The 2025 season will see the inaugural Women's T20 Blast, running alongside the Men's T20 Blast, with 18 teams competing.
The Women's T20 Blast will start on 29th May and finish on 27th July.
League One will finish on 18th June with League Two finishing on 20th July.
The League Two finals take place on 26th July with the League One final taking place on 27th July.
The Women's T20 Blast is split into two leagues.
League One contains eight teams, who all play each other home and away in a group.
League Two is split into two groups of five, the North Group and the South Group, with all five teams playing each other home and away.
Finals Day will see the top two teams from the League Two's North and South Groups meeting in two semi-finals, with the winner playing in the final.
The following day, the top four teams from League One will meet in two semi-finals, with the winners contesting the final to be crowned champions.
Birmingham Bears
Durham
Essex Eagles
Hampshire Hawks
Lancashire Thunder
Somerset
Surrey
The Blaze
Derbyshire Falcons
Leicestershire Foxes
Northants Steelbacks
Worcestershire Rapids
Yorkshire Vikings
Glamorgan
Gloucestershire
Kent Spitfires
Middlesex
Sussex Sharks