| Event | Date |
|---|---|
| First Round | 1 – 25 September 2026 |
| Girlscamp | 5 – 11 September 2026 |
| Start of the Second Round | 1 October 2026 |
| SOI Workshops | October – November 2026 |
| End of the Second Round | 30 November 2026 |
| SOI Camp | 13 – 20 February 2027 |
| Finals | 3 – 4 April 2027 |
| Team-Selection | 14 – 15 and 28 – 29 May 2027 |
| WEOI in Spain | 25 – 27 June 2027 |
| EGOI in Poland | 5 – 11 July 2027 |
| CEOI in Poland | 30 August – 5 September 2027 |
| IOI in Germany | 12 – 19 September 2027 |