| Apr 17, 2026 | New Orleans Springs Series 5 |
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| Apr 18-19, 2026 | SEISA Championships |
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| May 7, 2026 | ISSA Board Meeting | |
| May 15-17, 2026 | 2026 ISSA Team Race National Championship (Baker Trophy) |
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| May 30-31, 2026 | 2026 Phebe King Memorial Trophy | |
| May 30-31, 2026 | 2026 ISSA Double-handed Championship (Mallory Trophy) | |
| Full SEISA Calendar & Results | ||
| Apr 10, 2026 | New Orleans Spring Series 4 | |
| Apr 2, 2026 | ISSA Board Meeting | |
| Mar 27, 2026 | New Orleans Spring Series 3 | |
| Mar 21-22, 2026 | Mississippi High School Championships | |
| Mar 21, 2026 | SEISA Girls Champs | |
| Mar 14-15, 2026 | Wet and Cool | |
| Mar 13, 2026 | New Orleans Spring Series 2 | |
| Mar 8, 2026 | Northshore Cup | |
| Mar 6-8, 2026 | Leiter Clinic | |
| Mar 5, 2026 | ISSA Board Meeting | |
| Full SEISA Calendar & Results | ||