Saved by the Bell

  • Below you'll find the various bell schedules observed at Centennial High School during the school year. Schedules are subject to change per administration.

    For your convenience, we will also post fall and spring exam schedules as well as special schedules used for testing such as the PSAT, the fall senior ACT retake, the spring junior ACT, Williamson County testing, and state testing.

Standard Schedule

  • Mid-Day Activity/Pep Rally Schedule

  • Activity/Pep Rally at End of Day

  • Half Days

  • Two-Hour Delays

  • Exams and Special Testing

A school desk bell on a white background.

Late Start Dates

Late Start Schedule
  • Late Start Days involve a 45-minute late start one day per week (with the exception of certain holiday and testing weeks, as noted in the schedule). Per school board requirement, Centennial adds seven extra minutes each day to implement the late start schedule. 


    Williamson County Late Start Days