, pecans, pistachios, and peanuts (unsalted).

What nuts can squirrels not eat?

Nuts/Seeds—Two per day, preferably in the shell. Acorns, whole roasted pumpkin seeds, and almonds are the healthiest, followed by hazelnuts, macadamia nuts, English walnuts, pecans, pistachios, and peanuts, in that order. Avoid: Cashews, sunflower seeds, dried corn, pine nuts (will cause severe calcium loss).