We have a bear-proof birdfeeding station, a product of more than a decade of trying to feed the birds but not the bears. You can see the metal pole that is sunk in concrete in the photos below. Atop the metal pole, three branches extend out horizontally, each holding a bird feeder. This system has stymied bears for about 6 years.
Every May and June, a few young males pass through to check out the system and leave with nothing. They don't come back, and we usually get no ursine visits after July. Our recent visitor entered our clearing in the middle of a thunderstorm and torrential rain. He attacked our bear-proof garbage cans after failing with the birdfeeders. He rolled one garbage can into the woods to work on it in privacy but didn't get it open.
Here's his visit chronicled by my wildlife cameras.