Turn in your worn-out tires as soon as you replace them.
Nowadays, most tire stores and services centers will take your old tires off your hands when you buy new ones, making it an easy recycling habit for you. They know how to dispose of them properly. But some places do charge a fee. Some municipalities across the county accept used tires as well, for a small charge, but they may only accept certain sizes. Be sure to call ahead before you make a drop.