Serra Catholic High School's day begins at 8:00 a.m. and concludes at 2:24 p.m. Throughout the day, students attend eight 39 minute classes and have one lunch period.

STANDARD Warning Bell 7:55 Homeroom 8:00 – 8:15 Period 1 8:18 – 8:56 Period 2 8:59 – 9:37 Period 3 9:40– 10:18 Period 4 10:21 – 10:59 Period 5 11:02 – 11:40 Period 6 11:43 – 12:21 Period 7 12:24 – 1:02 Period 8 1:05 – 1:43 Period 9 1:46 – 2:24	MASS Warning Bell 7:55 Homeroom 8:00 – 8:08 Period 1 8:11 – 8:43 Period 2 8:46 – 9:18 Period 3 9:21 – 9:53 Mass 9:56 – 10:54 Period 4 10:57 – 11:29 Period 5 11:32 – 12:04 Period 6 12:07 – 12:39 Period 7 12:42 – 1:14 Period 8 1:17 – 1:49 Period 9 1:52 – 2:24
PM ASSEMBLY Warning Bell 7:55 Homeroom 8:00 – 8:10 Period 1 8:13 – 8:48 Period 2 8:51 – 9:26 Period 3 9:29 – 10:04 Period 4 10:07 – 10:42 Period 5 10:45 – 11:22 Period 6 11:25 – 12:02 Period 7 12:05 – 12:42 Period 8 12:45 – 1:20 Period 9 1:23 – 1:58 Assembly 2:01 – 2:24	AM ACTIVITIES/ADVISORS Warning Bell 7:55 Homeroom 8:00 – 8:08 Activity/ Advisors 8:11 – 8:51 Period 1 8:54 – 9:28 Period 2 9:31 – 10:05 Period 3 10:08 – 10:42 Period 4 10:45 – 11:19 Period 5 11:22 – 11:56 Period 6 11:59 – 12:33 Period 7 12:36 – 1:10 Period 8 1:13 – 1:47 Period 9 1:50 - 2:24
2 HOUR DELAY Warning Bell 9:55 Homeroom 10:00 – 10:09 Period 1 10:12 – 10:36 Period 2 10:39 – 11:03 Period 3 11:06 – 11:30 Period 4 11:33 – 11:57 Period 5 12:00 – 12:28 Period 6 12:31 – 12:59 Period 7 1:02 – 1:30 Period 8 1:33 – 1:57 Period 9 2:00 – 2:24	EXTENDED  HOMEROOM Warning Bell 7:55 Homeroom 8:00 – 8:24 Period 1 8:27 – 9:04 Period 2 9:07 – 9:44 Period 3 9:47 – 10:24 Period 4 10:27 – 11:04 Period 5 11:07 – 11:44 Period 6 11:47 – 12:24 Period 7 12:27 – 1:04 Period 8 1:07 – 1:44 Period 9 1:47 – 2:24