CarShield Field, formerly T.R. Hughes Ballpark, is a stadium in O'Fallon, Missouri. It is primarily used for baseball, and was the home field of the River City Rascals Frontier League baseball team, until the team folded and ceased operations at the end of the 2019 season. Beginning in 2020, it became the home field for the O'Fallon Hoots of the Prospect League.