Arkansas will play Southern Cal at Baum Stadium next season on March 2-4. The Razorbacks will play in Los Angeles on Feb. 22-24, 2019.
Here is some more information on schedules for those seasons:
In addition to USC, Arkansas is scheduled to host Texas for two games, Texas Tech for one or two games and Kent State for a weekend series. The Razorbacks will travel to Oklahoma State during the midweek for one game and play at Charlotte for two games. Arkansas also is scheduled to play in the Tony Gwynn Classic at Petco Park in San Diego.
Oklahoma State, Charlotte and Louisiana Tech come to Baum Stadium for return games, and Arkansas hosts Stony Brook for a weekend series. In addition to USC, the Razorbacks will travel to Texas on spring break for two games.
I should add that several of those 2018-19 games have not been finalized.