The Food City 500 was originally set for a green flag at 2:13 p.m. ET. That start time -- and all pre-race ceremonies -- have been moved up to one hour earlier.
Officials reached that decision Saturday morning, faced with an 90 percent chance of precipitation in the race-day forecast at the half-mile Tennessee track, according to the National Weather Service.
Kyle Busch will start on the pole for the race while brother Kurt will start next to him on the front row.