The River City Rascals have been in O'Fallon, MO since 1999 playing at T.R. Hughes Ballpark. The Rascals are members of the Frontier League, an independent minor league baseball, that offers players an opportunity to continue to learn to be a professional baseball player and move to affiliated professional baseball. There have been several player that have moved on to Major League Baseball. The River City Rascals offer affordable family friendly fun and entertainment to the St. Charles County area.

River City Rascals will host the Missouri State High School League Baseball State Championships starting 2012-2013 until 2015-2016