Semi Finals
Saturday, April 15, 2023 - Ramona High School (Sponsored by Riverside Poly High School), Riverside, Ca
| Group Name | Division | Perform | Staging | Warm Up Time | Warm Up Area |
| Savanna High School Indoor Percussion | SA | 10:00 AM | 9:55 AM | 9:00 AM | A |
| Dana Hills High School Indoor Percussion | SA | 10:12 AM | 10:07 AM | 9:12 AM | A |
| Peninsula High School Indoor Percussion | SA | 10:24 AM | 10:19 AM | 9:24 AM | A |
| Redlands High School Indoor Percussion | SA | 10:36 AM | 10:31 AM | 9:36 AM | A |
| California High School Indoor | SA | 10:48 AM | 10:43 AM | 9:48 AM | A |
| Citrus Hill Indoor Percussion | SA | 11:00 AM | 10:55 AM | 10:00 AM | A |
| La Puente High School Indoor | SA | 11:12 AM | 11:07 AM | 10:12 AM | A |
| BREAK | 11:24 AM | ||||
| John W. North Indoor Percussion | SA | 12:00 PM | 11:55 AM | 11:00 AM | A |
| Classical Academy Indoor Percussion | SA | 12:12 PM | 12:07 PM | 11:12 AM | A |
| Whittier High School Indoor Percussion Ensemble | SA | 12:24 PM | 12:19 PM | 11:24 AM | A |
| La Habra High School Indoor Percussion | SA | 12:36 PM | 12:31 PM | 11:36 AM | A |
| Riverside Poly High School Indoor | SA | 12:48 PM | 12:43 PM | 11:48 AM | A |
| Sultana High School Indoor | SA | 1:00 PM | 12:55 PM | 12:00 PM | A |
| Ontario High School Indoor | SA | 1:12 PM | 1:07 PM | 12:12 PM | A |
| BREAK | 1:24 PM | ||||
| San Marino High School Indoor Percussion | SO | 1:45 PM | 1:40 PM | 12:45 PM | A |
| Ramona High School Indoor Percussion | SO | 1:57 PM | 1:52 PM | 12:57 PM | A |
| LUNCH | 2:09 PM | ||||
| Bishop Amat High School Indoor | SCC | 3:30 PM | 3:25 PM | 2:30 PM | A |
| Murrieta Mesa High School Indoor | SCC | 3:42 PM | 3:37 PM | 2:42 PM | A |
| Santa Fe High School Indoor | SCC | 3:54 PM | 3:49 PM | 2:54 PM | A |
| Colony High School Indoor | SCC | 4:06 PM | 4:01 PM | 3:06 PM | A |
| Temecula Valley High School Golden Valley Regiment Indoor | SCC | 4:18 PM | 4:13 PM | 3:18 PM | A |
| AWARDS | 4:30 PM | ||||