Nevada was No. 25 in the poll released Sunday and is off to a 4-0 start for the first time since 1991, the year before it jumped from Division I-AA competition to the top level.
"It's very exciting news," Nevada coach Chris Ault said. "I'm sure our players will be fired up."
Nevada was last ranked during the 1948 season.
Nevada Ranked For First Time Since 1948