One great way to handle squirrels in your garden is to set up a squirrel feeder in a different location. Squirrels will be looking for food no matter what you do so providing them with their own acceptable source of nutrition should help to keep them away from your fruits and vegetables. If you make this food more easily accessible than your garden they will typically choose to eat it instead.

Another simple way to keep squirrels away from your yard, in general, is to get a dog. Not only are dogs great pets, but they serve functional purposes as well. Breeds like Jack Russell Terriers have been bred to manage small-game like rabbits and squirrels for thousands of years. Once they realize that your yard is no longer safe to them because of the dog they will be more likely to steer clear of your garden.
One of the most effective ways of keeping any kind of animal out of your garden is to be incredibly clean and tidy. Look for seeds and crops that are just lying on the ground. If you are prudent and consistent with cleaning these up and throwing them away you will definitely see fewer squirrels hanging around your property to eat.
Finally, if none of these options is having a tangible effect on your squirrel problems you may wish to seek out different forms of repellents. If you do a search online or browse your local hardware store you are likely to find products labelled as squirrel repellents. These chemical repellents use scents as a virtual barrier to dissuade squirrels from coming onto your property. They do not last a very long time and can cause issues with other plant and animal life.
If it makes sense for your garden you may even want to consider using netting or fabric to cover your plants and create an exclusion barrier for squirrels. It is a bit disappointing if you like to look out at your garden, but it will provide a level of protection from most outdoor pests.