Toby Keith and Trace Adkins will tour together this summer on what is billed as the Toby Keith America's Toughest tour. The series of concerts will begin June 18 in Holmdel, N.J. No other specific dates have been announced, but tour stops are planned in the following cities: Boston; Buffalo, N.Y.; Charlotte, N.C.; Chicago; Cincinnati; Cleveland; Dallas; Hartford, Conn.; Indianapolis; Philadelphia; Pittsburgh; Raleigh, N.C.; St. Louis; Salt Lake City; Tampa, Fla.; Virginia Beach, Va.; Washington, D.C.; and West Palm Beach, Fla.