Overview
- Both competitions begin on May 22, with Women's Finals Day at the Kia Oval on July 17 and Men's Finals Day at Edgbaston on July 18.
- The men's event moves to three groups of six with 12 matches per county, with quarter-finals on July 15 for the top two in each group plus the two best third-placed teams.
- The women's format shifts to two tiers of nine, with Tier 1 counties playing 12 matches and the top four advancing to Finals Day, while League 2 plays eight matches before a separate Finals Day at Sophia Gardens on July 12.
- The ECB has scheduled 61 double-headers across the season, including 16 on the opening weekend, to emphasise derby days and support a more balanced calendar.
- Defending champions open at home, with Somerset hosting Hampshire Hawks on May 22 and Surrey Women beginning against Lancashire Thunder during the first-weekend slate.