At approximately 13:30 mountain time, a Cessna T206H was damaged during landing at Front Range Airport. The pilot was not injured. The pilot was en route IFR from Tea, S.D., to Centennial Airport in Englewood, Colo., when he encountered icing conditions. He requested various altitudes in an attempt to get out of the icing, but was unable to maintain altitude and diverted to Front Range. The airplane landed hard, departed the runway and struck a taxiway sign.