The aircraft experienced a runway excursion upon landing at Lake County Airport (LXV/KLXV), Leadville, Colorado. The pilot reported that, while conducting a night landing on a runway contaminated with ice and patchy packed snow, the airplane overshot the touchdown zone. The pilot tried to fly the airplane onto the runway to avoid floating. The airplane touched down firm and the pilot applied moderate braking, but the airplane did not decelerate normally. The airplane went off the end of the runway and collided with several Runway End Identifier Lights (REILs) and a tree. The airplane sustained substantial damage to the left and right wings. Probable Cause and Findings: The pilot’s failure to maintain proper control of the airplane, which led to an unstabilized approach and a long landing on a runway contaminated with ice and patchy packed snow resulting in a runway excursion.