Here’s an answer for myself.

These are the spring practice dates for USC’s opponents.

Virginia March 21-April 12
Ohio State March 24-April 19
Notre Dame March 26-April 19
Arizona March 8-April 12
Arizona State March 25-April 19
Cal March 17-April 19
Oregon April 2-April 26
Oregon March 31-May 3
Stanford Feb. 26-April 12
UCLA April 3-April 26
Washington April 3-April 26
Washington State March 17-April 12