If you want to discourage or deter squirrels -- whatever the reason -- try making food inaccessible, providing food not favored by squirrels, or providing food specifically for squirrels.

Quick Note

Animal scents, sound emitters, and other devices aren't very effective for very long.

Inaccessible Food

Prevent squirrels from accessing food by

1. Using squirrel-deterring feeders with cages, baffles, or other elements
2. Placing the feeder away from squirrel jump-points
3. Protecting bulbs and other plants
4. Removing other food sources like dog food

Feeders By Placement

For all other feeders, the feeder must be at least five feet from the ground and other tree limbs, decks, or balconies to prevent squirrels jumping onto the feeder.

Also, try to avoid placing feeders near windowsills or doorways.

Plants

For plants favored by squirrels -- bulbs or vegetation -- try wire mesh or metal cages. Simple bird netting can work as well, although not as affectively. Or, try spreading powder deterrent like Shake Away on the soil's surface.

Distasteful Food

Discourage squirrels by providing food they, hopefully, will find distasteful.

• Thistle seed seems to be less preferred by squirrels than most other wild birdseed. They will still eat it, but it won't be gobbled like other birdseed.
• Squirrel Away, a concentrate repellent powder made from the spicy part of hot peppers, or other similar products may discourage squirrels and will not harm birds.