The second edition of the 50-over competition will reach a climax at The County Ground on September 25
Northamptonshire's County Ground will host this year's Rachael Heyhoe Flint Trophy final on September 25.
Last year's inaugural final was held at Edgbaston.
The side finishing top of the eight-team group progresses directly to the final.
A play-off between the sides in second and third, scheduled for September 22, will determine their opponent.
Teams have so far played four matches each, with defending champions Southern Vipers currently leading the way.
The final three rounds will resume from September 10.
It comes after the Charlotte Edwards Cup final was confirmed to take place at The Ageas Bowl on September 5.