| 2011 | Jun 6 | Mon | Classes Begin / Opening Exercises / Orientation for Freshmen |
| Jun 24 | Fri | CLSU Science High School PTA First General Assembly Meeting |
| Jul 15 | Fri | Acquaintance and Induction Party |
| Jul 28- 29 | Thu-Fri | Grubstreet 2011 |
| Jul29, Aug5, Aug12 | Fridays | University Intramurals |
| Aug 2,3,4 | T,W,Th | First Periodical Examination |
| Aug 19 | Fri | Tagisan ng Galing (Buwan ng Wika) |
| Aug 22 | Fri | Last Day for submission of First Grading Grades |
| to be announced | --- | National Career Assessment Examination(NCAE) |
| Sep 9 | Fri | USHS Talents' Show |
| Sep 19 | Mon | Math Day |
| Sep 23 | Fri | Seekers' Science Club Coronation Night |
| Oct 5,6,7 | W,Th,F | 2nd Periodical Examination |
| Oct 24 | Mon | Last Day for submission of 2nd Grading Grades |
| Oct29-Nov6 | Semestral Break | |
| Nov 7 | Mon | Classes Resume |
| Nov 23 | Thu | University Baccalaureate and Tea Party |
| Nov 24 | Thu | University Mid-Year Commencement Exercises |
| Dec 6,7,8 | T,W,Th | Third Periodical Examination |
| Dec 9 | Thu | Charter Annniversary, Science City of Muñoz |
| Dec 14-15 | Th F | Christmas Celebration/Lantern Parade |
| Dec16-Jan2 | Sat | Christmas Break |
| 2012 | ||
| Jan 3 | Tue | Classes Resume |
| Jan 5-6 | T-W | USHS Sports Fest |
| Jan 9 | Fri | Last Day for submission of 3rd Grading Grades |
| Jan 21 | Sat | USHS Entrance Examination |
| Feb 10 | Fri | Juniors-Seniors Promenade |
| Feb 20-24 | M-F | USHS Science Fair and Exhibits |
| Mar 7,8,9 | W-F | 4th Periodical Examination |
| Mar 16 | M | Last day of submission of Fourth Grading Grades |
| Mar 22 | Th | USHS Academic Council |
| Apr 2 | Mon | AM - USHS Baccalaureate Service PM - USHS Tea Party |
| Apr 3 | Thu | USHS Achievement Day |
| Apr 3 | Tue | USHS Promotional, Recognition and Commencement Exercises |
| Apr 10 | tue | University Baccalaureate and Tea Party |
| Apr 11 | Wed | University Annual Commencement Exercises |
| Apr 16-17 | M,T,W | USHS Enrolment for SY 2012-2013 |