Saved by the Bell
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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.

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Pep Rally/Activity Schedule
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Standard
Regular School Hours: 7:40 AM – 2:47 PM
1st Period 7:40-8:29
2nd Period 8:34-9:22
Break 9:22-9:30
3rd Period 9:30-10:18
4th Period 10:23-11:115th Period 11:16-12:06
1 Lunch/1 HR 11:16-11:41
2 Lunch/2 HR 11:41-12:066th Period 12:11-1:01
3 Lunch/3HR 12:11-12:36
4 Lunch/4HR 12:36-1:017th Period 1:06-1:54
8th Period 1:59-2:47 -
Late Start Days
Late Start Day Hours 8:25 AM – 2:47 PM
Teacher Meetings 7:40-8:20
1st Period 8:25-9:07
2nd Period 9:12-9:53
3rd Period 9:58-10:39
4th Period 10:44-11:255th Period 11:30-12:20
1 Lunch/1 HR 11:30-11:55
2 Lunch/2HR 11:55-12:20
6th Period 12:25-1:15
3 Lunch/3 HR 12:25-12:50
4 Lunch/4 HR 12:50-1:157th Period 1:20-2:01
8th Period 2:06-2:47The Power of Mondays at Centennial
Centennial High School observes Power Mondays on most Mondays. When the school operates on this schedule, students report approximately 45 minutes later than the usual start time. During this time, faculty and staff participate in curriculum clusters to discuss course objectives, common assessment of student learning, and other professional development.
School buses will operate on their regular schedule on Power Mondays. Students who arrive at the regular start time have the opportunity to choose from several activities until classes begin.
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Half Days
Half Day of School Hours 7:40 AM – 11:15 AM
*If there are changes to this schedule for the 2020-2021 school year, we will post them.
Homeroom 7:40 AM – 7:50 AM
1st Period 7:55 AM- 8:19 AM
2nd Period 8:24 AM- 8:48 AM
3rd Period 8:53 AM – 9:17 AM
4th Period 9:22 AM – 9:46 AM
6th Period 9:51 AM- 10:15 AM
7th Period 10:20 AM – 10:44 AM
8th Period 10:49 AM- 11:15 AM -
Two-Hour Delays
Two-Hour Delay Hours 9:40 AM – 1:33 PM
*If there are changes to this schedule for the 2020-2021 school year, we will post them.
1st Period 9:40 AM – 10:15 AM
2nd Period 10:20 AM – 10:52 AM
3rd Period 10:57 AM – 11:29 AM
Lunch 11:29 AM – 12:19 PM
4th Period 12:24 PM – 12:56 PM
6th Period 1:01 PM – 1:33 PM
7th Period 1:38 PM – 2:10 PM
8th Period 2:15 PM – 2:47 PM -
Activity/Pep Rally Schedule
Activity/Pep Rally Day Hours 7:40 AM – 2:47 PM
1st Period 7:40-8:22
2nd Period 8:27-9:08
3rd Period 9:13-9:54
4th Period 9:59-10:405th Period 10:45-11:35
1 Lunch/1 HR 10:45-11:10
2 Lunch/2HR 11:10-11:35
6th Period 11:40-12:30
3 Lunch/3 HR 1:40-12:05
4 Lunch/4 HR 12:05-12:307th Period 2:35-1:16
8th Period 1:21-2:02Pep Rally Participants
released 2:02-2:10
Pep Rally Release by
Intercom 2:10-2:17
Pep Rally in Gym 2:17-2:47 -
Exams
You may download printable copies of the spring schedules as soon as they become available. We will post EOC, AP, midterm/final exams as soon as they become available.
Centennial High School
Semester Exam PoliciesNo exam may be administered before the scheduled exam day. An exam may be administered after the scheduled exam day with the Principal’s approval. Board policy 4.7001.
· Seniors who have an average of 91 or higher, no unexcused absences per class per semester through Monday, December 14, and have not been suspended, including ISS, are exempt from exams. The 3 points (Honors), 4 points (Dual Credit) and 5 points (AP) will be added to the semester grade prior to notification of the exam exemption. Board policy 4.600.
· All students are expected to be at school all day during the examination schedule. Students who are not present, including students exempt from exams, will be counted as absent.
· A student who does not take a required exam will not receive credit for the course until the exam is taken. Any student who is not exempt and misses an exam will receive an “I” as their exam grade and semester average. The “I” can only be removed when the student takes the exam. The grade will not be changed to “0” at any point unless the student physically sits for the exam and does not correctly answer any test item.
· All students will remain in their classrooms during the entire exam period. No student will be permitted to leave early during an exam period.
Lunch Periods – by zone/area
A: 11:55 – 12:21 – Rooms 226-254
B: 12:24 – 12:49 – Rooms 104-125; 200-225
C: 12:54 – 1:19 – Rooms 128-165/Gym area/
Tuesday, December 15, 2020
1st Period Exam Review 7:40 – 8:10
1st Period Exam 8:10 – 9:40
Break 9:40 – 9:50 C
2nd Period Exam Review 9:50 - 10:20 PAC
2nd Period Exam 10:20 – 11:50
3rd Period Exam Review and Lunch 11:55 – 1:19
4th Period Exam Review 1:24 – 2:47
Wednesday, December 16, 2020
3rd Period Exam Review 7:40 – 8:10
3rd Period Exam 8:10 – 9:40
Break 9:40 – 9:50
4th Period Exam Review 9:50 - 10:20
4th Period Exam 10:20 – 11:50
5/6th Period Exam Reviewand Lunch 11:55 – 1:19
7th Period Exam Review 1:24 – 2:47
Thursday, December 17, 2020
5/6th Period Exam Review 7:40 – 8:10
5/6th Period Exam 8:10 – 9:40
Break 9:40 – 9:50
7th Period Exam Review 9:50 - 10:20
7th Period Exam 10:20 – 11:50
8th Period Exam Review and Lunch 11:55 – 1:19
Make-up Exam or 8th Period Review 1:24 – 2:47
Friday, December 18, 2020
8th Period Exam Review or Make-Up Exam 7:40 – 9:10
Break 9:10 – 9:20
8th period Exam 9:20 – 11:15
Buses Depart 11:20
Late Start Dates
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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.