Stir together corn and buttermilk; let stand 30 minutes. Drain.
Combine flour and next 3 ingredients in a large zip-top freezer bag. Add corn to flour mixture, a small amount at a time, and shake bag to coat.
Pour oil to depth of 1 inch in a Dutch oven; heat to 375°. Fry corn, in small batches, in hot oil 2 minutes or until golden. Drain on paper towels. Serve immediately.