The following year, Georgia rehired Warner and the team had an undefeated season. While at Georgia, Warner also served as a co-coach at Iowa State. He coached teams from two schools simultaneously on three occasions: Iowa State and Georgia during the 1895 and 1896 seasons, Iowa State and Cornell in 1897 and 1898, and Iowa State and Carlisle in 1899. Warner's Iowa State record was 18–8, bringing Warner's total lifetime record to 337–114–32. Warner brought many innovative playing mechanics to college football: Warner died of throat cancer in Palo Alto, California at the age of 83.