The pilot stated he departed Lafayette, Tennessee, flying visual flight rules to a private airstrip in Westmoreland, Tennessee. Upon arrival at Westmoreland, he entered right traffic to runway 19. The runway was covered with snow and snow drifts. He completed the before landing checks and landed on the runway. During landing roll out, he failed to maintain a visual look out and the left main landing gear collided with a snow drift. The airplane nosed over and came to rest inverted, resulting in structural damage to the left wing and vertical stabilizer. The pilot and one passenger exited the airplane unassisted and without injury. The pilot stated there were no mechanical problems with the airplane.